About PTFE
Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene that has numerous applications.
PTFE is a fluorocarbon solid, as it is a high molecular weight compound consisting wholly of carbon and fluorine. PTFE is hydrophobic: neither water nor water-containing substances wet PTFE. PTFE has one of the lowest coefficients of friction of any solid.
It is nonreactive, partly because of the strength of carbon–fluorine bonds, and so it is often used in containers and pipework for reactive and corrosive chemicals. Where used as a lubricant, PTFE reduces friction, wear, and energy consumption of machinery. It is also used as a graft material in surgical interventions.
| Property | Unit | Test Method | Virgin PTFE | Chemically Modified PTFE | 15% Glass Filled PTFE | 25% Glass Filled PTFE | 5% Glass +5% MoS2 Filled PTFE | 15% Glass + 5% MoS2 Filled PTFE | 23% Carbon + 2% Graphite / 25% Carbon Filled PTFE | 33% Carbon + 2% Graphite / 35% Carbon Filled PTFE | 15% Graphite Filled PTFE | 40% Bronze / TSQ Filled PTFE | 40% Bronze + 5% MoS2 Filled PTFE | 60% Bronze Filled PTFE | 55% Bronze + 5% MoS2 Filled PTFE |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Density | gm / cc | ASTM D-792 | 2.10 – 2.20 | 2.15 – 2.20 | 2.15 – 2.22 | 2.22 – 2.25 | 2.20 – 2.24 | 2.20 – 2.24 | 2.00 – 2.20 | 2.00 – 2.14 | 2.10 – 2.16 | 3.00 – 3.20 | 3.00 – 3.20 | 3.80 – 4.00 | 3.80 – 4.00 |
| Tensile Strength | kgf / cm2 | ASTM D-638 | 210 – 375 | 300 – 325 | 180 – 260 | 125 – 200 | 175 – 250 | 150 – 220 | 125 – 200 | 100 – 175 | 150 – 200 | 125 – 225 | 125 – 225 | 100 – 200 | 100 – 200 |
| Elongation | % | ASTM D-638 | 250 – 400 | 400 – 450 | 225 – 325 | 200 – 300 | 200 – 300 | 220 – 320 | 80 – 150 | 100 – 150 | 150 – 250 | 200 – 350 | 200 – 350 | 150 – 300 | 150 – 300 |
| Compressive Strength | kgf / cm2 | ASTM D-695 | 40 – 50 | 45 – 55 | 65 – 75 | 75 – 85 | 60 – 70 | 65 – 75 | 75 – 85 | 80 – 90 | 65 – 75 | 85 – 100 | 80 – 95 | 115 – 125 | 115 – 125 |
| Deformation Under Load(Max.) | % | ASTM D-621 | |||||||||||||
| a. 2hrs 23*C 113kgf | 12 | 3.5 | 10 | 9 | 11 | 10 | 5 | 4 | 6 | 5 | 5 | 4 | 4 | ||
| b. 24hrs 23*C 113kgf | 15 | 5 | 12 | 11 | 13 | 12 | 7 | 6 | 8 | 6 | 6 | 5 | 5 | ||
| c. Permanent | 8 | 2.5 | 7.5 | 7 | 8.5 | 7.5 | 3.5 | 3 | 4.5 | 3 | 3 | 2.5 | 2.5 | ||
| d. 2hrs 150*C 113kgf | 55 | 40 | 52 | 50 | 52 | 50 | 35 | 30 | 43 | 42 | 42 | 40 | 40 | ||
| Impact Strength | J/cm | ASTM D-256 | 1.4 – 1.5 | 1.60 – 1.75 | 1.2 – 1.3 | 1.0 – 1.1 | 1.25 – 1.35 | 1.2 – 1.3 | 0.7 – 0.8 | 0.6 – 0.7 | 0.8 – 0.9 | 0.9 – 1.0 | 0.9 – 1.0 | 0.8 – 0.9 | 0.85 – 0.95 |
| Hardness | Shore D | ASTM D-2240 | 58 – 62 | 56 – 62 | 58 – 62 | 58 – 63 | 60 – 65 | 60 – 65 | 60 – 65 | 60 – 65 | 60 – 65 | 62 – 66 | 62 – 66 | 64 – 68 | 64 – 68 |
