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