Technical Foundation
What Is a Viton Tubing?
Viton is a DuPont trade name for fluoroelastomer (FKM) rubber, prized for chemical resistance and high-temperature stability well beyond general-purpose rubber compounds like EPDM or nitrile. FKM tubing resists a broad range of fuels, oils, hydraulic fluids and many aggressive solvents that would swell or degrade standard rubber tubing, and it holds up continuously at temperatures up to roughly 400°F (some compounds higher), making it the standard choice for hot chemical transfer lines and high-temperature seal applications.
Not all FKM is identical — different Viton grades (A, B, F, GF and others) trade off chemical resistance, low-temperature flexibility and cost differently, so the exact compound should be checked against the specific chemical media, not assumed interchangeable. Viton tubing is notably less flexible at low temperatures than silicone or EPDM, so it's a poor choice for cold-ambient or cryogenic-adjacent applications despite its excellent high-temperature and chemical performance.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Inner Diameter (ID) | Common range 1/16 in to 2 in | Must match fitting/barb OD for a proper seal without excessive stretch |
| Wall Thickness | Typically 1/16 in to 1/4 in | Thicker walls improve pressure rating and abrasion resistance, at the cost of flexibility |
| Durometer (Hardness) | Commonly 70-90 Shore A | Higher durometer improves chemical/pressure resistance but reduces flexibility |
| Temperature Rating | Continuous service typically to ~400°F | Exceeding rated temperature accelerates hardening and cracking of the compound |
| Chemical Compatibility | Grade-dependent (A, B, F, GF compounds) | Different FKM grades resist different chemical families — verify against the specific media |
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Applications
Where Viton Tubing Get Used
Viton tubing is specified wherever chemical resistance or sustained high temperature rules out standard rubber compounds like EPDM or nitrile.
Chemical Processing & Transfer
FKM tubing routing aggressive solvents, acids and process chemicals resistant to swelling or degradation.
Fuel Systems & Automotive
Fuel-resistant Viton tubing in fuel lines, vapor recovery lines and emissions system connections.
High-Temperature Industrial Equipment
Continuous-duty Viton tubing on equipment operating well above the service range of standard rubber compounds.
Oil & Gas Processing
Chemically resistant tubing handling hydrocarbons, lubricants and process fluids in refining and processing equipment.
Laboratory & Analytical Instrumentation
Small-diameter Viton tubing for chemical-resistant fluid transfer in lab and analytical equipment.
Pharmaceutical & Chemical Manufacturing
FKM tubing specified where chemical compatibility with process media is a hard requirement over cost.
FAQ
Viton Tubing Questions, Answered
What makes Viton (FKM) different from EPDM or silicone tubing?
Viton offers significantly better resistance to fuels, oils, hydraulic fluids and many solvents than EPDM or silicone, and it holds up at higher continuous temperatures (commonly to around 400°F). The trade-off is reduced low-temperature flexibility — EPDM and silicone remain flexible in cold conditions where Viton stiffens and can crack.
Are all Viton compounds chemically equivalent?
No — different FKM grades (commonly designated A, B, F, GF) offer different chemical resistance profiles, with some grades formulated for better resistance to specific chemical families like ketones or amines that standard FKM struggles with. Always check compatibility against the specific chemical media rather than assuming all Viton tubing performs identically.
Can Viton tubing be used in cold or outdoor winter applications?
Viton has relatively poor low-temperature flexibility compared to silicone or EPDM, and can become stiff or brittle at low ambient temperatures, so it's generally not the first choice for cold-climate outdoor use unless the specific compound's low-temp rating has been confirmed. For cold applications, silicone tubing is often a better fit if chemical resistance requirements allow it.
How do I choose the right wall thickness for Viton tubing?
Thicker walls improve pressure rating, abrasion resistance and durability under mechanical stress, but reduce flexibility and increase cost — thin-wall tubing suits low-pressure, static transfer lines where flexibility for routing matters more. Match wall thickness to both the system's operating pressure and how much the tubing needs to bend during installation.
Is Viton tubing resistant to fuel and automotive fluids?
Yes, FKM is one of the standard compounds for fuel line and automotive fluid resistance, handling gasoline, diesel and many automotive oils without significant swelling or degradation over standard rubber. It's commonly specified for fuel systems and vapor recovery lines where nitrile or EPDM would degrade faster.
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