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.
Biocide Preservatives
Microbial Suppression
Chemical agents formulated to suppress biological growth represent standard protective inputs in liquid textile processing baths and wet-stored raw materials. Stored starch pastes and natural fibre emulsions rely on biocide preservatives to prevent microbial consumption of organic polymers before weaving or finishing. Bacterial colonies rapidly digest starch hydrocolloids, lowering bath viscosity and breaking down warp sizing performance.
Fungal spores attack damp cotton grey goods during transoceanic shipping, causing localized tender damage and uneven dye uptake downstream. Proper dosing maintains chemical stability across extended production holds.
Degradation Mechanism
Enzymatic cleavage of natural polymer chains occurs rapidly when bacterial populations multiply in aqueous sizing tanks. Unprotected starch sizing formulations suffer severe shear-thinning within forty-eight hours of preparation, dropping viscosity below the threshold required for film formation on warp yarns. Incorporating biocide preservatives breaks metabolic pathways in micro-organisms, halting enzyme production before polymer integrity degrades.
Secondary decay affects liquid softeners and thickeners, producing foul odours and volatile acid residues that yellow light-coloured fabrics during heat setting.
Analytical Verification
High-performance liquid chromatography measures active molecule concentration against regulatory compliance limits such as OEKO-TEX Standard 100 or REACH Annex XVII. Testing labs extract residual chemistry from finished cloth using organic solvents before running chromatographic separation. Excess residual biocides trigger export rejections due to skin sensitisation risks, while under-dosing leads to fabric mildew claims during warehousing.
Processing Boundary
Thermal exposure above eighty degrees Celsius rapidly degrades specific volatile active molecules during fabric drying cycles. Mills must compensate for heat loss by introducing post-wash finishing application points or choosing heat-stable chemical variants. Chemical compatibility with ionic dye bath auxiliaries limits late-stage bath additions.