Sodium sulfide 60% flakes

Buyers must prioritize the purity level (minimum 60% Na2S) and monitor the Iron (Fe) content, which is the primary quality differentiator. For high-end textile or leather applications, look for 'Low Iron' variants (typically <30ppm or <10ppm) to prevent staining. Additionally, verify the water-insoluble matter percentage, which should ideally be below 0.2% to ensure complete solubility in industrial processes.

Sodium Sulfide is a versatile chemical used extensively in the Leather Industry for dehairing hides, the Textile Industry as a bleaching and dechlorinating agent, and in Mining for ore flotation (specifically copper and gold). It is also a critical component in Water Treatment for heavy metal removal and in the production of Sulfur Dyes.

As a Class 8 Corrosive Substance (UN 1849), the product must be accompanied by a comprehensive Material Safety Data Sheet (MSDS). Ensure the supplier complies with REACH regulations for European markets and provides COA (Certificate of Analysis) for every batch. Packaging must meet UN-certified standards, typically using 25kg or 1000kg double-layer PP/PE bags to prevent moisture absorption and oxidation.

Standard 60% flakes are usually yellow or reddish due to the presence of iron. Yellow flakes generally indicate a lower iron content compared to red flakes. However, if the flakes appear dull or brownish, it may indicate oxidation or high impurity levels, which can reduce the effective chemical activity during production.

The biggest risk is moisture absorption (deliquescence) and spontaneous combustion if exposed to air and moisture. Ensure the supplier uses vacuum-sealed inner liners. From a regulatory standpoint, ensure the supplier has a 'Dangerous Goods Export License'; without this, the cargo may be seized at the port of exit or rejected by the shipping line.

Focus on Tiered Pricing based on tonnage and request a Pre-shipment Inspection (PSI) by third parties like SGS or Intertek. Negotiate for free samples (500g-1kg) but be prepared to pay for hazardous material air courier costs. Always confirm the validity period of the quoted price, as chemical raw material markets are highly volatile.

Sodium Sulfide must be shipped in GP containers with proper Dangerous Goods (DG) labeling on all four sides. It is mandatory to provide a Dangerous Goods Declaration to the carrier. For sea freight, ensure the container is placed in a well-ventilated area away from heat sources on the vessel to prevent chemical instability during transit.

Utilize Secured Payment services provided by Made-in-China.com to ensure funds are only released upon proof of shipment (Bill of Lading). For first-time orders, consider a Letter of Credit (L/C) for large volumes to mitigate financial risk and ensure the supplier adheres strictly to the technical specifications outlined in the contract.