Caustic soda and hydrogen peroxide actives with EDTA/DTPA chelants and sodium silicate, sodium metasilicate, and magnesium sulfate stabilizers for greige-goods preparation before dyeing.
Scouring and bleaching chemicals prepare greige (loom-state) fabric for dyeingnby removing natural waxes, oils, and seed-hull impurities, then whitening the fiber.nA combined scour-bleach bath runs on two actives: caustic soda (sodium hydroxide, CASn1310-73-2), the alkali that saponifies waxes, and hydrogen peroxide (CAS 7722-84-1), thenbleaching oxidant. Run both in one bath where line time is tight; split them when fiber-damagencontrol matters more than throughput.
nnAlkaline hydrogen peroxide decomposes too fast if trace iron, copper, or manganese arenpresent, and uncontrolled decomposition pits the fiber. Two tools manage this. Chelants u2014nEDTA (CAS 60-00-4) and the stronger DTPA (CAS 67-43-6) u2014 sequester the trace metals; silicatenstabilizers such as sodium metasilicate (CAS 6834-92-0) buffer the bath and slow peroxidenrelease. The trade-off is real: more peroxide whitens faster but raises the risk of tendering,nso stabilizer dose, not oxidant dose, is the control lever.
nnSoda ash (sodium carbonate, CAS 497-19-8) sets the milder alkalinity used to buffer scournand reactive-dye baths, where full-strength caustic would be too harsh. For mercerizing-gradenswelling you still need concentrated caustic soda; for routine scouring, build the bath fromnsoda ash plus a wetting agent and reserve caustic for wax-heavy goods. Sequence the chelantnahead of the peroxide so metals are tied up before the oxidant is charged.
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