Seals Eastern, Inc.

Our portfolio of field tested fluorelastomers (also known as fluoro-rubber or FKM) can be utilized in seals, o-rings, gaskets, packings and other applications where thermal stability and chemical resitance are required. If your seals exhibit thermal or chemical degradation, we can help you by analyzing your failures and recommending the appropriate grade of fluoroelastomer to solve your problem. Let us be your trusted engineer: we have been solving sealing problems with fluorelastomers since 1960.

Seals Eastern has experience formulating and molding all grades of premium quality Viton^TM fluorelastomers, including other leading brands such as Technoflon^TM. As a general rule, fluoroelastomers provide exceptional resistance to heat, oils, and chemicals by substituting the hydrogen atoms in the polymer with Fluorine atoms. As a result, our fluoro-rubber formulations deliver a broad range of chemical resistance, continuous service temperatures of 400F, and low temperature capabilities down to -35F. All of our custom formulated rubber is mixed and molded in our Red Bank, NJ factory using systems certified to ISO-9001 and ISO-14001.

D1418 Class	Duro	Compound	Description
FKM
(Type 1) BPAF Cure	60	5722A	Excellent mechanical properties. Good extrusion resistance. Chemical and heat resistant.
	75	7040	Chemical and heat resistant.
	80	7155	For mechanically demanding jobs; Chemical and heat resistant.
	90	7042	Chemical and heat resistant.
(Type 2) BPAF Cure	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.
(Type 2) Peroxide Cure	75	7235	Ultra-low compression set; Excellent resistance to fluids and heat aging.
(Type 2) Peroxide Cure	80	7245	Ultra-low compression set; Excellent resistance to fluids and heat aging.
	92	7248	Ultra-low compression set; RGD / ED resistant FKM rubber: ISO-23936-2 certified; Extrusion resistant; Excellent resistance to fluids and heat.
(Type 3) Viton GFLT	75	5794	Low temperature Service. Excellent resistance to fluids and heat aging.
	90	5795	Low temperature Service. Excellent resistance to fluids and heat aging.
FEPM
ETP-600S	80	7265D	VitonTM ExtremeTM - ETP. PMVE/TFE/E composition. Excellent base resistance. Resistant to aromatic HCs.
	85	7265	Viton Extreme - ETP. PMVE/TFE/E composition. Excellent base resistance. Resistant to aromatic HCs.
AFLAS	xx	Aflas Rubber	Visit our selection of premium quality Aflas compounds

Most fluoroelastomers are categorized under the ASTM D1418 designation of FKM (the DIN/ISO counterpart to this designation is FPM). 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 for low temperature performance.
• 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.

FEPM class polymers offer the chemical resistance and thermal stability of FKM class flouroelastomers and additionally offer excellent base resistance since there is no vinylidene fluoride in the polymer.

Do not be fooled by ultra-low cost fluoroelastomer o-rings since they often contain reground material and inferior fluorocarbon copolymers. Cheap imports will deliver inferior performance. Seals Eastern guarantees its fluorelastomer seals are made using 100% virgin fluoro-polymers from brand name producers and are post-cured in accordance with the manufacturers' recommendation.

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