Designed for demanding sealing applications in aggressive chemical and high heat environments

The Tecnoflon® family of Fluoroelastomers and Perfluoroelastomers is renowned for its unmatched operational temperature range, chemical resistance, and reliable performance in the most demanding of environments. Unlike traditional elastomeric materials, which are based on Carbon-Hydrogen or Silicon-Oxygen bonds, Tecnoflon® fluoroelastomers derive their uniquely superior properties from strength of the Carbon-Fluorine bond.

Tecnoflon® FKM (fluoroelastomers) and PFR FFKM (perfluoroelastomers) are designed for demanding sealing applications in aggressive chemical and high heat environments such as those found in the Automotive, Aerospace, Oil & Gas, and Energy markets and where high purity, and long service life are essential.

They are compatible with a wide range of fluids and chemicals including automotive lubricants, fuels, and additives. Typical end use products include O-rings, seals, gaskets, and complex molded parts.


Tecnoflon® PFR FFKM

Tecnoflon® PFR FFKM perfluoroelastomers show the ultimate performance among all elastomers. They are resistant to nearly every chemical class with some grades offering heat resistance over 300°C, making Tecnoflon® PFR the material of choice for high demanding sealing applications. Market specific grades have been specially developed to answer the stringent requirements of the semiconductor, oil & gas and chemical processing industries.

Tecnoflon® FKM Base Resistant

Tecnoflon® FKM Base Resistant grades are a special class of peroxide curable grades, designed with improved chemical resistance in Oil & Gas applications with high sour gas concentration, steam, lubricants with amine-based anti-corrosion additives and the latest aggressive automotive gear and axle lubricants.

Tecnoflon® FKM Ionic Curable

Tecnoflon® FKM Ionic Curable grades are copolymers and terpolymers with a fluorine content range from 66% to 70% and are well suited for automotive, industrial and aerospace applications. The HS copolymers are designed for low post-cure cycles and cure-incorporated and rubber-to-metal bonding grades are available for all molding techniques.

Tecnoflon® FKM Peroxide Curable

Tecnoflon® FKM Peroxide Curable grades are the best-in-class chemical resistance grades with a fluorine content range from 67% to 70%. They are designed to produce O-rings, shaft-seals, turbo charger hoses and complex shapes for the automotive and chemical process industry. The peroxide curable grades show excellent processability by injection or compression molding.

Tecnoflon® FKM Peroxide Curable for Low Temperature

Tecnoflon® FKM Low Temperature grades are a wide portfolio including ionic and peroxide curable grades with TR10 range from -19°C to -40°C. They are specially designed for sealing solutions in oil drilling in cold environment as well as in the latest automotive engine technologies, like LPG, CNG and high-performance fuel injection systems.

The VPL Peroxide Curable grades are able to withstand the most stringent specifications for automotive and oil field applications, with TR10 down to -40°C and superior chemical resistance compared to standard low temperature FKM.

What is Tecnoflon®?

Tecnoflon® is the trade name for Solvay Specialty Polymer’s family of fluoroelastomer (FKM) and perfluoroelastomer (FFKM) products. The Tecnoflon® family of products is renowned for its unmatched operational temperature range, chemical resistance, and reliable performance in the most demanding of environments. Unlike traditional elastomeric materials which are based on Carbon-Hydrogen or Silicon-Oxygen bonds Tecnoflon® fluoroelastomers derive their uniquely superior properties from strength of the Carbon-Fluorine bond.

What is the operational service temperature range for Tecnoflon®?

The Tecnoflon® family of products span an operational service temperature range of -50°C to 300°C (-58°F to 572°F) – wider than the range of all other non-fluorinated elastomeric materials. Tecnoflon® VPL sets the standard on low temperature performance with its unique polymer structure imparting successful function to a low of approximately -50°C while Tecnoflon® PFR 95HT, with its proprietary cure system and fully fluorinated polymer backbone, extends high temperature performance to 300°C.

What is Tecnoflon® resistant too?

Acids, bases, solvents, fuels, service oils/lubricants, steam, and much more are no problem. The percent Fluorine content of Tecnoflon® ranges from 64% to 72% by weight depending on the grade selected. Whatever the environment or substance, the Tecnoflon® product family has you covered.

Where is Tecnoflon® used?

Tecnoflon® is used where other elastomers either do not function adequately or simply fail to work. Any application where excellent high temperature, chemical, and environmental resistance is required is a potential candidate for Tecnoflon®. Tecnoflon® offers peace of mind in multiple industrial sectors by preventing leakage in sealing systems, increasing operational longevity through excellent property retention, and reducing the risk of system failures. From automotive, aerospace, oil/gas, chemical processing, and semiconductors to wearable devices and beyond Tecnoflon® is the elastomeric material of choice offering customers unmatched performance, reliability, and satisfaction.

How do I select the right grade of Tecnoflon® for my application?

After reviewing the content on this web page, the right grade may be clear to you, especially when you already know exactly what you are looking for. However, if you aren’t sure which product is right for you or have a more complex scenario, we are here to help. 

In addition to having the most comprehensive product range of any other fluoroelastomer supplier, Tecnoflon® is supported by a global team of Technical Specialists who will work with you to understand your application, conduct testing as needed to find the best possible solution, and provide material support and recommendations tailored to your success. Likewise, Tecnoflon® is also supported by a world class highly talented Research and Innovation team who are always eager to tackle new challenges and develop sustainable solutions to complex problems.

