Engineering Polymer & Elastomer Materials Guide
Detailed technical guide to polymer chemistry, temperature envelopes, chemical resistance, and ASTM D2000 classifications across Horiaki India's full material spectrum.
FFKM (Perfluoroelastomer) — Ultra-High Performance
-20°C to +327°CFFKM is the highest-tier elastomeric sealing material commercially available, containing fully fluorinated backbone polymer chains with zero hydrogen atoms. This molecular architecture delivers chemical inertness comparable to PTFE combined with the true elastic recovery of an elastomer.
Formulated for semiconductor plasma etch chambers, aggressive chemical reactors, and high-temperature subsea oil recovery.
Key Highlights & Declarations:
- ASTM D2000 Classification: FFKM / FK.
- Resistant to over 1,800 chemicals, including RF plasma, ketones, amines, hot steam, and acids.
- Sub-10nm purity with ICP-MS metal extractables below 0.1 ppb.
- Compression set < 20% after 70 hours at 200°C.
FKM (Fluoroelastomer / Viton®)
-20°C to +230°CFKM copolymers and terpolymers feature high fluorine content (66% to 70%), providing exceptional resistance to petroleum fuels, synthetic engine oils, hydraulic fluids, and ozone degradation. Widely used in automotive powertrains, aerospace hydraulics, and chemical valve stems.
Key Highlights & Declarations:
- ASTM D2000 Classification: HK.
- Hardness range: 60 to 90 Shore A.
- Bisphenol-cured and peroxide-cured formulations available.
Silicone Rubber (VMQ, LSR, HTV, RTV)
-60°C to +250°CPolysiloxane elastomers feature an alternating silicon-oxygen (Si-O) molecular backbone, granting unsurpassed retention of elasticity at sub-zero temperatures and high thermal resistance. Non-toxic, physiologically inert, and fungus-resistant.
Key Highlights & Declarations:
- ASTM D2000 Classification: FC, FE, GE.
- Liquid Silicone Rubber (LSR): Two-part platinum-cured for cleanroom medical parts (USP Class VI).
- High Temperature Vulcanizing (HTV): Solid gum silicone for molded gaskets, tubing, and food seals (FDA 21 CFR 177.2600).
- Room Temperature Vulcanizing (RTV): Flowable formulations for potting and encapsulation.
Cast Polyurethane (PU) — High Abrasion Resistance
-40°C to +85°CHot-cast prepolymer polyurethane (TDI / MDI and ether / ester polyols) bridges the gap between rubber and rigid plastics, offering up to 5x higher sliding abrasion resistance than hardened steel and high load-bearing capacity.
Key Highlights & Declarations:
- Hardness range: 60 Shore A to 75 Shore D.
- DIN 53516 abrasion loss < 15 mm³.
- Ideal for mining screens, heavy industrial rollers, slurry pipeline cleaning pigs, and forklift wheels.
EPDM (Ethylene Propylene Diene Monomer)
-40°C to +140°CNon-polar elastomer with an exceptionally stable saturated polymer backbone. Outstanding resistance to hot water, steam, ozone, weathering, and dilute acids. Certified under German UBA KTW-BWGL and DVGW W270 for municipal potable water mains.
Key Highlights & Declarations:
- ASTM D2000 Classification: BA, CA, DA.
- Safe for human drinking water and natural gas transmission.
- Incompatible with petroleum oils and hydrocarbon solvents.
PTFE (Polytetrafluoroethylene) & Bonded Fluoropolymers
-200°C to +260°CPure and filled PTFE formulations offering near-universal chemical inertness (pH 0-14), ultra-low friction (0.04), and high dielectric strength. Chemically bonded to stainless steel and elastomeric cores for valve liners and high-purity fluid handling.
Key Highlights & Declarations:
- Virgin, 15%-25% glass-filled, carbon-filled, and bronze-filled grades.
- Permanent bond strength to metal inserts exceeding 12 MPa (ASTM D429).
- Ideal for corrosive chemical pumps, butterfly valve seats, and semiconductor wet benches.
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