Very Low Creep

The creep resistance of Ixef® compounds is superior to that of most engineering polymers with similar glass fiber content. Deformation of Ixef® 1032 is less than 1% after 1,000 hours under 50 MPa of pressure at 50°C (122°F).

 

Creep Resistance at Elevated Temperatures

Ixef_CreepResistance

Good Dimensional Stability

The coefficient of linear thermal expansion (CLTE) of Ixef® compounds is similar to that of many cast metals and alloys at ambient temperatures. Low mold shrinkage and the ability to maintain tight tolerances (as little as ± 0.05% length tolerances when properly molded) allow for high reproducibility.

Coefficient of Linear Thermal Expansion of Ixef® Resin
Ixef® 1022 1.5 10-5K-1 (Flow direction)
Ixef® 1022 3.6 10-5K-1 (Transverse direction)
Steel 1.2 10-5K-1
Aluminum 2.4 10-5K-1
Brass 1.8 10-5K-1
Zinc 3 10-5K-1
Low and Slow Rate of Water Absorption

Ixef® PARA’s highly aromatic structure results in lower and slower water absorption than typical polyamides, which are highly sensitive to humidity. Water absorption for Ixef® 1022 (50% glass fiber) is only 0.16% after 24 hours of water immersion at room temperature.

 

Moisture Absorption, 24h at 23 °C

Ixef_MoistureAbsorption

Good Chemical Resistance

Ixef® compounds are highly resistant to aqueous solutions of wide range of chemicals and cleaning fluids as well as to common solvents, such as:

  • Aliphatic hydrocarbons
  • Aromatic hydrocarbons
  • Chlorinated solvents
  • Ketones
  • Esters
  • Ethers
  • Glycols

Testing also shows good resistance to standard engine oil (Type SAE 10W30) after 2,000 hours at 120°C (248°F) and to automotive fuels after 2,000 hours at 40°C (104°F).

Ease of Processing

Ixef® resin offers good injectability even for grades with high glass fiber content – ideal for molding complex or thin-walled parts. Immediately below the smooth outer surface, glass fibers orient in the flow direction, while at the core, fiber orientation becomes random. The result is a strong polymer with a beautiful, smooth finish.

Recommendations for Processing

Processing Temperatures
Cylinder Temperature
Feed zone 250 - 280°C
Compression zone 250 - 280°C
Metering zone or homogenization zone 250 - 280°C
Nozzle 260 - 290°C
Hot runners (when used) 250 - 260°C
Temperature of the Melt (measured on purged material)
Standard grades (eg. Ixef® 1022, 2030) 280°C
Impact modified (eg. Ixef® 1622) and flame retardant grades (eg. Ixef® 1521, 1524) <270°C
Mold Temperature
Mold Temperature 120 - 140°C
Plasticizing
Screw Speed, peripheral(1) 3-10 m/min
Back Pressure 0-10 bar
Injection
Injection Speed High
Injection Pressure 500-1500 bar (material)
Hold and Cooling
Hold Pressure 500-1500 bar (material)
Hold time(sec) 3w (2)
Cooling time, including hold time(sec) 2.5w2 (3)

(1)for screw diameter 25-50 mm 
(2)w = wall thickness in mm 
(3)w = wall thickness in mm, > 2mm

Mold Temperature

It is essential that the mold temperature be 120°C to 140°C to achieve maximum crystallinity. This will assure:

  • Good surface finish
  • Good dimensional stability
  • Full mechanical properties
  • Low moisture absorption