How does Tecnoflon® compare to acrylic elastomers?

Tecnoflon® provides a wider service temperature range exceeding both the low temperature and high temperature properties of acrylics. 

The swell/softening of Tecnoflon® in service fluids is significantly less than that of acrylics leading to improve physical property retention and mechanical robustness in application. 

Unlike acrylics, Tecnoflon® also exhibits excellent water & steam resistance.

How does Tecnoflon® compare to Silicone (VMQ) & Fluorosilicone (FVMQ) elastomers?

VMQ and FVMQ elastomers do offer some improvement in high temperature performance compared to acrylics but Tecnoflon® surpasses all others in its unmatched high temperature capability. 

VMQ is not recommended for use in hydrocarbons while Tecnoflon® is very well suited for use in hydrocarbons. 

FVMQ does offer improved hydrocarbon resistance compared to VMQ but Tecnoflon®, with its naturally higher fluorine content, greatly exceeds the performance of FVMQ in hydrocarbons as well as other polar media with very low swell and significantly reduced fuel permeability. 

Silicone based elastomers are noted for good long term sealing property retention in dry applications. However, Tecnoflon® offers excellent long term sealing property retention both in dry and immersed applications. 

Silicone based elastomers are not well suited for dynamic wear applications (ex: shaft seals) whereas Tecnoflon® offers excellent dynamic wear properties.

How does Tecnoflon® compare to Hydrogenated Nitrile Butadiene Rubber (HNBR) and standard Nitrile (NBR) elastomers?

Both HNBR/NBR elastomers and Tecnoflon® are noted for excellent dynamic wear properties, long term sealing force retention, and robust mechanical properties but only Tecnoflon® extends the operating temperature range by over 100°C beyond HNBR and 150°C beyond NBR. 

Both HNBR and NBR provides either good swell resistance or good low temp flexibility, having both qualities in the same material simply isn’t possible. However, with Tecnoflon® PL and VPL there are no compromises between low temp flexibility, high temperature performance and superior swell resistance.

What is the product form of Tecnoflon®?

While some grades of Tecnoflon® are available as water based latex, the majority of Tecnoflon® is manufactured as opaque off-white solid rubbery polymer sheets.  Depending on the polymer grade it may or may not contain curatives.

How is Tecnoflon® transformed into a ready-for-use use state?

Depending on the application, some customers may choose to work with the water-based latex form or dissolve the solid polymer sheets into a solvent for various liquid application techniques.  

However, for most customers the standard solid polymer form is required as a prerequisite for secondary mixing.  Using traditional rubber mixing technology, compounders mix with the solid Tecnoflon® polymer a variety of fillers, activators, pigments, process aids, and/or curatives to establish the final compound physical & mechanical properties.  

After mixing of the final Tecnoflon® compound, the ratio of polymer to additives ranges from about 95:5 for the softest compounds to near 50:50 for higher hardness compounds. Following mixing, the final Tecnoflon® compound is ready to be formed and “cured” into its’ final state.

What is the composition of Tecnoflon®?

The following information is not intended to serve as a listing of the multiple Tecnoflon® grades available but is simply an overview of the underlying technology. 

Tecnoflon® is a polymer made from a variety of different monomer building blocks.  The types and ratios of those monomers establish the product properties.  The primary monomers used in the manufacture of the various grades of Tecnoflon® are as follows:

Primary Monomers
VDF (VF2) Vinylidene Fluoride CH2=CF2
HFP Hexafluoroproylene CF3-CF=CF2
TFE Tetrafluoroethylene CF2=CF2
PAVE Perfluoromethyl vinyl ether CF3-O-CF=CF2
ETH Ethylene CH2=CH2
MOVE Perfluoromethoxyvinyl ethers CF3-(O-CF2-O)n-CF=CF2

ASTM D1418 provides a basic framework for defining most of the Tecnoflon® fluoroelastomer grades as follows:

ASTM D1418 Framework
FKM - Fluoroelastomers
Type 1 Dipolymer of HFP & VDF Tecnoflon® N & FOR-xxx
Type 2 Terpolymer of TFE, HFP, & VDF Tecnoflon® P, T & FOR-xxx
Type 3 Terpolymer of TFE, a fluorinated vinyl ether (e.g. PMVE and/or MOVE), and VDF Tecnoflon® PL & VPL
Type 4 Terpolymer of TFE, Propylene, & VDF Pentapolymer of TFE, HFP, VDF, ethylene, and PMVE Tecnoflon® BR 9151
PFR FFKM - Perfluoroelastomers
Pefluorinated rubbers of polymethylene type having all fluoro, perfluoroalkyl, or perfluoroalkoxy substituent groups on the polymer chain. (e.g. TFE & PMVE) Tecnoflon® PFR, PFR-HT, PFR-LT
How is Tecnoflon® cured?

