Potassium Aluminium Silicate
The short version
A potassium-based aluminosilicate — niche anti-caking agent, structural cousin of E554.
It's permitted and generally considered safe, but there are a few reasons to be mindful — like sensitivities in some people, debated studies, or intake limits. The Safety section below explains the specifics.
Safety profile
JECFA allocated no ADI for potassium aluminium silicate (2014). Its provisional tolerable weekly intake of 2 mg/kg body weight for total aluminium (2011) applies to all aluminium compounds in food, including additives. EFSA (2008) set a tolerable weekly intake of 1 mg/kg body weight per week for aluminium. Same considerations as E554.
Sources
- JECFA database: Potassium aluminium silicate (INS 555), evaluations 1985 and 2014 — WHO / FAO Joint Expert Committee on Food Additives, 2014. No ADI allocated; PTWI 2 mg/kg bw for total aluminium
- Commission Regulation (EU) No 380/2012 of 3 May 2012 on aluminium-containing food additives — European Commission (EUR-Lex), 2012. EFSA TWI for aluminium; E 555 dropped from the silicate group from 1 Feb 2014
- Regulation (EC) No 1333/2008, consolidated text of 18.08.2026: Annex III entry for E 555 — EUR-Lex, 2026. Only remaining EU use is as a carrier in E 172
Checked against these sources on .
Educational information only. Not medical, dietary or veterinary advice. Spotted an error? Tell us.