James Heal supplies assessment masks for the following methods:

  • ISO / AATCC  (766-477)
  • M&S (766-478)


There are similarities between the 2 masks:

  • Size - 228mm long and 58mm wide
  • Viewing windows - 32mm x 28mm and 15mm x 50mm
  • Matt black on both sides


There are 2 physical differences between the masks:

  • ISO / AATCC is 0.8mm thick and is made from a single layer of flexible plastic
  • M & S is 1.9mm thick and is laminated


The main differences are how these masks should be used.


ISO / AATCC

The 32mm x 28mm mask is used for assessing crocking cloth staining, or when a larger area is needed.

The 15mm x 50mm mask is used for assessing both staining and change in colour.


M&S 

The 32mm x 28mm mask is for assessing change in colour.

The 15mm x 50mm mask is for assessing level of staining.

The size of the window allows for isolated from the surrounding fabric.


A PDF version of this FAQ is available for reference.