Tecnoflon® fluoroelastomers and perfluoroelastomers belong to the thermoset family of materials. At room temperature they are above their glass transition temperatures and, as a result, exhibit semi-fluid like behavior. They must be compounded and chemically cross-linked (also known as cured) in order to develop to their full physical property potential. Tecnoflon® is cross-linked by one of two primary types of cure systems:

  • Ionic (also known as Bisphenol) cure system: The ionic cure system relies on the in-situ dehydrofluorination of the polymer backbone and subsequent formation of crosslinks by a difunctional monomer such as 4,4′-(Hexafluoroisopropylidene)diphenol (also known as Bisphenol AF). Most customers prefer to leave the job of adding the ionic cure system to Solvay. We offer numerous cure incorporated dipolymer (type 1) and terpolymer (type 2) grades. These grades known as FOR (formulated) grades are available in varying fluorine contents, viscosities, cure speeds, and cure states. However, some customers prefer to start with the base gum and add the curatives as part of their mixing procedures. We also have available stand-alone curatives that can be used in this manner. Either way, we provide the support necessary to help you be successful. 
     
  • Peroxide cure system: Peroxide cured fluoroelastomers contain special Halogen based cure site monomers polymerized directly into the polymer matrix. The peroxide cure system utilizes an organic peroxide to initiate a free radical reaction leading to the crosslinking of the cure site monomers with co-agents such as Triallyl isocyanurate (TAIC). Solvay produces peroxide cured versions of all ASTM D1418 FKM and FFKM polymer types in multiple fluorine contents, monomer ratios, and viscosities. However, given the inherent sensitivity of the peroxide system Solvay does not offer formulated peroxide cure containing grades. The addition of both peroxide and co-agent is common practice by compounders experienced in working with Tecnoflon®.

Regardless of the cure system utilized both require application of heat, time, under pressure. Typical press curing time/temperatures range from 160°C to 180°C for 3 to 6 minutes.

Are any grades of Tecnoflon® compliant with FDA regulation 21 CFR 177.2600?

Yes, Solvay has a variety of grades that are FDA compliant. Please contact a Specialty Polymers expert for assistance in making your selection.

What is Tecnoflon® VPL?

Tecnoflon® VPL is Solvay’s newest and most innovative fluoroelastomer product family. It extends the traditional boundaries of low temperature flexibility, swell resistance, and aggressive chemical compatibility beyond where other fluoroelastomers can go.  

Before Tecnoflon® VPL, the lowest TR-10 offered by any fluoroelastomer was -30°C. Tecnoflon® VPL currently offers products with TR-10 values down to -45°C with effective sealing to -50°C. Tecnoflon® VPL was initially developed to meet the demands of higher operating pressures and increased exposure to alcohol fuel blends and bio-fuels in automotive fuel delivery systems.  Tecnoflon® VPL products are now expanding and growing in multiple markets from automotive fuel, engine, and driveline seals to oil & gas, and aerospace.  

Design engineers no longer have to compromise on elastomer performance to enjoy service temp ranges extending below -30°C. Silicone, Fluorosilicone, and HNBR were once the only elastomer alternatives for ultra-low temp sealing. Selecting one of these materials required accommodating higher swell and/or a loss of upper temperature performance. With a service temperature range of -50°C to 250°C and impeccable resistance to aggressive fluids and fuels you can have it all with Tecnoflon® VPL.

High-Performance Seals for Critical Applications

Tecnoflon® fluorelastomers and perfluorolastomers provide exceptional resistance to chemicals, acids, steam, hydrogen sulfide and flex fuels, making them ideal for the harsh environments found in Automotive, Oil & Gas, Energy and Semicon Industries.

Oil & Gas Downhole & Offshore E&P

The harsh environments of the Oil & Gas industry demand elastomers capable of extreme temperature and chemical resistance. The Tecnoflon® family of fluoroelastomers offers a variety of grades tough enough to withstand the rigors of downhole and subsea challenges.

Grade Key Features

Tecnoflon® Bisphenol Curable

  • Good resistance to heat and hydrocarbons
  • Outstanding compression set resistance
  • Good Rapid Gas Decompression (RGD) resistance

Tecnoflon® Peroxide Curable

  • Improved chemical resistance
  • High temperature steam resistance
  • Excellent resistance to sour gases (H2S mixtures)
  • Outstanding RGD resistance

Tecnoflon® Peroxide Curable for Low Temperature

  • Extended low temperature service
  • High temperature steam resistance
  • Excellent resistance to sour gases (H2S mixtures)
  • Outstanding RGD resistance

Tecnoflon® Base Resistant

  • Excellent resistance to bases, amines, steam, hydrocarbons and sour gases

Tecnoflon® PFR FFKM

The ultimate choice for chemical and thermal performance

  • Resistance to nearly every chemical class
  • Some grades offering heat resistance up to 300°C
  • Good RGD resistance

Automotive Fuel Systems

Tecnoflon® fluoroelastomers offer resistance to the most aggressive fuel mixtures while providing excellent properties for the lowest permeation. Tecnoflon® FKM grades have been designed to cover a broad operating temperature range: -40°C to +250°C. Applications include O-rings, fuel line quick-connect seals, fuel sender unit seals, fuel host connectors and fuel cap seals.

Fuel Cell Stack Sealing

Tecnoflon® FKM is the ideal material for fuel cell stack sealing with high softness thanks to its outstanding properties:

  • Extreme chemical resistance
  • High temperature rating (up to 250°C) – a mandatory choice where conventional rubbers reach their limits (temperature over 100-120°C)
  • Low gas permeability

Where necessary, high purity fluoroelastomers (organic filled) are also available.

