What are FKM O-rings?
FKM Rubber Material O-Ring Seals FKM is a copolymer made of highly fluorinated hydrocarbons and developed during the 1950s. FKM seals display very good resistance to media, ozone and aging. The material is also stable in fuels as well as petroleum-based oils and greases, along with aliphatic and aromatic hydrocarbons. Fluorocarbon rubber has a tensile strength of 10 MPa, higher than silicone, making it an ideal choice for high-force, high-pressure applications. In general, the chemical structure of FKM makes it an ideal material for applications that require strong chemical compatibility with hydrocarbons, oils and fuels/petroleum.FKM is an abbreviation of Fluorkautschukmaterial (i. All FKMs contain vinylidene fluoride as the common monomer, to which different other monomers are added for specific types and functionalities, fitting the desired application.FKM (Fluoroelastomer) is a type of synthetic rubber known for its excellent resistance to chemicals, oils, and heat.Disadvantages of FKM Higher cost than other non-fluorinated hydrocarbons. Not as chemically resistant as FFKM to chemicals but still excellent for most applications. Smaller temperature range than FFKMs but still better than other elastomers. Choosing the wrong FKM for an application can lead to rapid failure.
What is the hardest O-ring material?
Polyurethane is the toughest O-ring material when it comes to abrasion, tear, and extrusion resistance. For extreme temperatures or chemicals, FKM and HNBR offer great toughness in different environments. Choose based on your application’s most demanding requirement. Urethane (Polyurethane) is a highly durable elastomer, known for its excellent resistance to wear, tear, and abrasion. It’s particularly useful in applications that involve high pressure or harsh environments. Urethane O-rings can handle hydraulic fluids, oils, and a variety of chemicals.
What are cheap O-rings made of?
Cheap O-rings are typically made of NBR (nitrile rubber), EPDM, or sometimes silicone—materials that are widely available, easy to produce, and sufficient for basic sealing needs. The O-ring NBR, also known as a nitrile o ring, is a synthetic elastomer produced by the copolymerization of butadiene and acrylonitrile. This entire process results in a material that is strong and flexible. It also makes the material resistant to oils, greases, and hydrocarbons.Nitrile, a synthetic rubber composed of acrylonitrile (ACN) and butadiene, remains an industry-standard sealing material for O-rings due to its balance of performance, affordability, and chemical resistance.Nitrile (NBR) Nitrile is a popular O-ring material due to its excellent resistance to oil, fuel, and other petroleum-based fluids. It can withstand a temperature range of -40°C to +120°C and has good tensile strength and tear resistance.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.