Calcium thiosulfate

Calcium Thiosulfate (CaS2O3) is primarily used as a high-solubility liquid fertilizer in agriculture and as a dechlorinating agent in water treatment. In farming, it serves as a dual source of calcium and sulfur, helping to improve soil structure and nutrient uptake without increasing soil salinity. It is also highly effective in neutralizing residual chlorine in industrial wastewater and protecting sensitive RO membranes.

Buyers must verify the concentration levels, typically sold as a 6% Calcium and 10% Sulfur (12% Thiosulfate) liquid solution. Key parameters include a pH range of 6.5 to 9.0 and a specific gravity of 1.20 to 1.30. For industrial applications, ensure the insoluble matter content is <0.05% to prevent clogging in irrigation systems or industrial nozzles.

Suppliers must provide a valid Material Safety Data Sheet (MSDS) and a Certificate of Analysis (COA) for every batch. For agricultural use, check for REACH registration if exporting to the EU, and ensure the product meets heavy metal limit standards (Lead, Arsenic, Cadmium) to comply with local environmental regulations. If used in water treatment, NSF/ANSI 60 certification may be required for potable water applications.

To optimize costs, calculate the price per unit of active nutrient rather than just the total volume. Bulk purchasing in IBC tanks (1000L) or Flexitanks usually reduces packaging costs by 15-20% compared to 20L drums. Always factor in the shelf life (typically 6-12 months) to avoid losses from crystallization or degradation during long-term storage.

The primary risks include leakage during transit and temperature-induced crystallization. Ensure the supplier uses UN-approved packaging and provides stowage instructions to keep the product away from acids, as contact with acids releases toxic sulfur dioxide gas. We recommend using Made-in-China.com's audited supplier services to verify the manufacturer's hazardous material handling capabilities.

Always insist on Trade Assurance or Letter of Credit (L/C) for first-time orders to protect your funds. Negotiate a retention payment (typically 10%) to be released only after a third-party pre-shipment inspection (like SGS or Intertek) confirms the chemical purity and concentration meet the agreed specifications.

Calcium Thiosulfate is generally classified as non-hazardous for transport under IMDG codes, but this must be confirmed by the supplier's Certification for Safe Transport of Chemical Goods. Use FCL (Full Container Load) shipping to minimize handling risks, and ensure the container is positioned 'Away from Heat' on the vessel to maintain chemical stability.