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
Chemical composition comparison (wt%)
Side-by-side: PVDF (Kynar) (COMPOSITION) (ISO 12086) vs Kynar (Arkema) (TRADE)
| Element | PVDF (Kynar) (COMPOSITION) | Kynar (Arkema) (TRADE) | Overlap |
|---|---|---|---|
| Base Polymer (Polyvinylidene Fluoride) | 99–99.9% | — | — |
Mechanical properties
Injection Molded
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 35–55 | MPa |
| Yield Strength | 35–50 | MPa |
| Elongation | 20–300 | % |
| Elastic Modulus | 1.8–2.2 | GPa |
| Density | 1.76–1.78 | g/cm3 |
| Melting Point | 165–172 | °C |
| Glass Transition Temp (Tg) | ≥ -35 | °C |
| Continuous Use Temp | 130–150 | °C |
| Water Absorption (24h) | 0.02–0.04 | % |
Compatibility verdict
PVDF (Kynar) and Kynar (Arkema): 95% composition match
Close equivalents but NOT identical.
Related materials
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)
Carbon fiber reinforced epoxy — the benchmark structural composite material. Unidirectional ply: tensile strength 1500–2000 MPa, modulus 120–150 GPa at density 1.55 g/cm³ (5x stronger than steel at 1/5 the weight). Quasi-isotropic layup: UTS ~600 MPa, E ~50 GPa. Autoclave-cured prepreg (aerospace) or infusion/RTM (industrial). Used in aerospace primary structures (fuselage, wings), Formula 1 chassis, bicycle frames, wind turbine blades, pressure vessels (Type IV) and high-end sporting goods. Fiber types: T300, T700, T800, M40J, M55J.
FKM (Fluoroelastomer / Viton)
Fluoroelastomer — THE high-temperature and chemical-resistant rubber. Outstanding resistance to oils, fuels, acids, and solvents at temperatures up to 200°C (short-term 230°C). Fluorine content (64-70%) determines chemical resistance. Trade names: Viton (Chemours), Tecnoflon (Solvay), Dai-El (Daikin). 5-10x more expensive than NBR. Used for aerospace fuel seals, chemical process seals, automotive fuel injector O-rings, semiconductor processing, and any seal exposed to aggressive chemicals at high temperature.
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