ST Request a Quote Email usrxmarinegroup @ gmail.com DocumentsRequest MSDS / TDS Lab Chemical-60 SODIUM TRI POLYPHOSPHATE ANHYDROUS STPP Product code RXSOL-60-6605-585 SODIUM TRI POLYPHOSPHATE ANHYDROUS STPP Request a Quote Email Us STPP is a colorless salt, which exists as anhydrous and also as hexahydrate. Its wide spread use is well known in detergent industries.