PTFE | History | Properties
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PTFE (Polytetrafluoroethylene) is a completely fluorinated polymer, manufactured from
the polymerization of the free radical from the the tetrafluoroethylene. It is also a crystalline polymer
with melting temperature of 327ºC and density between 2.13 and 2.19 g/cm3. It presents
exceptional resistance to chemical substances.
• Ref. Table Pure PTFE
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| PROPERTY |
Measurement Unit |
Granular Resin |
Density
|
G/cm3 |
2,18 |
| Absorption in water |
% |
0 |
Thermal expansion
coefficient |
1/k |
12 |
| Melting temperature |
ºC |
327 |
| Glass Transition Temperature |
ºC |
- |
Temperature at
distortion with heat |
ºC |
49 |
Ongoing service
temperature |
ºC |
260 |
Fragility
temperature |
ºC |
-200 |
| Young's Module |
Mpa |
420 |
| Flexion Module |
Mpa |
630 |
| Flexion Resistance |
Mpa |
NB |
Stress of resistance
to breaking |
Mpa |
28 |
| Elongation to breaking |
% |
200 |
| Resistance to impact |
J/m |
160 |
Rel. Permissiveness
(1 MHZ) |
1 |
2,1 |
Dissipation factor
104 |
1 |
3 |
Volumetric
resistivity |
Ωm |
>1018 |
Crit. Superficial
tension |
mN/ m |
19 |
| Threshold of O2 index |
- |
- |
• Manufacturing process:
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• Table of compositions - TEFLON® with load (most usual loads)
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FREE FLOW |
LOAD |
2801 A |
5% Fiberglass |
2803 A |
15% Fiberglass |
2804 A |
20 % Fiberglass |
2805 A |
25% Fiberglass |
2822 A |
10% Graphite |
2823 A |
15% Graphite |
2844 A |
40% Bronze |
2846 A |
60% Bronze |
2864 A |
20% Fiberglass / Graphite |
2870 A |
25% Fiberglass / Special load |
2874 A |
15% Fiberglass / 5% MoS2 |
2882 A |
55% Bronze / 5% MoS2 / Special load |
2891 A |
25% Carbon / Graphite |
2892 A |
32% Carbon / Graphite |
• Properties obtained on PTFE with use of loads
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Fiberglass |
Resistance to compression
Resistance to wearing
Great chemical resistance |
Carbon |
Resistance to compression
Resistance to wearing
Good thermal conductivity. |
Graphite |
Good thermal conductibility
Good sliding properties
Low friction coefficient |
Bronze |
Resistance to compression
Resistance to wearing
Low cold flow
Great thermal conductibility |
MoS2 |
Great sliding property
Reduces wearing |
|
