... :1mts Sodium Tripolyphosphate(STPP/FCC IV)Properties: White microdot powder with luster, melting point at 622Deg. C, easily soluble in ... water, with remarkable chelating ability to some metal ions such as Ca2+, Mg2+, can soften hard water ... away from water, moisture and sunlight during transport, handled with care, so as to avoid damage to plastic bags. Furthermore, it should ...