Simriz 498 FFKM O-Ring

Freudenberg Sealing Technologies Simriz 498 perfluoroelastomer (FFKM) O-ring — Freudenberg's ULTIMATE HIGH-TEMPERATURE FFKM flagship compound. Verified physical spec (Freudenberg Simriz 498 datasheet via Seal Company): FFKM material with patented Freudenberg cross-linking system (triazine cure per secondary sources); Shore A 80 hardness (DIN ISO 7619-1 at 23 C); tensile strength 18.6 MPa / 2,700 psi; elongation at break 160 percent; compression set 12 percent (70 hours at 204 C / 400 F per ASTM D395 Method B). Specific gravity and M100 tensile modulus are not published on the standard Freudenberg datasheet. Colour: not explicitly stated on the 498 sheet; Freudenberg's flagship high-temp Simriz compounds are typically black. Service temperature range: -6 C to +325 C (+21 F to +617 F). IMPORTANT — Simriz 498 is Freudenberg's TOP-OF-RANGE FFKM for extreme temperature service. This is NOT a general chemical-service grade at 230 C (that is Simriz 481, 484, 485 or 495 — different tier, roughly 1/3 the cost). Do not specify 498 where a mid-tier grade will suffice; do not substitute a 230 C-rated grade for 498 in service above 250 C (seal failure risk). Formulated to exceed AMS7257 aerospace FFKM standard per Freudenberg datasheet. Target chemical service (verified from datasheet): extreme temperature service; strong inorganic AND organic acids; steam and hot water; bases; hot amines; ketones; ethers; aldehydes; hot lubricants including MIL-PRF-23699 HTS turbine oils; sour gas; silanes; fluorinated fluids. Complete verified Simriz compound family (from Freudenberg brochure with per-grade Shore A hardness and continuous temperature range): Z7257 (aerospace, black, 75A, -6 to +320 C); Simriz 481 (industrial low-temp, black, 70A, -20 to +230 C); Simriz 484 (food and pharma FDA / USP Class VI, black, 75A, -7 to +230 C); Simriz 485 (chemical-resistant, black, 75A, -7 to +230 C); Simriz 486 / 486CP (semiconductor dry-process, white, 75A, -7 to +230 C); Simriz 487 (industrial, black, 75A, -6 to +300 C); Simriz 488 (semiconductor, ivory, 70A, -6 to +300 C); Simriz 489 (semiconductor, transparent, 65A, -6 to +280 C); Simriz 495 (general chemical / amines, 75A, -7 to +230 C — the general Chemraz-505-equivalent); Simriz 498 (ultimate high-temperature flagship, 80A, -6 to +325 C — THIS PRODUCT); Simriz 134 (oil and gas, black, 90A, -4 to +230 C); Simriz 501 (next-generation aerospace); Simriz 502 (oil and gas / CPI); Simriz 508 / 508CP (semiconductor wet, HDPCVD, PECVD, up to 325 C). Simriz grades 498+, 620, 640, 641 and the 700-series are referenced in some industry literature but were NOT confirmed in any Freudenberg-authored source in the current research pass. Cross-reference to Greene Tweed Chemraz (verified via The O-Ring Store product page cross-ref data): Simriz 498 corresponds to Chemraz 551, 615 and 653 — with CHEMRAZ 615 being the closest high-temperature analogue. Chemraz 505 (general chemical, 230 C) is NOT a direct 498 substitute — 505 is Simriz 495's tier. Cross-reference to DuPont / Chemours Kalrez (verified via ExploreMat comparison): Simriz 498 corresponds to Kalrez 4079, 6230, 6375 and 8900 — with KALREZ 4079 being the direct competitor (Kalrez 4079 rated max 316 C; Simriz 498 at 325 C carries a slight temperature edge over 4079). Kalrez 6375 (general chemical, ~275 C) is NOT a direct 498 substitute — 6375 is Simriz 495's tier. Cross-reference to Solvay / Precision Polymer Engineering (PPE) Perlast: no formal one-to-one cross-reference table for Perlast was found in Freudenberg or Solvay-authored sources. Applications (verified from Freudenberg datasheet): mechanical seals for high-temperature service, high-temperature pumps, valves, power generation, dispensing systems, spray guns, downhole oil and gas high-pressure high-temperature (HPHT), semiconductor high-temperature wet and dry process, aerospace fluid-handling and engine-nacelle sealing. Certifications NOT CLAIMED for Simriz 498 specifically (per research verification): FDA 21 CFR 177.2600, USP Class VI, 3-A dairy, NORSOK M-710, NACE TM-0296. Simriz 484 IS the confirmed FDA / USP Class VI food-and-pharma grade in the Simriz range. Do NOT specify Simriz 498 for FDA-regulated food contact, USP Class VI medical / pharma, or NORSOK / NACE regulated oil-and-gas applications without a Freudenberg compliance letter for the specific batch. Standard sizes: AS568 imperial dash number range (distributors including The O-Ring Store stock 498 across the AS568 range); ISO 3601 metric size range commonly available through distribution. Non-standard sizes moulded to order at RFQ. Datasheet URLs (Freudenberg-authored): fst.com/materials/ffkm-simriz/ (family page), plus Simriz 498 datasheet at sealcompany.com/wp-content/uploads/2023/03/SC_Simriz_498.pdf (Freudenberg-format datasheet mirror). cBallast supplies the full Freudenberg Simriz range plus Chemraz, Kalrez and Perlast cross-brand equivalents in AS568 or metric ISO 3601 sizes. Request a quote by AS568 dash number (or ID x CS metric), continuous service temperature (VERIFY under 325 C for a 498 spec — above that consult supplier), chemical service (acids/bases/steam/hydrocarbons/etc), and any regulatory certification requirement (specify AMS7257 aerospace or route to Simriz 484 for FDA / USP if that is the actual need).