Sodium sulphide

Buyers must prioritize the purity level, typically categorized as 60% Min (Yellow Flakes) or Red Flakes. For high-end applications like leather tanning or textile dyeing, low iron content (Fe < 10ppm to 30ppm) is critical to prevent staining. Additionally, verify the water-insoluble matter percentage, which should ideally be below 0.2% to ensure process efficiency.

Sodium Sulphide is a versatile industrial chemical used primarily in leather processing for dehairing, mining (ore flotation) as an activator, and the textile industry for sulfur dyeing. It is also essential in water treatment for heavy metal removal and in the production of polyphenylene sulfide (PPS) plastics.

As a hazardous chemical, it must comply with UN Number 1849 (Hydrated) or UN 1385 (Anhydrous). Suppliers should provide a valid Material Safety Data Sheet (MSDS), REACH certification for European markets, and ISO 9001:2015 for quality management. Ensure the product meets GB/T 10500-2009 standards if sourcing from Chinese manufacturers.

Request a Pre-Shipment Inspection (PSI) conducted by third parties like SGS or Intertek. Focus on testing the Na2S content and Iron (Fe) levels. Since Sodium Sulphide is hygroscopic and oxidizes easily, check the integrity of the vacuum-sealed packaging to ensure the product hasn't turned into sodium thiosulfate or carbonate during storage.

Sodium Sulphide is classified as a Class 8 Corrosive Substance (and sometimes Class 4.2 Spontaneously Combustible). It requires UN-approved packaging, typically 25kg PP woven bags with PE liners or 900kg/1000kg jumbo bags. Improper sealing can lead to the release of toxic Hydrogen Sulfide (H2S) gas, so ensuring airtight packaging and proper container ventilation is a mandatory safety precaution.

Utilize the Secured Trading Service on Made-in-China.com to protect your payments. Negotiate for staged payments (e.g., 30% deposit, 70% against BL copy). Always verify if the supplier has a Hazardous Chemicals Business License and a proven track record of exporting to your specific region to avoid customs clearance delays.

Due to its hazardous nature, Full Container Load (FCL) is highly recommended over LCL to avoid cross-contamination with other goods. Compare FOB and CIF terms; while CIF shifts insurance responsibility to the seller, FOB allows you to use specialized chemical forwarders who may offer better rates for hazardous Class 8 cargo handling.

Be aware of Anti-dumping duties that some countries impose on chemical imports. Always confirm the HS Code (typically 28301010) with your local customs broker to determine the exact import tariffs and VAT rates. Ensure the supplier provides a Certificate of Origin (CO) to benefit from any applicable Free Trade Agreements (FTAs).