Solar Energy Photovoltaic Module Manufacturing

Critical sealing made from Tecnoflon® FKM and FFKM ensure process reliability and long service life.

Wind Power Gear Drives

Tecnoflon® FKM and FFKM are designed for demanding sealing applications in aggressive chemical and high heat environments. They are compatible with a wide range of fluids, lubricants and chemicals. Their unique properties make them the best choice for the production of high performance gear drives seals.

Semiconductor Manufacturing

Critical sealing made from Tecnoflon® FKM and FFKM ensure process reliability and long service life for wafer processing equipment.

Performance Data

Chemical Resistance in Flex Fluids

Fluid Testing in Ethanol Blends (70 hrs @ 60°C)

Tecnoflon-flex-fuel-resistance-in-ethanol

Fluid Testing at Methanol Blends (168 hrs @ 23°C / 40°C)

Tecnoflon-flex-fuel-resistance-in-methanol

Fluid Testing in Biodiesel (336 hrs @ 150°C)

Tecnoflon-flex-fuel-resistance-in-biodiesel

 

Resistance to Hydrogen Sulphide

Tecnoflon® FKM Peroxide Curable 
Temperature Effect on P 959 in H2S 64% - EB Change

Tecnoflon-temperature-effect-on-P-959-in-H2S

Tecnoflon® FKM Bisphenol Curable 
Temperature Effect on FOR 5381 in H2S 64% - EB Change

Tecnoflon-temperature-effect-on-FOR-5381-in-H2S
Rapid Gas Decompression
Property Unit Tecnoflon® 
P757
Tecnoflon® 
PFR 06HC
Material type   Type 2 FKM, 
PO cured
FFKM, PO cured
TR10 °C -15 -
Compound   - -
Hardness (Shore A)   90 90
M50%   7.6 9.0
M100%   14.1 18.4
Tensile strength MPa 22.5 20.1
Elongation at break % 150 118
Norsok Rating   0000, 0000, 0000, 0000 0000, 0000, 1000, 0000
Chemical Resistance

VPL 85540 in Norsok Fluid and Methanol (After 70hrs @ 23°C)

Tecnoflon-chemical-resistance-in-Norsok-fluid-and-methanol

 

Norsok Fluid: Heptane/20% Cyclohexane/10% Toluene

 

Chemical Resistance in Hydrocarbon Blends and Methanol (168 hrs @ 23°C)

Tecnoflon-chemical-resistance-in-hydrocarbon-blends-and-methanol-23C

 

Fuel C: Mixture 50-50% of Iso-Octane and Toluene 
M15: Mixture 85-15% of Fuel C and Methanol

 

Chemical Resistance in Hydrocarbon Blends and Methanol (336 hrs @ 60°C)

Tecnoflon-chemical-resistance-in-hydrocarbon-blends-and-methanol-60C

VPL 85540 vs Other Elastomers - Change in Durometer 
After Aging in Fluids (70 hrs @23°C)

Tecnoflon-change-in-durometer-after-aging-in-fluids

 

Acid Resistance

Organic Acid Resistance 
10% Formic Acid, 10% Acetic Acid, 80% Dl Water (336 hrs @ 121°C)

Tecnoflon-organic-acid-resistance

Acid Resistance 
98% H2SO4 (70hrs @ 150°C)

Tecnoflon-acid-resistance-in-H2SO4

 

Steam Resistance

Steam Resistance (169% @ 200°C)

Tecnoflon-steam-resistance

 

Tecnoflon® PFR FFKM perfluoroelastomers show the ultimate performance among all elastomers. They are resistant to nearly every chemical class with some grades offering heat resistance over 300°C, making Tecnoflon® PFR the material of choice for high demanding sealing applications. Market specific grades have been specially developed to answer the stringent requirements of the semiconductor, oil & gas and chemical processing industries.

Tecnoflon® PFR FFKM cover the widest temperature range among all elastomers.

Elastomer Service Temperatures

Tecnoflon-service-temperature-range

Tecnoflon® PFR FFKM show the best-in-class chemical resistance among all elastomers, and will only be affected by fluorinated fluids.

Chemical resistance

Chemical HNBR VMQ FVMQ FKM FEPM 
(TFE/P)
Tecnoflon®
PFR FFKM
Inorganic acids C C C B A A
Organic acids B B D C C A
Alkalis B B B B A A
Amines A A D D A A
Steam C B C C A A
Ketones D C D D D A
Esters D B D D D A
Ethers A A A D D A
Aldehydes D B D D D A
Alcohols A A A B A A
Aliphatic Hydrocarbons A D A A B A
Aromatic Hydrocarbons D D C A D A
Sour gas C C C B A A
Lubricants A A A A A A
Fluorinated fluids A D C D D C

A = <10% volume swelling 
B = 10-30% volume swelling 
C = 30-50% volume swelling 
D = >50% volume swelling

Tecnoflon® PFR FFKM Grades

Chemical Resistant Grades

Tecnoflon® PFR 94 & Tecnoflon® PFR 06HC

Tecnoflon® PFR 94 and PFR 06HC have been specially designed for the Chemical Process and Oil & Gas industries, delivering the highest chemical resistance among all elastomers; specifically they outperform FKMs when in contact with polar fluids (such as ketones, esters, ethers and aldehydes) and bases (alkalis and amines).

