Sulfur black price manufacturers

Sulfur Black is typically graded by its dyeing strength (percentage), with 200% concentration being the industry standard for high-quality applications. Buyers should verify the solubility of the dye, as poor solubility leads to uneven coloring and 'bronzing' effects. Request a COA (Certificate of Analysis) to check the moisture content (typically <5%) and insoluble matter (typically <1%) to ensure consistent performance in textile processing.

There are two primary forms: Sulfur Black BR (Bluish-Reddish) and Liquid Sulfur Black. BR is the most common powder form used for denim and heavy cotton fabrics, while Liquid Sulfur Black offers better eco-friendliness, easier dosing, and reduced dust pollution. Ensure the product has high color fastness to washing (Grade 4-5) and light fastness to meet international apparel standards.

Due to environmental regulations, it is critical to ensure the product is REACH compliant for the EU market and meets ZDHC (Zero Discharge of Hazardous Chemicals) requirements. Verify that the supplier provides an SDS (Safety Data Sheet) and that the dye is free from restricted arylamines and heavy metals, ensuring it aligns with OEKO-TEX Standard 100 for textile safety.

The price is heavily influenced by the cost of raw materials (Dinitrochlorobenzene) and environmental tax in the manufacturing region. Suppliers using advanced oxidation and waste-water treatment technologies may have slightly higher prices but offer better batch-to-batch stability and lower risk of supply chain disruption due to environmental inspections.

Sulfur Black is classified as a spontaneously combustible solid (Class 4.2) or a hazardous chemical depending on the formulation. It must be stored in a cool, dry, and well-ventilated warehouse away from oxidizers and acids. Ensure the supplier uses UN-approved packaging (multi-layer moisture-proof bags or iron drums) to prevent moisture absorption, which can cause the dye to clump or degrade.

Always use secure payment methods and consider third-party inspections (such as SGS or Intertek) before the balance payment is made. For reliable sourcing, platforms like Made-in-China.com provide verified supplier profiles and Secured Trading Services to protect your funds until the goods are confirmed to meet your specifications.

Negotiate based on volume-based pricing tiers; purchasing in full container loads (FCL) can significantly reduce the per-unit shipping cost and lead to a 5-10% discount on the product price. Additionally, monitor the crude oil and sulfur market trends, as these fluctuations directly impact the production cost of synthetic dyes.

Ensure the HS Code (typically 320419) is correctly declared on all documents including the Commercial Invoice, Packing List, and Bill of Lading. Provide a clear Chemical Declaration and ensure the GHS labels on the packaging are in the language of the destination country to avoid delays or fines during customs inspection.