Editorial Feature

Phenolic - PF Phenol Formaldehyde Chopped Fabric Filled; Medium Impact

Aug 16 2001

Phenol formaldehyde (PF) is a synthetic polymer produced by reacting phenol with formaldehyde. Fillers, such as wood pulp and cellulose, can be used to reinforce PF.

Polymer Type

Thermoset

Advantages

Compared with other filled phenolics, chopped fabric filled PF has:

  • Lowest cost

  • High elongation at break

Disadvantages

  • High mould shrinkage - compared to other phenolics

Typical Properties

Property

Value

Density (g/cm3)

1.38

Surface Hardness

RM114

Tensile Strength (MPa)

46

Flexural Modulus (GPa)

7.5

Notched Izod (kJ/m)

0.031

Linear Expansion (/°C x 10-5)

2.8

Elongation at Break (%)

1.3

Strain at Yield (%)

N/A

Max. Operating Temp. (°C)

150

Water Absorption (%)

0.8

Oxygen Index (%)

25

Flammability UL94

HB

Volume Resistivity (log ohm.cm)

11

Dielectric Strength (MV/m)

12

Dissipation Factor1kHz

0.06

Dielectric Constant  1kHz

8

HDT @ 0.45 MPa (°C)

260+

HDT @ 1.80 MPa (°C)

170

Material Drying  hrs @ °C

5 @ 40

Melting Temp. Range (°C)

60 -  80

Mould Shrinkage (%)

0.9

Mould Temp. Range (°C)

150 - 170

Applications

  • Connectors

  • Electrical housings

  • Switchgear

Source : Abstracted from Plascams

For more information on Plascams please visit The Rubber and Plastics Research Association

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