Bleaching powder

The most critical factor is the Available Chlorine content, typically ranging from 30% to 70%. For industrial water treatment or textile bleaching, a higher concentration (65-70% Calcium Hypochlorite) is preferred for efficiency. You must also verify the moisture content (usually <3%) to ensure stability and the particle size (granularity) to match your specific application, whether it be water treatment tablets or fine powder for surface disinfection.

As a chemical product, it must have a valid MSDS (Material Safety Data Sheet). For water treatment, look for NSF/ANSI 60 certification. If exporting to the EU, REACH compliance is essential. Additionally, ensure the manufacturer holds ISO 9001 for quality management and ISO 14001 for environmental standards, as chemical production is strictly regulated.

Bleaching powder is inherently unstable and decomposes over time. You should request stability test reports from the supplier. High-quality products should have an annual chlorine loss rate of less than 5-10% when stored correctly. Ensure the packaging is UV-resistant and moisture-proof, typically using double-layer PE bags inside plastic drums (25kg/45kg/50kg) to prevent degradation during transit.

Common scenarios include municipal water disinfection, swimming pool sanitation, textile bleaching, and aquaculture. Because it is a strong oxidant, it must be stored away from acids, organic materials, and flammable substances. Buyers must ensure their facility meets local hazardous material storage regulations and provide personnel with appropriate PPE (Personal Protective Equipment).

Bleaching powder (Calcium Hypochlorite) is classified as Class 5.1 Dangerous Goods (Oxidizing Substances) under the IMDG Code (UN Number 1748/2880). The primary risk is spontaneous combustion if exposed to heat or moisture. You must work with freight forwarders experienced in DG (Dangerous Goods) handling and ensure the shipping container is stored 'away from heat' and 'on deck' if required by the carrier.

Prioritize Audited Suppliers who have undergone on-site inspections by third-party agencies like SGS or Intertek. Check their Business License to ensure 'Chemical Production' or 'Hazardous Chemical Trade' is within their scope. Request a pre-shipment inspection (PSI) to verify that the chlorine content of the actual batch matches the sample provided.

Focus on Total Landed Cost rather than just the FOB price, as DG shipping surcharges can be high. Negotiate for tiered pricing based on annual volume rather than a single spot order. Ask the supplier if they can provide customized packaging/labeling (GHS compliant) included in the price to avoid relabeling costs in the destination country.

Beyond the standard Invoice and Packing List, you will need a Dangerous Goods Declaration, a Certificate of Analysis (COA) for the specific batch, and the MSDS in the language of the destination country. Ensure the GHS labels on the drums are clearly visible and compliant with the importing country's regulations to avoid costly customs delays or seizures.