Alums are a type of salt composed of aluminium sulfate and other ions. They are commonly used in water treatment, as an additive to fire fighting foams, in leather tanning and for dyeing and printing textiles. When rubber is exposed to alums, the rubber can be weakened as a result of the acidic nature of the alum. In addition, the alum can cause the rubber to harden and crack, leading to premature failure.
Viton ® o-rings from Marco Rubber offer excellent compatibility with a range of chemicals, oils and resist high temperatures up to 400F. Viton ® is also known as FKM made of fluoroelastomer one of the most versatile and widely used sealing materials.
View some of our other material compatibility ratings with ALUMS. If you don't see what you're looking for or need more guidance, our team of experienced sealing design engineers can help select the best sealing products and material for your specific application.View Full Chemical Compatibility Guide