PTFE Technical Specification
What is a fluoropolymer?
A fluoropolymer is a fluorocarbon-based polymer with multiple carbon–fluorine bonds. The best known fluoropolymer is polytetrafluoroethylene(PTFE).
Fluoropolymers have superior heat resistance, chemical resistance, good electrical insulation. Besides the above characteristics, fluoropolymers also carry nonstick and low-frictional properties.
The best known fluoropolymer is polytetrafluoroethylene(PTFE), and it exhibits outstanding resistance to chemical, resists all chemicals except fluorine gas, chlorine trifuloride, and molten alkali metals. But when in high temperature, PCTFE is slightly susceptible to ammonia and chlorine gas.
Among fluoropolymers, PTFE exhibits the lowest frictional coefficient and provides unique self-lubricating properties. It can be used up to 260 degree C.Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene that has numerous applications. The commonly known brand name of PTFE-based compositions is Teflon™ by Chemours, a spin-off from DuPont, which originally discovered the compound.
Features of PTFE
- Extreme chemical resistance
- Very low coefficient of friction
- Wide temperature range
- FDA approved
- Excellent thermal stability
- Excellent electrical insulation
- Long shelf life
PTFE Technical Specification - Fluoropolymer Properties
| Item | Unit |
ASTM Test Method |
PTFE (4F) |
PFA |
PCTFE (3F) |
PVDF (2F) |
FEP (4-6F) |
PEEK | |
|
Physical Properites |
Density | D792 | 2.14~2.2 | 2.12~2.17 | 2.1~22 | 1.75~2.17 | 2.12~2.17 | 1.31 | |
| Melting Point | oC | 327 | 302~310 | 210~212 | 170 | 253~282 | 340 | ||
|
Mechanical |
Tensile Strength | Kg/cm2 | D638 | 280~350 | 320 | 315~420 | 400~520 | 200~320 | 1142 |
| Elongation | % | D638 | 200~400 | 280~300 | 80~250 | 100~300 | 250~330 | 20 | |
| Compression Strength | Kg/cm2 | D695 | 120 | -- | 320~520 | 600 | 150 | ||
| Impact Strength | Kg*cm/cm | D256 | 16.3 | Not Damaged | 13.6~14.7 | 19.6~21.8 | Not Damaged | Not Damaged | |
| Hardness | Rockwell Hardness | D785 | R25 | -- | R75~95 | R100~115 | R25 | R126 | |
| Hardness | Shore Hardness | D1706 | D55 | D60 | D90 | D55 | D85 | ||
| Static Friction Coefficient | -- | 0.05 | -- | 0.25 | D80 | -- | |||
| Kinetic Friction Coefficient | -- | 0.1 | 0.2 | 0.37 | 0.1 | 0.3 | 0.4 | ||
|
Heat Properties |
Heat Conductivity | 104cal/cm.sec. oC | C117 | 5.9 | 6.2 | 4.7~5.3 | 0.39 | 6 | |
| Coefficient of Linear Expansion | 106/oC | D696 | 9.9(23~66oC) | 12(21~100oC | 4.5~7.0 | 3 | 8.3~10.5(-17~71oC) | ||
| Operating Temperature | oC | 260 | 260 | 150~180 | 8.5 | 200 | 300 | ||
|
Electrical Properties |
Volume Resistivity | .cm | D257 | >1018 | >1018 | 12*1018 | 150 | >1018 | |
| Surface Resistivity | D257 | >1016 | >1016 | -- | 20*1014 | >1016 | >1013 | ||
| Insulation Resistivity | 1/8" thick Kv/mm | D149 | 16~4 | 20~24 | 20~24 | -- | 20~24 | 24 | |
| Durability | Chemical Resistance | D543 | Excellent | Excellent | Good | Good | Excellent | Good | |
| Flammability | % | D635 | Non-Flammable | Non-Flammable | Non-Flammable | Self-Digested | Non-Flammable | Flame Resistant | |
| Permeability | % | D570 | <0.01 | 0.03 | 0 | 0.04 | <0.01 | 0.1 | |
Types of Fluoropolymers and Chemical Resistance Comparison
| Category (Name) |
Molecule Structure (Fluorine per molecule) |
Melting Point and Operating Temperature | Chemical Resistance |
| PTFE |
|
m.p. 327oC W.TEMP(MAX) 260oC |
Excellent chemical stability; |
| ETFE |
|
m.p. 270oC W.TEMP(MAX) 150oC |
Similar to the chemical resistance of PTFE, but easily corroded by nitric acids. Has chemical resistance on par with PTFE, but easily corroded by certain chemicals such as nitric acid. |
| ECTFE |
|
m.p. 240oC W.TEMP(MAX) 150oC |
Highly crystalline, high polymer material, with superior permeability properties. |
| PFA |
|
m.p. 302~310oC W.TEMP(MAX) 260oC |
Similar to the chemical resistance of PTFE, with superior mechanical and sanitary properties. |
| FEP |
 |
m.p. 253~282oC W.TEMP(MAX) 160oC |
Similar to the chemical resistance of PTFE, but has slightly lower operating temperature. |
| PVDF |
|
m.p. 170oC W.TEMP(MAX) 130~150oC |
Easily dissolved by fuming sulfuric acid, high temperature sulfuric acid, or caustic soda above 100oC; also bloats or dissolves when interacting with strong solvents such as aceton、ketone、DMA, acetamide or extremely alkalic primary amine such as n-butylamine. |
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Links of Related Products:
►What is PTFE?
►PTFE Molding Components
►Valve Seat Material
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►PFA Lined Valves & Accessories