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PTFE PROPERTIES:

ASTM or UL test

Property

PTFE (unfilled)

PTFE (25% glass filled)

PTFE (25% carbon filled)

PHYSICAL

D792

Density (lb/in³)

(g/cm³)

0.078

2.16

0.081

2.25

0.075

2.08

D570

Water Absorption, 24 hrs (%)

0.01

0.02

0.05

MECHANICAL

D638

Tensile Strength (psi)

3,900

2,100

1,900

D638

Tensile Modulus (psi)

80,000

D638

Tensile Elongation at Break (%)

300

270

75

D790

Flexural Strength (psi)

No break

1,950

2,300

D790

Flexural Modulus (psi)

72,000

190,000

160,000

D695

Compressive Strength (psi)

3,500

1,000

1,700

D695

Compressive Modulus (psi)

70,000

110,000

87,000

D785

Hardness, Shore D

D50

D60

D62

D256

IZOD Notched Impact (ft-lb/in)

3.5

THERMAL

D696

Coefficient of Linear Thermal Expansion

(x 10·in./in./°F)

7.5

6.4

6

D648

Heat Deflection Temp (°F/ °C)

at 264 psi

132/55

150/65

150/65

D3418

Melting Temp (°F/ °C)

635/335

635/335

635/335

Max Operating Temp (°F/ °C)

500/260

500/260

500/260

C177

Thermal Conductivity (BTU-in/ft²-hr-°F)

(x 10·4 cal/cm-sec-°C)

1.7

5.86

3.1

10.6

4.5

15.5

UL94

Flammability Rating

V-O

V-O

V-O

ELECTRICAL

D149

Dielectric Strength (V/mil) short time, 1/811 thick

285

D150

Dielectric Constant at 1 MHz

2.1

2.4

D150

Dissipation Factor at 1 MHz

< 0.0002

0.05

D257

Volume Resistivity (ohm-cm) at 50% RH

> 1018

> 1015

104

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POM C PROPERTIES:

Mechanical

dry/moist

standard

Tensile strength at yield

62

MPa

DIN EN ISO 527

Elongation at break

30

%

DIN EN ISO 527

Modulus of elasticity in tension

2700

MPa

DIN EN ISO 527

Hardness

145

DIN 53 456 (Kugeldruckhärte)

Impact strength 23° C (Charpy)

n.b.

KJ/m²

DIN EN ISO 179 (Charpy)

Creep rupture strength

after 1000 h with static load

40

MPa

Time yield limit

for 1% elongation after 1000 h

13

Co-efficient of friction

p = 0,05 N/mm²v = 0,6 m/s

on steel, hardened and ground

0,32

MPa

Wear

p = 0,05 N/mm²v = 0,6 m/s

on steel, hardened and ground

8,9

μm/km

Thermal

dry/moist

standard

Glass transition temperature

– 60

°C

DIN 53 765

Heat distortion temperature

HDT, Method A

110

°C

ISO-R 75 Verfahren A (DIN 53 461)

Heat distortion temperature

HDT, Method B

160

°C

ISO-R 75 Verfahren B (DIN 53 461)

Max. service temperature

short term

long term

140

100

°C

°C

Thermal conductivity (23°C)

0,31

W/(K·m)

Specific heat (23°C)

1,5

J/g. K

Coefficient of thermal expansion

(23-55°C)

10

10·5 1/K

DIN 53 752

Electrical

dry/moist

standard

Dielectric constant (106 Hz)

3,5

DIN 53 483, IEC-250

Dielectric loss factor (106 Hz)

0,003

DIN 53 483, IEC-250

Specific volume resistance

10˄14

Ω*cm

DIN IEC 60093

Surface resistance

10˄14

Ω

DIN IEC 60093

Dielectric strength

>50

kV/mm

DIN 53 481, IEC-243, VDE 0303 Teil 2

Resistance to tracking

KA 3c

DIN 53 480, VDE 0303 Teil 1

Miscellaneous

dry/moist

standard

Density

1,41

g/cm³

DIN 53 479

Moisture absorption

(23°C/50RH)

<0,3

%

DIN EN ISO 62

Water absorption to equilibrium

0,5

%

DIN EN ISO 62

Flammability acc. to UL standard 94

HB

Resistance to hot water, washing soda:

(+)

Resistance to weathering