Sourcing Thioglycolic acid sodium salt (CAS 367-51-1) - 1 Ton every 6 months

We are looking for a reliable manufacturer/supplier for the following chemical product: Product: Thioglycolic acid sodium salt (CAS No. 367-51-1) Application: Rust remover Appearance: White Powder Purity: ≥ 98% or ≥ 99% Quantity: 1 Ton every 6 months CRITICAL REQUIREMENT: Heavy Metal content must be extremely low. Specifically, the Pb (Lead) content MUST be strictly less than 1 ppm (< 1 ppm). QUOTATION REQUIREMENTS: Please provide a CIF Incheon quotation based on 1 Ton, along with the Spec Sheet and MSDS.