For food grade,sodium tripolyphosphate is mainly used as quality improvement agent.For tech grade,it’s used as additive in synthesizing detergent process,and can also used in other industry field.Please check the stardard:

Main content:94pct min.

Phosphorous pentoxide:57pct min

Iron as Fe:0.01pct max

Arsenic as As:3ppm max

Heavy metal as Pb:10ppm max

Fluoride as F:50ppm max

Size(through 20 mesh sieve):95pct min

PH value:9.2-10.0

Water insoluble:0.15pct max

Whiteness:90min

Type I:28pct min.

Density:0.66-0.9g/cm3