FC 32 is commonly referred to as Perfluorooctanesulfonic acid (PFOS) and is a fluorinated surfactant used in a range of applications such as firefighting foams, oil and water repellents, stain-resistant coatings, and manufacturing of electronics.
When rubber is exposed to PFOS, it can lead to swelling, cracking, and accelerated degradation of the rubber. Additionally, the rubber may become brittle and, in some cases, swell to the point of failure. With prolonged exposure, the rubber can become brittle and suffer from accelerated degradation, leading to premature failure.
Buna-N o-rings also referred to as NBR o-rings and Nitrile o-rings are the most widely used o-ring material in the word because of low cost, good mechanical performance with resistance to water, most basic oils, lubricants and some fuels, many pneumatic, hydraulic systems, and the default choice for basic applications. Buna-N o-rings are not recommended for exposure to sunlight, UV light, ozone and general outdoor weathering or hash chemicals, acids, keytones and many others.
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