Chemical Resistance in Ketones

Tecnoflon-chemical-resistance-in-ketones

 

Chemical Resistance in Amines

Tecnoflon-chemical-resistance-in-amines

 

High Temperature Resistant Grades

Tecnoflon® PFR 95 & Tecnoflon® PFR 95HT

With Solvay’s proprietary cross-linking technology, Tecnoflon® PFR 95 and PFR 95HT provide superior thermal resistance versus general purpose FFKM, maintaining their sealing properties at high temperatures and outperforming other high temperature cross-linking technologies under steam at high temperatures.

Compression Set Variation at High Temperatures

Tecnoflon-compression-set-at-high-temperature

 

Steam Resistance

Tecnoflon_ThermalResistance

 

High Purity Grades

Tecnoflon® PFR 5910M & Tecnoflon® PFR 5920M

Tecnoflon® PFR 5910M and PFR 5920M have been specially designed for the semiconductor industry to eliminate the use of mineral fillers, avoiding particle generation in the chambers using aggressive plasma conditions. Solvay’s co-coagulation proprietary technology allows the introduction of PTFE particles smaller than 40nm and ensures an excellent dispersion of those particles, resulting in equivalent mechanical properties to mineral filled perfluoroelastomers and better than other organic filled materials available in this market.

Low Particle Generation

Zero residual mass after TGA in nitrogen indicates that the material is fully organic, greatly reducing the chances of generating particles in the plasma chambers.

TGA in Nitrogen Comparison

Tecnoflon-TGA-in-nitrogen

Comparison of Organic Filled FFKMs – SEM Images

Solvay Proprietary Technology

Tecnoflon_SEM_Nano-PTFE

 


Extrusion Blending Technology

Tecnoflon_SEM_Extrusion

 


Open Mill Mixing Technology

Tecnoflon_SEM_OpenMill

 

With Solvay co-coagulation proprietary technology, PTFE particles are observable with far greater difficulty, even by SEM, thanks to excellent sub-micron size dispersion. This technology achieves mechanical properties equivalent to those of mineral-filled perfluoroelastomer compounds.

Typical Metal Content

Solvay technology allows to obtain the the highest purity among commercial sealing solutions in the semicon market


Bulk Ash Analysis

Tecnoflon-bulk-ash-analysis

 

Tecnoflon® PFR 5910M: Solvay Technology 
FFKM 1: Amber translucent organic filled FFKM 
FFKM 2: Black FFKM for semiconductor wet processing 
FKM 1: High-performance FKM for plasma dry processes

 

Mechanical Properties Comparison

The excellent PTFE dispersion at the nanoscale allows to attain physical properties which are similar to conventional mineral filled compounds and better than traditional PTFE powder mixing.


Tensile Strength Comparison

Tecnoflon_Nano-PTFE_TensileStrength

 

Compression Set Comparison
 

Nano-PTFE-compression-set

 

Low Temperature Resistant Grades

Tecnoflon® PFR LT is specially developed to match the latest and most stringent requirements of the Oil & Gas industry.

Solvay's proprietary MOVE technology delivers a perfluoroelastomer with outstanding chemical resistance and unrivaled extended low temperature flexibility with TR10=-30°C.

Minimum Service Temperature

Tecnoflon-minimum-service-temperature

 

Rapid Gas Decompression (RGD) occurs when external gas pressure rapidly reduces in operation; this may result in splitting, internal cracking and blistering of the seals.

Thanks to Solvay’s proprietary Branching and Pseudo-living technology, Tecnoflon® PFR possess excellent properties to withstand Rapid Gas Decompression.

Tecnoflon® PFR LT, along with most Tecnoflon® PFR FFKM, has been tested according the Industry recognized NORSOK Standard M-710 Rev 2, and successfully passed the RGD test.

Tecnoflon_LT-RDGTest

 

RGD test conditions 

Gas: 90/10 mol% CH4/CO2 
O-rings per material: 6 
Groove fill, %: 65 and 80 
Temperature: 100°C 
Pressure: 150 bar 
No. of cycles: 10 
First cycle duration: 72 hours 
Cycles 2-10, duration: 23-24 hours 
Hold period between cycles: 1 hour 
De-pressurization rate: 20 bar/minute 
Sampling after cycles: 10

NORSOK M-710, “Qualification of non-metallic sealing materials and manufacturers”, Rev 2, October 2001

 

Processing Recommendations

All Tecnoflon® PFR are peroxide curable materials; thanks to Solvay Specialty Polymers proprietary polymerization technology, this translates into very easy process ability, from compound mixing, to preforming, molding and post-curing.

  • Easy compounding with two-roll mills; no exotic chemicals are needed
  • Very simple preforming, preferably by screw extruders
  • Short curing cycles at relatively low temperatures (from 150 to 180°C)
  • Relatively short post-curing cycles in air circulating oven (max 24 h)

Tecnoflon® PFR behave similarly to peroxide cured fluoroelastomers, in terms of ingredients used for compounding, processing conditions as well as shrinking rates. This means that standard process equipment (open mills, presses, tools and ovens) for FKMs is suitable to Tecnoflon® PFR seals manufacturing too.

