AFLAS

AFLAS is a trade name used for a class of fluorosilicone elastomers (FVMQ). These elastomers combine a silicone (siloxane) backbone with fluorinated side groups, yielding materials that retain silicone-like flexibility at low temperatures while offering improved chemical and fuel resistance. AFLAS is marketed by several manufacturers under the AFLAS branding, and the term is commonly used to describe fluorosilicone elastomers designed for demanding environments.

Typical properties include a broad operating temperature range, roughly from well below freezing to around 200°C for continuous use, with higher-temperature performance possible in some grades. AFLAS elastomers generally provide good resistance to automotive fuels, oils, and many solvents, and they exhibit better ozone and weather resistance than many other elastomers. They often maintain flexibility at low temperatures and offer moderate electrical insulating properties. However, they may show limited resistance to certain aromatic hydrocarbons and some ketones, and they can have lower abrasion resistance and higher material costs compared with more common elastomers such as silicone or fluorocarbons.

Processing and compatibility considerations include cure systems that may differ from standard silicone rubbers, with peroxide- or platinum-catalyzed formulations being used depending on the grade. Bonding to metals and other substrates can require surface preparation or primers. AFLAS elastomers are commonly used in o-rings, gaskets, seals, and other components exposed to fuels, lubricants, or high-temperature environments in automotive, aerospace, and chemical-processing industries.

In summary, AFLAS refers to fluorosilicone elastomers valued for fuel and chemical resistance, temperature performance, and silicone-like flexibility, serving specialized sealing and gasket applications where harsh fluids and heat are present.