Mercerization Chemicals

Mercerization is a controlled caustic-soda treatment that swells cotton fiber under tension to raise luster, tensile strength, and dye uptake. The working chemistry is concentrated sodium hydroxide (caustic soda) applied at high strength, followed by thorough acid neutralization. Caustic soda does the structural work; acetic acid resets fabric pH before the goods move to dyeing.

Caustic soda is the only active that swells cotton enough to lock in mercerized luster. Mills typically run cold mercerization at roughly 25-30 u00b0Bu00e9 caustic for full fiber swelling. The trade-off is real: higher caustic concentration lifts luster and dye affinity but increases shrinkage-control demands, fabric-handling difficulty, and the downstream neutralization load. Specify caustic strength to the fabric construction, not to a single house standard.

After caustic treatment, residual alkali must come off the cloth before dyeing or shade reproducibility suffers. Acetic acid neutralizes faster and more controllably than a water-only wash, and it leaves the goods at a dye-ready pH. Target a final fabric pH near neutral (about 6.5-7.5) and confirm with a test strip before the dye bath. A dedicated alkali-stable wetting agent is dosed separately to speed caustic penetration.

• Cold caustic mercerization of woven and knit cotton for luster and improved dye uptake
• Tension mercerization of yarn and fabric to raise tensile strength and dimensional stability
• Pre-dye caustic treatment to deepen reactive and direct shade yield
• Post-caustic acid neutralization to return goods to a dye-ready pH
• Caustic make-down and replenishment on continuous mercerizing ranges

• Sodium hydroxide (caustic soda) — PubChem
• Acetic acid — PubChem