Sodium sulphate

Selecting the correct grade is critical for process efficiency. For the detergent industry, prioritize Anhydrous Sodium Sulphate with a whiteness level above 92% and low moisture content to prevent caking. In glass manufacturing, a low iron content (Fe < 0.002%) is essential to ensure clarity. For textile dyeing, look for neutral pH (6-8) and high purity (Na2SO4 ≥ 99%) to ensure uniform dye uptake and prevent fabric damage.

Buyers should demand a Certificate of Analysis (COA) for every batch. Key parameters include Purity (typically 99% min for anhydrous), Chloride content (Cl ≤ 0.3%), and Magnesium/Calcium ions (Mg2+/Ca2+ ≤ 0.15%). Ensure the product complies with industrial standards like GB/T 6009-2014 (China's national standard) or equivalent international benchmarks to guarantee chemical stability.

Sodium Sulphate is hygroscopic. Ensure the supplier uses PP/PE woven bags with an inner plastic liner to prevent moisture absorption. Standard packaging includes 25kg, 50kg, or 1000kg jumbo bags. Storage must be in a cool, dry, and well-ventilated area; for cross-border shipping, verify that the container flooring is dry to avoid clumping during long-sea transit.

As chemical production is strictly regulated, verify that the supplier holds an ISO 14001 Environmental Management certification. Inquire about their waste-water treatment capabilities and whether the product is a by-product of other chemical processes (like viscose fiber or lithium salt production), which can often be more cost-effective and sustainable.

The main risks include quality inconsistency and weight shortages. To mitigate these, use third-party inspection services like SGS or Intertek to perform Pre-Shipment Inspection (PSI) at the loading port. Ensure the contract specifies allowable weight tolerance (usually +/- 5%) and use Secure Payment terms or Letters of Credit (L/C) to protect your capital until documents are verified.

Sodium Sulphate is generally classified as non-hazardous for transport, but you must provide a Material Safety Data Sheet (MSDS) and a Non-Hazardous Chemical Certificate for customs clearance. When sourcing from China via Made-in-China.com, confirm the HS Code (typically 283311) with your broker to determine the exact import duties and VAT applicable in your destination country.

Chemical prices fluctuate with raw material costs and energy prices. Negotiate based on volume-based pricing tiers; for example, ordering a full container load (FCL) usually reduces the unit price by 10-15% compared to LCL. Request a price formula tied to market indices if you are establishing a long-term supply contract to ensure transparency.

Always conduct a supplier audit. On Made-in-China.com, look for Audited Suppliers who have undergone on-site verification by independent agencies. Check their business license, export permit, and past shipment records. Avoid making full payments upfront; a standard industry practice is 30% T/T deposit and 70% against the Bill of Lading (B/L) copy.