Perlite is not listed as a carcinogen by IARC, NTP, ACGIH, OSHA, or California Prop.

Is perlite toxic to humans?

Perlite is a naturally occurring silicous rock and as such, is not toxic. Perlite is used in horticultural, construction and industrial applications. Ingesting the products that incorporate perlite may cause illness and, in excessive amounts, permanent harm or death.

Is perlite a hazardous material?

Perlite is not specifically listed in the OSHA List of Hazardous and Toxic Substances (Hazard Communication Standard 29 CFR 1910.1200) but products are classified by ACGIH as a “Nuisance Dust” or “Particulates Not Otherwise Classified” (PNOC).