Compounding

Tecnoflon® PFR perfluoroelastomers are best suited for two-roll mills mixing. The elastomer must be at first pre-heated by loading it onto the open mill with a wide enough gap between the rollers and progressively reducing the gap. Once the rubber has covered most of the roller width, sticking on the fast cylinder, the ingredients, previously mixed, are progressively added, taking care to distribute them along the whole length of the rollers.

After the incorporation and the preliminary dispersion of the ingredients, the compound is completed by working with a reduced gap aiming at dispersing completely and homogenizing the ingredients. In this phase, the technician operates 6 cuts of the compound in diagonal up to ¾ of the length of the cylinder, alternatively from the left to right and vice versa. After that, the compound is discharged.

Tecnoflon® PFR compounds can be readily processed by means of conventional elastomer processing methods such as compression, transfer and injection molding. Alternatively they can be extruded into hoses or profiles and subsequently cured in an autoclave.

Preforming (by extrusion)

When processing Tecnoflon® PFR by means of compression molding into seals, pre-forming (i.e. the shaping of the uncured compound in the form of a cord) is recommended. This optimizes the manufacturing process as well as enhances the seal performance. Additionally accurate compound pre-forming reduces the amount of flash, resulting in less process waste and improved efficiency. It is recommended to carry out the pre-forming by means of conventional elastomer screw extruders with L/D ratio falling in the range between 6 and 12. Ram extruders can be used for the same purpose but, due to their different layout, they’re less efficient than screw extruders in keeping a smooth and constant size extrudate.

Extrusion parameters must be fine tuned according to the compound properties and the apparatus design; as starting point, 50°C for the barrel and 70°C for the die are recommended. The operating conditions, when set properly, will results in a smooth and constant profile. Particular care must be taken to prevent excessive heat buildup in the compound which will result in scorching.

Molding

Vulcanization of the compounds is most commonly carried out in compression moulding presses. The process conditions depend on the compound, the press and the tool design as well as on the item geometry. However PFR 94 and PFR 06HC based compounds can be effectively moulded at 160°C, while 175 °C is the optimal curing temperature for PFR 95, PFR 95HT, PFR 5910M and PFR 5920M compounds. The curing time depends mainly on the items size and geometry, for instance the larger the cross-section, the longer the curing time.

Post Cure

Post cure step is needed for all FFKMs in order to complete the cure, eliminate impurities and strengthen filler-polymer interactions. Post cure parameters are related to the oven type. Therefore optimal conditions must be tuned to the system in use. As starting point for the optimization, the following are recommended when ovens with 7 to 14 complete air changes per hour are used:

  • PFR 94 and PFR 06HC: 4 h @ 230°C
  • PFR 95 and white PFR 95HT: 8 hours rise from RT to 250°C followed by 16 hours at 250°C
  • Black PFR 95HT: 8 hours rise from RT to 290°C followed by 16 hours at 290°C
  • Translucent PFR 5910M and PFR 5920M: 8 h @ 230°C

For higher number of air changes (i.e. > 50 per hour), milder conditions (i.e. lower temperatures and/or shorter times) are advisable.

Tecnoflon® FKM Base Resistant

Tecnoflon® FKM Base Resistant grades are a special class of peroxide curable grades, designed with improved chemical resistance in oil & Gas applications with high sour gas concentration, steam, lubricants with amine-based anti-corrosion additives and the latest aggressive automotive gear and axle lubricants.

Improved chemical resistance

The base resistant FKMs from Solvay are widely used for shaft seals, valve stem seals, O-rings, gaskets and other sealing items exposed to basic chemical environments.

Tensile Strength Change – ASTM 105 G

Tecnoflon-tensile-strength

 

Tensile Strength Change – Dexron VI

Tecnoflon-tensile-strength-Dexron-VI


Tensile Strength Change ­ GL­5

Tecnoflon-tensile-strength-GL-5

 

Tecnoflon® FKM Ionic Curable

Tecnoflon® FKM Ionic Curable grades are copolymers and terpolymers with a fluorine content range from 66% to 70% and are well suited for automotive, industrial and aerospace applications. The HS copolymers are designed for low post-cure cycles and cure-incorporated and rubber-to-metal bonding grades are available for all molding techniques.

Copolymers & Terpolymers

Tecnoflon® FKM copolymers are based on vinylidene fluoride and hexafluoropropylene with fluorine content of 66%. There are two types of copolymers: cure incorporated and non-cure incorporated (gumstock).  

Tecnoflon® FKM ionic curable terpolymers are based on vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene with fluorine content between 68% to 70%. There are two types of terpolymers: cure incorporated and non-cure incorporated (gumstock).


Fluoroelastomers Fluorine Content [%]

Tecnoflon-fluorine-content-in-methanol


Thermal Rating

Tecnoflon-thermal-rate

 

Tecnoflon® FOR grades selection chart

Tecnoflon-FOR-grades-selection-chart

 

 

 

Processing

Readily processable: Tecnoflon® Ionic Curable FKMs can be processed by conventional rubber processing methods.

Compression Molding: Compression molding is the oldest and most common form of molding of FKMs.

Transfer Molding: A medium viscosity polymer is recommended. A careful consideration of cure rate is important to ensure scorch safety.

Injection Molding: Injection molding is the most demanding molding process. The injection molding grade selected should have a molecular weight distribution to achieve the best flow and good scorch safety with a very steep cure rate. Molding fouling must be minimized by using formulations minimizing process aids and metal oxides.

