Fluoropolymers / Alfa Chemistry

FEP with Glass Fiber Filler


Why fill modified FEP with glass fiber?

  • Unfilled FEP limits its application due to its low mechanical strength, low wear resistance and high thermal expansion coefficient. FEP-based blends are ideal for injection or compression molding applications that require high temperature resistance, abrasion resistance, low friction, excellent chemical resistance, and toughness.
  • The use of various fillers in fluoropolymers can improve their rigidity, dimensional stability, reduce mold shrinkage, creep, reduce thermal expansion coefficient, and improve thermal conductivity and wear resistance.
  • FEP is prone to creep, which must be taken into consideration when designing parts to be used under continuous stress. By using suitable fillers, such as glass fiber or graphite, creep can be significantly reduced. Graphite, bronze and glass fibers also improve the wear resistance and stiffness of the resin. However, due to the difficulty of processing such mixtures, the choice of fillers and their amounts to improve FEP performance is limited.

Typical characteristics

 FEP with Glass Fiber Filler
Melting Point343 - 385 °C
Mass ContentFiller content, 20% to 30%
Specific Gravity2.20 ~2.22 g/cc
Tensile Strength27.6 ~ 33.1 Mpa
Elongation At Break0.5 ~ 3.0 %
Tensile Modulus4.83 ~ 6.89 Gpa
Linear Mould Shrinkage0.0020 - 0.0060 cm/cm @Thickness 3.17 mm
Flexural Strength38.6 ~ 48.3 Mpa
Flexural Modulus3.45 ~4.14 Gpa
Izod Impact-Notched1.60 ~ 2.40 J/cm @Thickness 3.17 mm
Izod Impact-Unnotched2.67 ~ 5.34 J/cm @Thickness 3.17 mm
Mold Temperature93.3 °C
Drying Temperature121 °C; 2 - 4 hour
Injection Pressure20.7 ~ 55.2 Mpa
FlammabilityV-0 @Thickness 1.59 mm

The benefits of glass fiber modified FEP

Compared with unmodified FEP grades, the tensile strength, HDT and flexural modulus are significantly increased. The mechanical properties of molded parts can be anisotropic.

Disadvantages of glass fiber modified FEP

Compared with unmodified FEP, the elongation at break and the notched Izod impact strength are reduced. The mechanical properties of molded parts can be anisotropic.


Chemical plant valves, electrical components and equipment.

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