Gasket material
Viton® (FKM) Gaskets
Viton (FKM) gaskets for fuels, oils, acids and heat to 204 C: the published range, the durometers and thicknesses we supply, and the callouts a print may carry.
- Family
- FKM (fluorocarbon)
- Standard range
- -26 C to 204 C (Parker® O-Ring Handbook ORD 5700)
- Special grades
- to -46 C, to 232 C time-limited (about 3,000 hours)
- Durometers
- 60 and 75 Shore A on our waterjet; 90 Shore A cut by a partner
- Standards
- ASTM D1418 FKM; ASTM D2000 line callouts; SAE AMS-R-83248 (cancelled; still on older prints)
- Product
- Sheet gaskets waterjet-cut to your drawing in Orange, California
Service temperatures here are the family figures published in Parker O-Ring Handbook ORD 5700A/US §2.2; the compound datasheet and your application govern the final choice.
Every common gasket sheet material is quick for us to source, and we cut it to your print on our waterjet. The other sheet materials are on the waterjet-cut gaskets page.
Viton (FKM) is the gasket material for fuels, oils, many acids and heat to 204 C (400 F): the Parker O-Ring Handbook (ORD 5700) rates the family from -26 C (-15 F) to 204 C continuous, with low-temperature grades to -46 C. Conquest cuts Viton sheet gaskets on the waterjet, nesting the sheet tightly because the material is expensive and a die would waste it. The material family is FKM, and other makers' FKM sheet meets the same callouts.
What we cut
Conquest cuts sheet gaskets on a pure-water waterjet, the one product made in house. Tolerance is set to your drawing and confirmed on the quote, and the waterjet's size limits and the tolerance class for solid rubber are on the custom gaskets page. There is no die to build, so prototypes, revision changes and short runs go through the same setup as a repeat, and expensive stock nests tightly with no die-skeleton waste. Molded and lathe-cut parts, and non-sheet compounds, are supplied from our manufacturers.
We cut Viton sheet in 60 and 75 Shore A on the waterjet, 1/16, 1/8, 3/16 and 1/4 in thick, from 36 x 36 in sheet and 36 in rolls; 90 Shore A Viton gaskets are cut by a cutting partner. We do not laser-cut FKM sheet.
Viton (FKM) gasket specifications
| Property | Value | Source |
|---|---|---|
| Continuous service temperature | -26 C to 204 C (-15 F to 400 F); low-temperature grades to -46 C; short excursions above 204 C | Parker ORD 5700 |
| Material designation | FKM under ASTM D1418; ASTM D2000 line callouts; the standard sets types by heat-aging resistance and classes by oil-swell resistance | ASTM D2000 |
| Specification callouts | SAE AMS-R-83248 (the SAE re-issue of MIL-R-83248) and MIL-R-83248 are both cancelled but still appear on older prints; on O-rings, DoD cancelled M83248/1 in 2008 and pointed future purchases to SAE AS3209 (boss sizes to AS3208), and SAE later issued AS83248/1 (2014, AMS7276 material), which DoD adopted on 2025-11-03; the M83248/2 sheet is cancelled too, and SAE AS83248/2 (AMS7259 material) was adopted the same day | DLA ASSIST and SAE Mobilus records, read 2026-09-24 and 2026-09-25 |
Where Viton gaskets work, and where they fail
| Medium or condition | Verdict | Note (Parker O-Ring Handbook ORD 5700 ratings for its O-ring compounds, not for sheet: 1 satisfactory, 2 fair, 4 unsatisfactory) |
|---|---|---|
| Engine, gearbox and hydraulic oil | Satisfactory (1) | The core FKM application |
| Gasoline, diesel, jet fuel, aromatic blends | Satisfactory (1) | Aromatic fuels that swell nitrile; NBR rates 4 in benzene and toluene |
| Chlorinated solvents, aromatics | Satisfactory (1) | FKM rates 1 in trichloroethylene, carbon tetrachloride, benzene and toluene |
| Concentrated acids at room temperature | Satisfactory (1) in hydrochloric and sulfuric; fair (2) in nitric | At 70 C (158 F) hydrochloric and sulfuric acid still rate FKM 1, while nitric acid rates FKM 4 and FFKM 2 |
| Ozone, weathering, vacuum | Satisfactory (1) in ozone | Very low gas permeability; high vacuum is on Parker's compatible list |
| Hot water and steam | Fair in water (2); unsatisfactory in steam (4) | EPDM E0692-75 or FFKM for steam |
| Ketones, amines, glycol brake fluid | Unsatisfactory (4) | EPDM for ketones and brake fluid; FFKM rates fair to satisfactory in amines (mixed amines 2) |
Where Viton is used, and the usual alternatives
It is usually specified for fuel and oil flanges at temperature, chemical-processing covers, fryer and hot-oil food lines on a compliant compound, and anywhere nitrile runs out of heat or chemical headroom. It is not the sheet for steam, hot water, brake fluid or ketones, where an EPDM gasket belongs, and nitrile is usually specified where the duty is oil under 100 C, since it does the same job at lower cost. Bolted pipe joints carrying steam also take compressed non-asbestos fiber (CNAF) gaskets. For mixed aggressive chemistry beyond FKM, the FFKM guide covers the next step; the Viton O-ring guide covers the same material in O-ring form.
Sources: DLA ASSIST document records for MIL-R-83248, MIL-R-83248/1 and /2, SAE AS83248/1 and SAE AS83248/2, and the SAE Mobilus record for AMS-R-83248 (read 2026-09-24 and 2026-09-25); the MIL-R-83248/1A cancellation notice (Notice 5, 2008-07-24), read 2026-09-29; SAE Mobilus current-revision record for AS83248/1A (issued December 2014), read 2026-09-27; ASTM D1418-22, public abstract (read 2026-09-28); ASTM D2000-18(2024)e1, public scope (read 2026-09-25); Parker O-Ring Handbook ORD 5700 §2.2 (read 2026-09-14) and its section VII compatibility tables (read 2026-09-25); Stockwell Elastomerics, Laser Cut Gaskets vs. Waterjet Cut Gaskets (read 2026-09-24); The Chemours Company, Viton Fluoroelastomers Selection Guide C-11021 (9/19), page 1: the 232 C figure is a time-limited service limit of about 3,000 hours (read 2026-09-27).
Parker is a trademark of Parker Hannifin Corporation. Viton is a trademark of The Chemours Company. No affiliation or endorsement is implied.
Frequently asked
Is FKM the same as Viton?
FKM is the material family; Viton is Chemours' trademark. A print that says FKM accepts any qualified FKM sheet.
Can Viton gaskets take steam?
No: Parker rates FKM 4 (unsatisfactory) in steam and lists superheated steam among the media it does not resist. EPDM is the usual steam material.
Why not laser-cut Viton?
Laser cutting tends to leave charred, melted or burnt edges on rubber sheet (Stockwell Elastomerics), so Conquest does not laser-cut Viton.
What durometer for a flange gasket?
75 A is the default; 60 A conforms better to rough faces, 90 A resists extrusion under high bolt load or pressure. See the durometer guide.
Related guides
Setting Conquest Seal up as a supplier?
Orders are handled under Conquest Seal's AS9100D quality management system, whose certificate scope includes distribution.
Send the Viton (FKM) gasket drawing and the quantity
A DXF, DWG or PDF of the gasket, the sheet thickness, the durometer and the quantity. Gaskets are cut in our own shop in Orange, California; a Conquest representative replies. Quotes answered within one business day. A person answers (714) 632-9830, Pacific business hours.
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