Extrusion: Extrusion of FKMs is used to form extruded shapes, tubing, O-ring cord, and compression molding pre-forms.

Typical Properties

Base Copolymers
Property N 215/U N 535 N 935 NH N 60HS N 90HS
Mooney Visc. (1+10) at 121°C (MU) 
ASTM D1646
10 27 45 62 27 45
Tensile Strength (MPa) 
ASTM D412C
14.5 17.5 18.5 19.5 16.0 15.0
Elongation at Break (%) 
ASTM D412C
190 185 170 190 220 190
Hardness (Shore A) 
ASTM 2240
73 74 76 75 69 70
Compression set, 70h at 200°C on #214 O-Ring (%) 
ASTM D395, Method B
22 14 16 13 13 14
TR10 (°C) 
ASTM D1329
-17 -17 -17 -17 -17 -17
Compliance   FDA* FDA* FDA* FDA* FDA*

* With compliant curatives only

Cure incorporated Copolymers
Property FOR 210 FOR 335 FOR 539 FOR 4353 FOR 5351 FOR 60K/U FOR 5312K FOR 7353
Mooney viscosity (MU)
(1+10) at 121°C
10 20 20 20 24 31 42 38
Cure rate Slow Slow Medium Medium Fast Slow Medium Fast
Tensile strength (MPa) 
ASTM D412C
15.0 17.0 16.5 15.5 16.0 17.5 17.5 18.0
Elongation at break (%) 
ASTM D412C
185 170 190 175 250 225 225 180
Hardness (Shore A) 
ASTM 2240
74 76 76 76 72 72 74 78
Compression set, 70h at 200°C on #214 O-Ring (%) 
ASTM D395, Method B
22 16 18 15 18 18 18 16
TR10 (°C) 
ASTM D1329
-17 -17 -17 -17 -17 -17 -17 -17
Compliance       FDA       FDA

 

HS Grades

Property FOR 501HS FOR 50HS FOR 801HS FOR 80HS FOR 900HS
Mooney viscosity (MU) 
(1+10) at 121°C
23 23 40 38 53
Cure rate          
Tensile strength (MPa) 
ASTM D412C
15.0 18.0 17.5 18.0 16.5
Elongation at break (%) 
ASTM D412C
270 230 260 200 305
Hardness (Shore A) 
ASTM 2240
69 70 65 71 69
Compression set, 70h at 200°C on #214 O-Ring (%) 
ASTM D395, Method B
17 13 17 13 16
TR10 (°C) 
ASTM D1329
-17 -17 -17 -17 -17
Base Terpolymers
Property TN 50A TN T 538 T 938
Fluorine content (Weight %) 68.0 68.0 68.5 68.5
Specific gravity (g/cm3) 
ASTM D792
1.86 1.86 1.88 1.88
Mooney viscosity (MU) 
(1+10) at 121°C
23 67 26 66
Tensile strength (MPa) 
ASTM D412C
13.5 18.0 12.0 15.5
Elongation at break (%) 
ASTM D412C
300 230 250 220
Hardness (Shore A) 
ASTM 2240
72 77 75 78
Compression set, 70h at 200°C on #214 O-Ring (%) 
ASTM D395, Method B
29 29 31 24
TR10 (°C) 
ASTM D1329
-14 -14 -13 -13
Compliance   FDA*   FDA*

 * With compliant curatives only

Cure Incorporated Terpolymers
Property FOR 7380K FOR 5381 FOR 9385F FOR 9383 FOR 4391
Fluorine content (Weight %) 68.0 68.5 68.5 68.5 70
Specific gravity (g/cm3) 
ASTM D792
1.86 1.88 1.88 1.88 1.89
Mooney viscosity (MU) 
(1+10) at 121°C
31 21 45 60 49
Cure rate Medium Fast Fast Medium Fast
Tensile strength (MPa) 
ASTM D412C
16.0 15.0 11.5 17.0 16.0
Elongation at break (%) 
ASTM D412C
250 200 350 285 240
Hardness (Shore A) 
ASTM 2240
75 80 75 74 78
Compression set, 70h at 200°C on #214 O-Ring (%) 
ASTM D395, Method B
30 23 40 32 32
TR10 (°C) 
ASTM D1329
-14 -13 -13 -13 -7
Bisphenol-Curable Low Temperature Terpolymers
Property T 636/L T636 FOR 5361* FOR 636A* FOR TF636*
Mooney viscosity (MU) 
(1+10) at 121°C
22 34 21 30 31
Cure rate     Fast Medium Fast
Tensile strength (MPa) 
ASTM D412C
17.5 18.5 18.0 20.0 18.5
Elongation at break (%) 
ASTM D412C
190 190 175 175 165
Hardness (Shore A) 
ASTM 2240
73 74 74 74 76
Compression set, 70h at 200°C on #214 O-Ring (%) 
ASTM D395, Method B
15 13 17 16 13
TR10 (°C) 
ASTM D1329
-19 -19 -19 -19 -19

* Cure incorporated 

Tecnoflon® FKM Peroxide Curable grades are the best-in-class chemical resistance grades with a fluorine content range from 67% to 70%. They are designed to produce O-rings, shaft-seals, turbo charger hoses and complex shapes for the automotive and chemical process industry. The peroxide curable grades show excellent processability by injection or compression molding.

