Buna-N is the most common choice for its durability and resistance to oils, fuels, and water.
This food grade material is often used for its wide temperature range and purity. Silicone has excellent resistance to UV, chemicals, mild oils, and water.
Excellent resistance to water, steam, UV light, and chemicals with a broad temperature range.
Often used with refirgerants and in outdoor applications, Neoprene is a good multipurpose material with resistance to water, mild chemicals, oils, and UV light