MIL-S-48112, MILITARY SPECIFICATION, SEALING COMPOUND BUTYL RUBBER SEALANT (FOR USE IN AMMUNITION) (16 JUL 1972)., This specification covers a type of Butyl Rubber Sealant (Caulk). The material is a single component, solvent release type, butyl rubber based sealing compound for sealing and caulking operations for use in ammunition items (see 6.3).