Greige Fabric Certification Scope and Restricted Chemical Testing Protocols
Greige fabric certification demands batch testing of sizing agents, spin finishes, and biocide residues before finishing treatments mask regulated chemicals.
Antimony Catalysts
Reaction Agent
Chemical initiators drive the polycondensation process required to manufacture most commercial polyester fibers. Common antimony catalysts accelerate the reaction between purified terephthalic acid and monoethylene glycol at high temperatures. This metallic compound usually remains as a residual element within the polymer matrix after cooling.
Residual Measurement
Quantitative analysis determines the concentration of the metal in the final textile. While antimony catalysts are effective for industrial scale production, international safety standards often restrict their migration levels into human perspiration. Testing involves digestion of the fiber and subsequent plasma analysis.
Environmental Impact
Disposal of wastewater from mills using these chemicals requires specific filtration steps to prevent heavy metal contamination. Because antimony catalysts do not evaporate, they persist in the sludge produced by treatment plants. Proper handling ensures that the metallic load does not enter local water systems.
Mill operators must verify that the concentration of the metal in discharge water meets local ecological requirements to avoid fines or permit revocation. Heavy metals like these accumulate in the environment over time.
Safety Boundary
Regulations set limits for the presence of the element in apparel. The use of antimony catalysts is generally permitted provided the extracted amount stays below established thresholds.