SATRA TECHNOLOGY CENTRE TESTMETHOD:SATRATM167 (formerlyPM167) COLOUR FASTNESS TO RUBBING- CROCKMETERTEST APRIL2001 Thismethod isintended todeterminethedegreeoftransferof surface colourfroma material duringmilddry or wet rubbing. The method is mainlyapplicable to fabrics,leathers,yarns and sewingthreadsbutcanbeusedtoassessany coloured sheet material. SATRA TM167:2001 / Page 1 1.SCOPE This method is intended to determine the degree of transfer of surface colour from a material during mild dry or wet rubbing. The method is mainly applicable to fabrics, material. 2.PRINCIPLE moved linearlyforwardsand backwardsundera constant contactforce.Aftera set number 3.REFERENCES IsO 05 A03: 1993 -Grey scale for assessing staining. BS 950:Part 1:1967 (1980)- Iluminant for Colour Matching and Colour Appraisal. 4.APPARATUS 4.1 A crockmeter type rubbing machine, see cover photograph, with: 4.1.1Aflat horizontalbaseof minimumlength130mmand minimumwidth30mm with a means of holding the test specimen. 4.1.2 A cylindrical rubbing finger with: Adiameter of 16±1mm. - Square edges between the lower end face and the side of the cylinder A means of clamping the cotton lawn (4.2) over the lower end face. 4.1.3 Amethod of applying a force of 9.0 ± 0.2 N to the rubbing finger (4.1.2) 4.1.4 A means of moving the rubbing finger (4.1.2) through a distance of 105 ± 5 mm up and down the longitudinal centre line of the base (4.1.1) at a rate of approximately once persecond. 4.1.5 The face of the rubbing finger orientated so that it lies flat on the test specimen throughout the test. However, as test specimens of varying thicknesses are tested it is specimens of thickness between 2.0 and3.0 mm use a metal shim of nominal thickness 2 mm. The apparatus is not suitable for testing materials of thickness greater than 3.0 mm. A suitable machine is available from SATRA reference STD 422. 4.2 Squarepieces of cotton lawn, see section 8.1, 50±2 mmx 50 ±2mm desized, bleached,withoutfinish: For testing multicoloured or double sided textiles -Four pieces of cotton lawn. For testing single coloured materials-Two pieces of cotton lawn. SATRATM167:2001/Page2 Suitabiecottonlawn is availablefromSATRA referenceSTD422CL. 4.3 A grcy scale with half step ratings for assessiny the degree of staining as described in ISO 105-A03:1993.A suitable grey scale is available from SATRA reference STD 461 GS. A suitable cabinet can be obtained from SATRA. 4.5 Distilled or deionised water. 5.TESTSPECIMENS 5.1 in the case of sheet material, cut out two rectangular test specimens of minimum width 50 mm and minimum length 140 mm. For synthetic materials the longer edges of the test specimens should be parallel to the along or warp direction of the material 5.2 if the material to be tested is a double sided fabric such as a print or plush fabric it may be necessary to test both sides of the fabric. In such cases cut four test specimens as specified in section 5.1. 5.3 if the material to be tested is yarn or thread, form a layer of parallel strands by and minimum length 140 mm. 5.4 When testing multicoloured textiles cut two additional test specimens at 90 degrees to those cut in section 5.1 so that their longer edges are parallel to the across direction. Ensure that rubbing occurs across all colours of the design. if the areas of colour are 6.PROCEDURE 6.1 Place a piece of cotton lawn (4.2) over the rubbing finger (4.1.2) and clamp it in position so that one of the weave directions of the cotton lawn is parallel to the length of the base (4.1.1). 6.2 Fasten a test specimen to the base (4.1.1) so that the surface to be tested is uppermost. 6.3 Lower the rubbing finger (4.1.2) onto the test specimen. 6.4 Operate the crockmeter rubbing machine (4.1) so that the rubbing finger rubs the test specimen 10 times to and fro in 10 ±1 seconds. 6.5 Remove the cotton lawn (4.2) from the rubbing finger (4.1.2) and the test specimen from the base (4.1.1). 6.6 Place a fresh piece of cotton lawn (4.2) in the distille