RS-B4CN Pre Cured Black Bromobutyl Blend made from bromobutyl/Natural Blend polymers. It combines the properties of good heat resistance, diffusion resistance to gases such as nitrogen oxides, sulfur dioxide, and saturated water vapors.It also has very good resistance to corrosive acids , mineral, bases, aqueous phases, polar solvents and alkalies, while still retaining a moderate abrasion resistance. It has excellent resistance to ozone and outdoor weathering effects, and suitable for use with a range of chemicals including oxygenated solvents and hydraulic fluid. Suitable for most applications where high acid, chemical or temperature resistance is required. Available with a bonding layer.