... .White odorless powder 4.Over 50 years factory Tech Grade Sodium Tripolyphosphate (STPP) SpecificationTech grade Main content, %,≥96.094.090.0 P2O5 %≥57 ... oil field, paper-making, textile, dyeing, petrochemical industry, tanning industry, metallurgical industry and building material industry, and used as a water softening agent in ...