If you buy Viton or other FKM gaskets, you have probably seen PFAS come up in a supplier notice or a customer questionnaire. Most of it reads like a legal memo. This post is the short, practical version: where fluoroelastomers sit in the conversation, what to check on your own parts, and which PFAS fluoroelastomer gasket alternatives hold up on heat and chemicals.
We are a rubber supplier, not a regulator or a law firm. Confirm anything with your compliance people. What we can speak to is what the materials do.
Where Viton and FKM sit in the PFAS conversation
FKM is a fluoroelastomer. Viton is a brand name for it. Fluorinated polymers like this fall inside the broad PFAS definitions that regulators use, which is why they keep showing up in these discussions. That does not mean a Viton gasket is banned. It means the material is on the list of things being looked at.
The rules are still moving, and they differ by region. Two items worth knowing:
- United States, TSCA reporting. The EPA's one-time PFAS reporting rule under TSCA Section 8(a)(7) has been postponed. As of the EPA's April 2026 announcement, the submission period opens January 31, 2027, or sooner if a revised final rule lands first. EPA has also proposed exempting imported articles. Check the current status before you assume either way, because it may have changed.
- European Union, ECHA. The agency's risk committee adopted its opinion in March 2026. The socio-economic committee's draft opinion went out for public consultation, and its final opinion is expected around the end of 2026. Sealing-industry groups such as the European Sealing Association have argued that fluoropolymer seals are hard to replace in long-life, demanding service.
Neither of these is a blanket ban on FKM gaskets today. If you sell into the EU, or your customers do, the draft is the one to watch.
What to check on your own gasket list
Start with a simple audit. You do not need a consultant for the first pass.
- List every part that is Viton, FKM or fluoroelastomer, including O-rings, gaskets and seals.
- Write down why each one is Viton. Is it chemicals, temperature, or just habit from an old drawing?
- Note where each part ends up: your own plant, a U.S. customer, or an export market.
- Ask your customers whether they have PFAS requirements. Some do before any law requires it.
- Ask your suppliers where the compound comes from. Import status matters for the reporting rules above.
Step two is the useful one. In our experience at the cutting table, a good share of fluoroelastomer specs are written to be safe rather than because the service demands it. Some of them do demand it. Sorting the two groups is the real work.
When Viton is still the right call
Viton earns its price in a few places. It runs to 540°F, well past what the other stocked compounds handle. It is the usual choice for hot oil, fuels and many aggressive chemicals. If your gasket sits in that kind of service, do not swap it because of a headline. Look for a PFAS-free option only if a customer or a regulation requires it, and then test the replacement in the real application.
EPDM: when water, steam or weather is the issue
EPDM runs from -40°F to 270°F. That covers hot water, many steam jobs, outdoor exposure and a lot of cleaning chemicals. If your Viton gasket is in a water-based or outdoor application, EPDM is the first thing to look at. The catch: EPDM does not tolerate petroleum oils and fuels. Put it in contact with those and it swells and fails.
Nitrile: when oil is the issue
Nitrile is rated -30°F to 250°F and is the standard answer for oils, many fuels and hydraulic fluids. If a Viton gasket was specified for oil contact at moderate temperature, nitrile often does the job. It ages faster than EPDM in sun and ozone, so it suits enclosed parts better than exposed ones. Above its temperature ceiling it is the wrong tool.
Silicone: when heat is the issue
Silicone is stocked to 430°F. That is the best fit when heat is the reason for the Viton, and the fluid is not oil. It is non-toxic and odorless, and we sell it for food and beverage use. It is softer and tears more easily than the others, and it does not suit petroleum contact. We do not make FDA claims for it. If you need a specific food-contact standard, get it in writing from your end customer.
A quick way to sort it
- Hot oil or fuel above 250°F: Viton is likely still the answer.
- Moderate-temperature oil: look at nitrile.
- Water, steam, weather, mild chemicals: look at EPDM.
- High dry heat, no petroleum: look at silicone.
This is a starting point, not a spec. Chemical compatibility depends on the exact fluid, concentration and temperature. Test before you commit, especially on safety-critical seals.
Getting a substitute material quoted
Every roll we sell is made to order in your width, Duro and thickness, from 35 to 85 Shore A. There is no stock list and no price list, so you can ask for a trial piece of EPDM, nitrile or silicone cut to your gasket size rather than buying a large run. Our guide on ordering custom-cut rubber sheet by width, Duro and thickness explains what to have ready. If you need molded or stamped gaskets, custom parts quoted from your drawing go from prototype through production. Sourcing questions also tie into how tariffs are changing Southern California rubber buying, which matters if import status is part of your PFAS question.
If you want to talk through a specific application, call us at (714) 602-6515 or email sales@socalrubber.com, Monday to Friday, 9am to 4:30pm Pacific. Send the width, Duro and thickness you need, plus the fluid and temperature, and we will quote it from there.
SoCal Rubber
Rubber and elastomer supply for the U.S. West Coast since 2021. Rolls, sheets, extrusions and custom-molded parts, cut to your width, Duro and thickness from our Anaheim, CA warehouse. Call (714) 602-6515 or request a quote.
