CAS 1344-09-8 · TSCA · United States of America

Sodium silicate (waterglass) under TSCA

Na2O.nSiO2 (n typically 2.0 to 3.3) · 硅酸钠

Status: Listed. Sodium silicate is on the TSCA Inventory and currently listed as TSCA Active. **No OSHA PEL specifically listed for sodium silicate at 29 CFR 1910.1000 Table Z-1 (verify against https://www.osha.gov/annotated-pels); the OSHA Particulates Not Otherwise Regulated (PNOR) framework provides 15 mg/m3 total dust + 5 mg/m3 respirable as default for solid grade.** NOT on EPA RMP threshold list. NOT on DEA scheduling. NOT on California Proposition 65 (verify against OEHHA https://oehha.ca.gov/proposition-65/proposition-65-list before relying on negative listing). NO active US AD/CVD case on Chinese-origin sodium silicate currently (verify against https://access.trade.gov/ before invoicing). Section 301 List 3 25% additional duty applies on Chinese-origin sodium silicate (HS 283919) (verify against current USTR Section 301 schedule before invoicing). USP / NF monograph applies for pharma-grade colloidal silica derivative. Major US domestic producers (verify each company-site pair against the producer's public website before relying): PQ Corporation (now Ecovyst) Valley Forge Pennsylvania headquarters with multiple US plants, Sodium Silicate Corp (Occidental Chemical) multiple US sites, Industrial Solutions (formerly Inland Silicates) operations.

US sodium silicate lane: **No OSHA PEL specifically listed (PNOR framework default) + Section 301 List 3 + USP / NF for colloidal silica derivative + Class 8 PG III at concentrated liquid grade**. NOT on Cal Prop 65. NO active US AD/CVD case. Major US producers: PQ Corporation / Ecovyst (Pennsylvania + multiple US plants), Sodium Silicate Corp / Occidental Chemical, Industrial Solutions.