Concentrated nitric acid, also known as aqua fortis and spirit of niter, is a highly corrosive and oxidizing mineral acid. It is often used in industrial processes such as metalworking, for producing fertilizers, explosives, and dyes, and for pharmaceutical applications.
When rubber is exposed to concentrated nitric acid, the corrosive properties of the acid can cause rapid degradation of the material. This can lead to swelling, hardening, cracking and loss of elasticity, which can lead to eventual failure of the rubber seal. Different rubber types have different levels of resistance to nitric acid, and so it is important to select the correct material for the application. Natural rubber is particularly prone to degradation when exposed to this chemical, and so should be avoided where possible.
Markez ® high performance perfluoroelastomer O-Rings (FFKM) offer unmatched value for demanding sealing applications. Produced from nearly identical ingredients as higher priced brands, Markez ® compounds are used for high temperature o-rings and high pressure o-rings and chemical resistant o-rings that deliver similar performance to major FFKM brands, with temperature resistance up to 625oF, at a significantly lower cost. Our proprietary processing allow us to supply seals under an inch in size more efficiently. Introduced exclusively to existing customers over 15 years ago, we now have the experience and capacity to offer Markez ® high temperature o-rings and high pressure o-rings to the world.
View some of our other material compatibility ratings with NITRIC ACID, CONCENTRATED. 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