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.
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.