Seals Eastern molds Viton ® rubber including Viton A, Viton B, Viton GFLT, and Viton ETP (Extreme) into o-rings, gaskets, and other mission critical seals. Generally speaking, products molded using Genuine Viton elastomers provide exceptional resistance to heat, oils, and chemicals.

Seals Easterns formulated Viton ® elastomers can be utilized in seals, o-rings, gaskets, packings and other applications where thermal stability and chemical resitance is required. Seals Eastern has solved sealing problems using Viton ® polymers since 1960.

D1418 Class	Duro	Compound	Description
FKM
(Type 1) Viton A	60	5722A	Excellent mechanical properties. Good extrusion resistance. Chemical and heat resistant.
	65	5753	Chemical and heat resistant.
	75	7040	Chemical and heat resistant.
	85	7042U	Excellent mechanical properties. Good extrusion resistance. Chemical and heat resistant.
	90	7042	Chemical and heat resistant.
(Type 2) Viton B	60	5722	Maximum retention of elastic properties. Excellent resistance to fluids and heat aging.
	75	5723	Maximum retention of elastic properties. Excellent resistance to fluids and heat aging.
	85	5724	Maximum retention of elastic properties. Excellent resistance to fluids and heat aging.
	95	5725	Maximum retention of elastic properties. Excellent resistance to fluids and heat aging.
(Type 3) Viton GFLT	70	5787	Exceptional resistance to oils, organic fluids, steam, inorganic acids and other aqueous media. 69% Fluorine terpolymer.
	75	5794	Low temperature Service. Excellent resistance to fluids and heat aging.
	80	5788	Exceptional resistance to oils, organic fluids, steam, inorganic acids and other aqueous media.
	90	5795	Low temperature Service. Excellent resistance to fluids and heat aging.
FEPM
Viton ETP	80	7265D	Viton Extreme - ETP. PMVE/TFE/E composition. Excellent base resistance. Resistant to aromatic HC's.
	85	7265	Viton Extreme - ETP. PMVE/TFE/E composition. Excellent base resistance. Resistant to aromatic HC's.

NOTE: Viton GF has been discontinued by DuPont.

Most Viton ® elastomers are categorized under the ASTM D1418 designation of FKM. This class of elastomer is further categorized by types. 

• Type-1 FKM:  a copolymer of hexafluoropropylene (HFP) and vinylidene fluoride (VDF or VF2). A Type-1 Viton is generally 66% fluorine by content.
• Type-2 FKM:  a terpolymer of tetrafluoroethylene (TFE), vinylidene fluoride (VDF), and hexafluoropropylene (HFP). A Type-2 Viton is generally 68% fluorine by content.
• Type-3 FKM:  a terpolymer of TFE, Fluorinated vinyl ether and VDF.
• Type-4 FKM:  a terpolymer of TFE, Propylene, and VDF.
• Type-5 FKM:  a pentapolymer of TFE, HFP, VDF, Ethylene, and a fluorinated vinyl ether.

Viton-ETP ®, also referred to as Extreme, is an FEPM class material and additionally offers excellent base resistance since there is no vinylidene fluoride in the composition. 

Do not be fooled by counterfeit "Viton" o-rings that often contain reground material and cheap fluorocarbon copolymers. Cheap imports will deliver inferior performance. Seals Eastern guarantees its Genuine Viton ® seals are made using 100% virgin Viton ® polymers and are post-cured in accordance with DuPont recommendation.