Bromine (or bromide) is a chemical element with symbol Br and atomic number 35. It is a halogen and is a liquid at room temperature. Common uses of bromine include fire retardants, water treatment, and oil production. It is also used in pharmaceuticals, agriculture, and semiconductors.
When rubber is exposed to bromine, it can harden and become brittle over time, as well as become discolored or cracked. In extreme cases, bromine can cause rubber to swell, crack, and break down completely. In addition, bromine can cause rubber to become tacky or greasy, and can cause it to lose its flexibility.
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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