What is polynosic modal

Polynosic fiber


A modified rayon fiber that has a high wet modulus and a low degree of swelling. Polynosic fibers are made by a process developed by S. Tachikawa in Japan in 1951. They are a type of modal rayon that has a high degree of polymerization (55%: compared to 40% for ordinary rayon and 70-80% for Cotton) . Polynosic fibers are dimensionally stable and do not shrink or get pulled out of shape when wet like many rays. They are also wear resistant and strong while maintaining a soft, silky feel. Polynosic fibers have found a wide variety of uses in clothing, outerwear, and household furnishings. They are often blended with cotton, wool, or synthetic fibers.

Definitions and Related Terms

polynosic fiber (Br.); HWM rayon; Toramoms; Tufcel

Physical and Chemical Properties

  • Unaffected by bleaches or dry cleaning solvents
  • Tenacity = 3 - 5 g / denier
  • Elongation = 6-14% (dry), 8-20% (wet)
  • Cross section = circular or bean shaped, may have striations.
  • Density = 1.52-1.54

Resources and Citations

  • Identification of Textile Materials, The Textile Institute, Manchester, England, 1985
  • J. Gordon Cook, Handbook of Textile Fibers: II Man-made Fibers, Merrow Publishing Co., Durham, England