What Does Mercerised Cotton Mean

Complete Explanation

Mercerised cotton is a type of cotton fabric that has been treated with a sodium hydroxide solution under tension, a process known as mercerisation. The treatment alters the fibre’s structure, giving the fabric a smoother surface, increased luster, improved strength, and better affinity for dyes.

• Definition:
  Mercerisation is a chemical finishing process that modifies cotton fibres by swelling them with caustic soda, resulting in a silk‑like sheen.
• Process:
  The yarn or fabric is immersed in a 20‑30 % sodium hydroxide bath, stretched to 2–3 times its original length, then neutralised with acid and washed.
• Physical Effects:
  The treatment increases tensile strength by up to 20 %, reduces fabric shrinkage, and creates a tighter, more uniform fibre alignment.
• Visual Effects:
  Mercerised cotton exhibits a noticeable sheen and takes dye more evenly, producing vivid, long‑lasting colours.
• Historical Origin:
  Named after English chemist John Mercer, who patented the process in 1844.
• Common Uses:
  Often used for dress shirts, bed linens, active‑wear, and high‑quality apparel where a smooth hand and bright colour are desired.

Common Misconceptions