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Perfluoroelastomers (FFKM, Kalrez®, Markez®, Chemraz®) deliver ultimate chemcial and high temperature resistance, but with a very high cost relative to traditional rubber elastomer sealing materials. Dozens of specialized formulations have been developed to maximize performance in specific application situations like improved low temperature, acid, amines, plasma, steam, food and medical grade, high pressure and explosive decompression resistance.
Fluorocarbon compounds are widely used in chemical, aerospace, and industrial applications. These materials offer excellent chemcial and high temperature resistance. Not recommended for use with steam, amines, or polar solvents. Specialty FKM types and formulations are available for improved low temperature and chemical resistance as well as colors, durometer hardness, food and medical grade, high pressure and explosive decompression resistance.
Aflas® materials exhibit excellent chemical, heat and steam resistance. They have similar properties to FKM, but with increased resistance to bases, amines, sour gasses, steam, and radiation. Aflas® materials can have limited compression set resistance and should not be used with aromatic fuels, ketones, or chlorinated hydrocarbons.
Nitrile rubber materials are the most commonly used general purpose o-ring material because of relative low cost, good mechanical properties, and performance with many basic oils, fuels, and lubricants. Not recommended for use with UV, ozone, steam, harsh fuels or chemicals. Nitrile materials can be formulated to enhance specific physical and chemical resistances like color, durometer hardness, internal lubrication, steam, ozone, high and low temperature performance.
Hydrogenated Nitrile was specifically developed to offer increased temperature and fuel resistance compared to traditional Nitrile (NBR) materials. HNBR compounds also have excellent abrasion, wear, and compression set resistance. Poor resistance to aromatic or chlorinated hydrocarbons, fuels and solvents.
Silicone materials have excellent thermal stability in extreme low and high temperature environments. Silicones have good broad spectrum chemical resistance and are physiologically neutral making them ideal for many food, pharma, and medical applications. Not recommended for dynamic service or for contact with many fuels, mineral oils, or concentrated acids. Silicone can be formulated in a variety colors, durometer hardnesses and variations designed for use in a wide range of demanding specialty applications like medical and EMI shielding.
Fluorosilicone materials are mechanically similar to Silicone (VMQ) but offer increased resistance to fuels and mineral oil at the cost of decreased high temperature resistance. Fluorosilicones have excellent low temperature resistance and are often used in demanding aerospace and automotive applications such as fuel and exhaust systems. Not recommended for dynamic service or for use with concentrated aromatic solvents, amines, esters, and ketones.
Ethylene-Propylene rubber materials are characterized by excellent chemical, steam and thermal resistance for a relative low cost. Often used in food, water, beverage and agricultural systems, hydraulic, braking, steam applications. Not recomended for use with oils and fuels. EP can be formulated in a variety of ways for use in a wide range of demanding specialty applications.
Polyurethane is a type of thermoplastic elastomer that can be formulated in a variety of ways, each yielding very different mechanical properties and resistances. Generally Polyurethanes have excellent wear and abrasion resistance, good weathering resistance, and moderate resistance to oils and lubricants depending on formulation. Not recommended for use in demanding chemical or thermal environments.
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Service Temperature Range
|Material Family||Relative Price||Low Temp. Range, °F||Abbv.||High Temp. Range, °F||Compr. Set||Oils||Steam||Weather/
|FFKM Perfluoro (Markez®, Kalrez®, etc)|
|Buna-N (NBR Nitrile)|