IS 9901 covers rubber lining of steel equipment for chemical corrosion protection. Different rubber types resist different chemicals: natural rubber for dilute acids, neoprene for oils, butyl rubber for concentrated acids. Used extensively in chemical, pharmaceutical, and fertilizer industries.
Code of practice for natural and synthetic rubber lining of steel tanks, vessels, and equipment for corrosion protection in chemical industries.
Key Values
Natural rubber operating tempMax 80°C
Neoprene operating tempMax 90°C
Butyl rubber operating tempMax 120°C
Practical Notes
! Steel surface must be blasted to Sa 2.5 (near-white) before rubber application — adhesion depends entirely on surface prep.
! Spark testing at 5-10 kV must be done over entire lined surface to detect pinholes.
! Natural rubber resists most dilute acids and alkalis but NOT concentrated sulfuric acid or oils.
! Butyl rubber is the best general-purpose chemical-resistant lining material.