Specifiers for the industrial processing and power generating industries recognize that stainless steel pipe is susceptible to stress corrosion cracking. Johns Manville's solution is an expanded perlite product with a built-in corrosion inhibitor. Combined with resistance to water absorption, Sproule WR-1200® perlite effectively minimizes corrosion to outer pipe surfaces and equipment while providing excellent thermal insulation.
Sproule WR-1200® is a pre-formed, high-temperature, non-wicking pipe and block insulation. It is composed of expanded perlite that is uniformly reinforced with a high-strength fiber for use on systems operating up to 1200°F (649°C). Sproule WR-1200 is inorganic, non-combustible and meets or exceeds the physical property requirements of ASTM C610. It is produced with XOX Corrosion Inhibitor®, a distinctive formula that inhibits corrosion to outside surfaces of pipe and equipment, especially stress corrosion cracking of austenitic stainless steel. Sproule WR-1200 is blue in color to ensure it can be identified as asbestos-free.