PVDF (Kynar)
Polyvinylidene Fluoride — the melt-processable fluoropolymer. Bridges the gap between PTFE (non-melt-processable) and conventional plastics. Excellent chemical resistance to acids, solvents, and hydrocarbons. Uniquely piezoelectric among polymers. Much stronger than PTFE (UTS 50 vs 25 MPa). Trade names include Kynar (Arkema), Solef/Hylar (Solvay), KF (Kureha). Used for chemical piping/valves/tanks, lithium-ion battery binder, semiconductor wet bench, architectural coatings (Kynar 500), and piezoelectric sensors.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| ISO | INT | PVDF | — | REF | |
| 🇺🇸 | ASTM | USA | ASTM D3222 | — | 100% |
| 🇫🇷 | TRADE | France | Kynar (Arkema) | — | 95% |
| TRADE | BE | Solef / Hylar (Solvay) | — | 95% |
Sources: ISO 10350, ASTM D3222, Arkema TDS, Solvay TDS
Mechanical properties — Pro
Injection Molded
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ||
| Yield Strength | ||
| Elongation | ||
| Elastic Modulus | ||
| Density | ||
| Melting Point | ||
| Glass Transition Temp (Tg) | ||
| Continuous Use Temp | ||
| Water Absorption (24h) |
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EPDM (Ethylene Propylene Diene Rubber)
Ethylene propylene diene monomer rubber — THE outdoor/weather elastomer. Saturated backbone gives outstanding ozone, UV, and weathering resistance. Excellent resistance to steam, hot water, and polar solvents. NOT resistant to oils/fuels (opposite of NBR). Good electrical insulation. ρ 0.85-1.3 (lightest common rubber). Used for automotive door/window seals, roofing membranes, radiator hoses, HVAC gaskets, and pond liners.
Epoxy/Carbon Fiber (CFRP)
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FKM (Fluoroelastomer / Viton)
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