| Co-efficient of friction | ASTM D-1894 | ||||||||||||||
| a. DynamicP-7 kg/cm2 V-0.5 | 0.04 – 0.06 | 0.02 – 0.03 | 0.31 – 0.37 | 0.5 – 0.54 | 0.15 – 0.20 | 0.15 – 0.20 | 0.12 – 0.17 | 0.13 – 0.18 | 0.11 – 0.16 | 0.11 – 0.15 | 0.10 – 0.14 | 0.12 – 0.16 | 0.11 – 0.14 | ||
| b. Static P-35 kg/cm2 | 0.05 – 0.08 | 0.04 – 0.06 | 0.10 – 0.12 | 0.11 – 0.13 | 0.08 – 0.10 | 0.08 – 0.10 | 0.09 – 0.11 | 0.10 – 0.12 | 0.08 – 0.10 | 0.08 – 0.10 | 0.075 – 0.09 | 0.08 – 0.10 | 0.07 – 0.09 | ||
| Wear Rate (Max.) | gm/s | ASTM G-137 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 |
| Water Absorption (Max.) | % | ASTM D-570 | 0 | 0 | 0.015 | 0.013 | 0.015 | 0.015 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Continuous Service Temperature | *C | ASTM D-648 | +260 | +260 | +260 | +260 | +260 | +260 | +260 | +260 | +260 | +260 | +260 | +260 | +260 |
| Heat Resistance (Max.) | % | ASTM D-648 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 |
| Co-efficient of linear thermal expansion – 10-6 X | % | ASTM D-696 | 250 – 275 | 250 – 275 | 240 – 265 | 235 – 255 | 245 – 270 | 240 – 265 | 225 – 250 | 215 – 240 | 240 – 265 | 200 – 225 | 200 – 225 | 175 – 200 | 175 – 200 |
| Linear Thermal Expansion (Max.) | % | ASTM D-696 | A ~ R | A ~ R | A ~ R | A ~ R | A ~ R | A ~ R | A ~ R | A ~ R | A ~ R | A ~ R | A ~ R | A ~ R | A ~ R |
| a. 30* – 150* C | 1.50 ~ 1.50 | 1.50 ~ 1.50 | 1.50 ~ 1 | 1.50 ~ 0.70 | 1.50 ~ 1 | 1.50 ~ 1 | 1.20 ~ 1.00 | 1.10 ~ 0.90 | 1.30 ~ 1.00 | 1.15 ~ 0.95 | 1.15 ~ 0.95 | 1.10 ~ 0.90 | 1.10 ~ 0.90 | ||
| b. 30* – 200* C | 2.40 ~ 2.30 | 2.40 ~ 2.30 | 2.30 ~ 1.80 | 2.20 ~ 1.00 | 2.30 ~ 1.80 | 2.30 ~ 1.80 | 1.90 ~ 1.50 | 1.80 ~ 1.40 | 2.00 ~ 1.70 | 1.85 ~ 1.55 | 1.85 ~ 1.55 | 1.80 ~ 1.50 | 1.80 ~ 1.50 | ||
| c. 30* – 250* C | 3.40 ~ 3.60 | 3.40 ~ 3.60 | 3.30 ~ 2.20 | 3.20 ~ 1.40 | 3.30 ~ 2.20 | 3.30 ~ 2.20 | 2.70 ~ 2.40 | 2.50 ~ 2.30 | 3.00 ~ 2.50 | 2.55 ~ 2.25 | 2.55 ~ 2.25 | 2.50 ~ 2.20 | 2.50 ~ 2.20 | ||
| Dielectric Strength | Kv/mm | ASTM D-149 | 22 – 24 | 30 – 35 | 15 – 16 | 11 – 12 | 15 – 16 | 15 – 16 | 1 – 2 | 1 – 2 | 1 – 2 | Conductive | Conductive | Conductive | Conductive |
| Dimensional Stability | % | ASTM D-1710 | |||||||||||||
| a. Length | 1.50 – 3.00 | 1.50 – 3.00 | 1.50 – 3.00 | 1.50 – 3.00 | 1.50 – 3.00 | 1.50 – 3.00 | 1.50 – 3.00 | 1.50 – 3.00 | 1.50 – 3.00 | 1.50 – 3.00 | 1.50 – 3.00 | 1.50 – 3.00 | 1.50 – 3.00 | ||
| b. Diameter | 0.50 – 1.00 | 0.50 – 1.00 | 0.50 – 1.00 | 0.50 – 1.00 | 0.50 – 1.00 | 0.50 – 1.00 | 0.50 – 1.00 | 0.50 – 1.00 | 0.50 – 1.00 | 0.50 – 1.00 | 0.50 – 1.00 | 0.50 – 1.00 | 0.50 – 1.00 | ||
| Chemical Resistance (Max.) | % | ASTM D-543 | |||||||||||||
| a. Permeability | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | ||
| b. Dissolution | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 |
