Heat resistance, water resistance and bin storage stability in CSM hose compounds

Achieving optimum heat and water resistance in chlorosulfonated polyethylene (CSM) based compounds has usually required the use of lead containing materials as acid acceptors. Bin storage stability, or specifically poor or marginal bin stability, can be an issue with some CSM formulations under hot, humid storage conditions. This paper discusses results showing hydrotalcite is a suitable replacement for lead in heat and water-resistant CSM formulations. It also discusses ways to compound CSM for improved bin stability and the use of maleated polybutadiene resins as mill release agents having minimal impact on bin stability.