... (STPP)Chemical formula: Na5P3O10 Molecular weight: 367.86 Standard executed: GB9983-88 PropertiesWhite microdot powder with luster, melting ... metal ions such as Ca2+, Mg2+, can soften hard water, change suspension into solution, slightly alkaline, without causticity. ... as main auxiliary of synthetic wash, soap synergistic agent, water softener, leather pre-tanning agent, dye auxiliary agent, and ...