PTFE Moulded Products

Property

Unit

Test Method

Pure PTFE

Density

gm/cc

ASTM D- 792

2.1 - 2.2

Tensile Strength

kgf/cm²

ASTM D- 638

210-350

Elongation at Break

%

ASTM D- 638

250-400

Compressive Strength

kgf/cm

ASTM D- 695

40-50

Deformation

%

ASTM D- 621

a). 2 hrs. 23°C, 140 kg/cm²

12

b). 24 hrs. 23°C, 140 kg/cm

15

c). Permanent

8

d). 2 hrs. 150°C, 200 kg/cm

50

Flexural Modulus

kgf/cm

ASTM D- 790

57

Impact Strength

kg/cm

ASTM D- 256

a) -20°C

9

b)+ 20°C

15

Hardness

Scale D

Shore

55 -60

Coefficient of Friction

a) Dynamic P-7 kg/cm²

0.06

V-0.5 m/sec

b) Static P-35 kg/cm

0.05-0.08

Water Absorption

%

ASTM D- 570

0

Heat Resistance

-250 to +260

Thermal Conductivity

10 cal cm.

Cenco Fitch

6

Linear Thermal Expansion

%

ASTM D- 696

Axial - Radial

a). 30 - 150° C

1.5 1.5

a). 30 - 200° C

2.4 2.3

a). 30 - 250° C

3.4 3.6

Chemcal Resistance

PTFE is chemically inert & unaffected by all known chemicals except molten or dissolved alkali metals- Sodium, Potassium, Rubidium,Cesium, Francium & Fluorine Gas,Certain fluorine compounds & complexes at elevated temperatures. Filled PTFE has interior chemical resistance because of the presence of the particular filler.