Tecnoflon® Peroxide Curable fluoroelastomers exhibit superior resistance to a wide variety of chemicals coupled with excellent processability, optimum compression set and good flexibility at low temperatures. 

Tecnoflon® grades P 757-P 959 (n.127) are FDA compliant (vol.21 - §177.2600).

Key features

  • Low post cure
  • Superior mold flow
  • Lack of mold fouling
  • Excellent mold release
  • Good metal bonding

 

Sealing Force

Tecnoflon-sealing-force

Chemical Resistance

Tecnoflon-chemical-resistance

 

Tecnoflon® FKM Low Temperature grades are a wide portfolio including ionic and peroxide curable grades with TR10 range from -19°C to -40°C. They are specially designed for sealing solutions in oil drilling in cold environment as well as in the latest automotive engine technologies, like LPG, CNG and high-performance fuel injection systems.

The VPL Peroxide Curable grades are able to withstand the most stringent specifications for automotive and oil field applications, with TR10 down to -40°C and superior chemical resistance compared to standard low temperature FKM. 


Broad range of temperatures with no sacrifice in performance.

Tecnoflon® Low Temperature FKMs (VPL series) are designed for demanding sealing applications where they face temperatures as low as -40°C and aggressive chemicals found in Automotive, Oil & Gas and Aerospace environments.

Volume Swell in M15 [168H @23 °C]

Tecnoflon-volume-swell-in-M15

 

Processing

Readily processable: Tecnoflon® Low Temperature FKMs may be handled by traditional rubber processing methods.

Compression Molding: Compression molding is the oldest and most common form of molding of FKMs.

Transfer Molding: A medium viscosity polymer is recommended. A careful consideration of cure rate is important to ensure scorch safety.

Injection Molding: Injection molding is the most demanding molding process. The injection molding grade selected should have a molecular weight distribution to achieve the best flow and good scorch safety with a very steep cure rate. Molding fouling must be minimized by using formulations minimizing process aids and metal oxides.

Extrusion: Extrusion of FKMs is used to form extruded shapes, tubing, O-ring cord, and compression molding pre-forms.

Typical Properties

Low Temperature Bisphenol Curable
T 636 T 636/L L 636 FOR TF 636 FOR 5361
Flourine Content (weight %) 65.5 65.5 66 65.5 65.5
Specific Gravity (g/cm3) 
ASTM D792
1.81 1.81 1.83 1.81 1.81
Rubber Mooney Visc. ML(1+10) @ 121°C (Units) 
ASTM D1646
34 22 35 31 21
Tensile Strength (MPa) 
ASTM D412C
18.5 17.5 17.3 18.4 17.8
Elongation at Break (%) 
ASTM D412C
187 187 187 165 175
Hardness (Shore A) 
ASTM 2240
74 73 73 76 74
C.Set 70h @200°C on #214 O-Ring (%) 
ASTM D395 
Method B
13 15 16 13 17
TR10 (°C) 
ASTM D1329
-19 -19 -21 -19 -19
Post Cure (8+16)h @ 250°C (8+16)h @ 250°C (8+16)h @ 250°C (8+16)h @ 250°C (8+16)h @ 250°C
Notes       1) 1)

 1) Cure incorporated

Low Temperature Peroxide Curable
  PL 458 PL 958 PL 557 PL 455 PL 855
Flourine Content (weight %) 66 66 65.5 64 64
Specific Gravity (g/cm3) ASTM D792 1.83 1.83 1.81 1.78 1.78
Rubber Mooney Visc. ML(1+10) @ 121°C (Units) 
ASTM D1646
29 53 35 19 54
Tensile Strength (MPa) 
ASTM D412C
20.8 20.4 19.5 21.3 20.8
Elongation at Break (%) 
ASTM D412C
182 192 210 227 248
Hardness (Shore A) 
ASTM 2240
73 72 71 70 69
C.Set 70h @200°C on #214 O-Ring (%) 
ASTM D395 
Method B
18 18 21 23 23
TR10 (°C) 
ASTM D1329
-24 -24 -29 -30 -30
Post Cure 4h @ 230°C 4h @ 230°C 4h @ 230°C 4h @ 230°C 4h @ 230°C
Notes 2) 2) 2) 2) 2)

1) Cure incorporated 
2) Low post-cure

Peroxide-Curable Extreme Low-Temperature

Compound recipe: 1P

Property Unit VPL 45730 VPL 85730 VPL 45535 VPL 55540 VPL 85540 VPL 75545 Test Method
Flourine Content Weight % 67 67 65 65 65 65  
Specific Gravity g/cm3 1.87 1.87 1.85 1.83 1.83 1.83 ASTM D792
Mooney viscosity 
(1+10) at 121°C
MU 25 45 25 25 45 32 ASTM D1646
Tensile Strength MPa 19.3 18.8 14.6 15.0 15.8 14.0 ASTM D412C
Elongation at Break % 176 187 166 172 174 200 ASTM D412C
Hardness Shore A 74 72 68 68 67 62 ASTM 2240
Compression set, 
70h at 200°C on 
#214 O-ring
% 19 22 20 21 20 22 ASTM D395 
Method B
TR10 °C -30 -30 -35 -40 -40 -45 ASTM D1329