How to Bleach Polyester/Cellulosic Blends

Bleaching of Polyester/Cellulosic blends is typically for the cotton portion of the blend.  The goods should be scoured prior to bleaching.

Any processing bath involving rayon should not exceed a pH of 9.0 as it may lead to saponification of the rayon.


  • Scour goods in a bath containing 2% owg Orconol CHSA Conc™ and 2% owg tetrasodium pyrophosphate(TSPP) and run at 205°F(96°C) for one hour.
  • For heavily soiled cotton, 5% owg of Caustic Soda may be used in place of TSPP, and Orconol CHSA Conc™ should be substituted with Orcoterge ALK-N Conc™ due to the high alkalinity of the bath.
  • Drop bath and rinse well.
  • In a fresh bath, bleach goods by adding:
    • 2.20 % owb                        Hydrogen Peroxide 35%
    • 0.7 %    owb                         Sodium Silicate
    • 0.06 % owb                        Sodium Hydroxide
    • 0.5-1.0% owg                    Orcoterge ALK-N Conc™
  • Run goods at 180°F(82°C) for 1 ½ hours.
  • Drop bath and rinse until clear.

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