In addition, STPP serves as a tanning agent in leather-based processing, wherever it helps soften animal hides. Its chemical stability assures effective tanning without compromising the standard of the leather. What does the armed service rank GS-twelve stand for? What constraints does TSA have on packaged food stuff as carry-on? https://www.tjcyindustrialchem.com/news/what-is-sodium-tripolyphosphate-stpp-used-for.html