Determination of Colour Fastness to Rubbing - Textile Material

Colour-Fastness-of-Textile-to-Rubbing-Gray-Scale-Crock-Meter
 

Colour Fastness of Textile to Rubbing

APPARATUS 

  • Crock Meter
  • Grey scale

 


TOOLS/ACCESSORIES                       

a) Rubbing finger

  • Diameter-3.2 cm
  • Flat area-2.5 cm
  • Circular transition radius -0.32 cm

 b) Rubbing cotton cloth

  • Cut in squares- 5X5cm

Colour Fastness of Textile to Rubbing


NO. OF TEST PIECES                       

 4 (Each not less than 14X 5 cm)

  • Cut the sample in warp ways -2(1 for dry & 1 for wet rubbing) and
  • Cut the sample in Weft ways-2 (1 for dry & 1 for wet rubbing)


PEOCEDURE 

  • Fix the sample in rubbing device by using clamps.
  •  Rubbing it to and fro in straight line along a track 10 cm long on the dry specimen 10 times to and fro in 10 seconds with downward force 22N ( for pile fabrics, including floor covering ) or 9N (for all other textiles).  
  •  For wet rubbing, wet the rubbing cloth with water (if cloth is 1 g means, wet up to 2g )
  •  After rubbing ,dry the cloth at room temperature
  •  Assess the staining of rubbing cotton clothes with Grey scale.


REFFERENCE SPECIFICATION     : IS 766-1988

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