|
|
| Advantage of PTFE |
| Heat |
PTFE retains its properties after exposure to temperatures beyond the limit of almost all other thermoplastics and elastomers. Depending on the end use requirements, PTFE is rated for continuous service at temperatures as high as 500 F. It can also sustain short exposure at higher temperature. |
| Flame resistance |
PTFE offers extraordinary resistance to high temperature and flames because it has a very high melting point and auto ignition temperature, as well as exceptional thermal degradation thresholds. PTFE's flame propagation characteristics, such as rate of heat release and smoke generation is very low. |
| Friction and wear |
PTFE has one of the lowest coefficients of friction of any solid material. Its abrasions resistance is adaptable to demanding environments by using inorganic fillers such as glass fiber, carbon or graphite. |
| Contamination |
PTFE is chemically pure and inert. It contains no additives such as lubricants, stabilizers, plasticizers or antioxidants that can contaminate process fluids. |
| Adhesion/Release |
PTFE has an extremely low surface energy in the solid state. This provides an excellent anti-stick, non-wetting contact surface. Conversely, when these resins are in a molten form, they become low surface-tension liquids, ideal for hot melt adhesives. |
| Low temperature service |
PTFE retains its excellent properties even at cryogenic temperatures. PTFE's impact resistance at these temperatures exceeds that of most other polymers. |
| Service life |
PTFE exhibits excellent retention of properties after a long period of time, even at elevated temperatures and in the presence of oils, solvents, UV light, oxidizing agents and other environmental agents. |
| Light stability |
PTFE has one of the lowest refractive indexes. It does not change its visual appearance after exposure to ultraviolet or infrared light. |
| Dielectrics |
PTFE has remarkable dielectric strength, low dielectric constant, low loss factors and high specific resistance. PTFE surpasses most material in its level and stability of dielectric properties over a wide range of environmental conditions. |
| Biodegradation |
PTFE is inert to microbiological and enzymic attack because the pure polymer does not provide any nourishment or porosity for these growths. |
| Atmospheric aging |
PTFE is not affected by ultraviolet and is resistant to oxidation, discoloration, and embitterment. |
| Humidity |
PTFE is completely resistant to hydrolysis. PTFE is a good barrier for water permeation. Its typical properties and dimensional stability remain unchanged even after long periods of time in water. |
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| |
GENERAL CHARACTERISTICS 100% PURE PTFE |
| Granular Powder |
|
|
|
|
POWDER |
Bulk density |
D-1457 |
g/1 |
700 ± 100 |
Compression ratio |
---- |
---- |
2.5 – 3 |
Particle size |
D-1457 |
---- |
~ 400 |
Pourability |
D-1895 |
s |
30 – 50 |
Moulding pressure |
---- |
kg/cm 2 , Psi , MPa |
250 – 350 , 3500 - 5000 , 25 - 35 |
SINTERED PARTS |
Specific gravity |
D-1457 |
---- |
2.14 – 2.16 |
Shrinkage |
D-1457 |
% |
-3.5/-4.5 |
Tensile strength |
D-1457 |
kg/cm , Psi , MPa |
250 – 310 , 3500 – 4400 , 25 – 30 |
Elongation |
D-1457 |
% |
280 – 380 |
Thermal stability |
D-1457 |
---- |
10 |
| Dielectric strength |
D-1457 , 0.1 mm |
kv/mm , v/mil |
~ 32 , ~ 800 |
Harness |
D-2240 |
Shore D |
55 – 58 |
Water absorption |
|
|
0% |
|
| |
| GRANULAR POWDER |
Compounds, properties and Application
A=properties
B=Examples of Application |
| Carbon |
A - Good Thermal Conductivity |
| |
B - Dynamic applications at high Speed |
| Graphite |
A - Good resistance to Wear, improved thermal Conductivity |
| |
B - Creeping bearings at high speed contact with medium hardness |
| Glass |
A - High resistance to wear, improved under load and permanent deformation |
| |
B - Bearings with high resistance to wear, Valve seats |
| MOS2 |
A - Low static coefficient of friction |
| |
B - Creeping slides used at high stresses |
| Bronze |
A - High resistance to compression, High thermal conductivity |
| |
B - Support Slides for heavy loads |
| Alumina Al |
A - Improved under load and permanent deformation Good dielectric properties |
| |
B - Electrical applications |
|
| |
Propeties |
Test
Method
(ASTM) |
Units |
Carbon |
Carbon |
Gra-phite |
Glass |
Glass |
Glass |
Bronze |
Bronze |
Alu-mina |
Alu-mina |
Filler Content
(% wt) |
- |
- |
25% |
35% |
15% |
25% |
15% |
Mos2 |
60% |
40% |
7% |
15% |
Specific Gravity |
D1457 |
- |
2.09
to
2.11 |
2.01
to
2.05 |
2.13
to
2.18 |
2.22
to
2.25 |
2.20
to
2.23 |
2.22
to
2.32 |
3.85
to
3.95 |
3.10
to
3.22 |
2.20
to
2.2 |
2.28
to
2.40 |
Bulk Density |
D1457 |
g/I |
425
±
25 |
500
±
40 |
500
±
40 |
475
±
50 |
- |
- |
1050
±
50 |
900
±
50 |
- |
- |
Tensile strength |
D1457 |
kg/cm |
190
to
210 |
115
to
130 |
140
to
210 |
130
to
150 |
170
to
240 |
200
to
240 |
125
to
150 |
180
to
240 |
240 |
180 |
Elognation |
D1457 |
% |
110
to
160 |
35
to
50 |
100
to
180 |
210
to
270 |
270
to
350 |
240
to
320 |
150
to
200 |
180
to
240 |
260 |
290 |
Hardness |
D2240 |
ShoreD |
71
to
73 |
72
to
74 |
62
to
65 |
66
to
68 |
64
to
66 |
64 |
71
to
73 |
67
to
69 |
64 |
66 |
Recommended
Moulding Pressure |
- |
kg/cm |
500 |
500 |
500 |
500 |
500 |
500 |
500 |
500 |
500 |
500 |
Sintering Temp.
(Recommended) |
- |
c |
375 |
375 |
375 |
375 |
375 |
375 |
375 |
375 |
375 |
375 |
|
| |
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