BPI System RS BPI System RS is a two-component spray-applied polyurethane roofing foam that is co-blown with Solstice LBA. Specifically designed for roofing applications that require high-performance in harsh environments. Technical Data Sheet System RSTechnical Data Sheet Version 1.2Revised 6/30/2023 Part A SDS System RS Part ASafety Data Sheet Version 3.0Revised 6/27/2023 Part B SDS System RS Part BSafety Data Sheet Version 1.2Revised 6/30/2022