The viewing cabinet shall be situated in a darkened room.
Place the tested specimen and a piece of the original sample, with or without pretreatment ,centrally on
the lectern in the viewing cabinet, with the length direction vertical. If necessary use a piece of self-adhesive PVC tape to ensure correct placement. Mount the tested specimen on the left and the original sample on the right.
In order to prevent glare from the light source view each specimen from just outside the viewing cabinet, directly in front of the specimen.
Due to the subjective nature of the assessment, it is recommended that more than one observer assess the specimens.
Grade each specimen in accordance with the grading scheme given in Table1. If the grading appears between two grades, report the“half”grading as,for example,3-4.
The test result for each individual observer is the average off our specimen grades. The test result for the laboratory sample is the average of the observer grades.
Photographic assessment maybe used to support the primary descriptive method of assessment, as agreed between interested parties.
A second assessment maybe made by rotating the specimen to a position where the observed pilling is more severe. This assessment maybe used to provide data for an“extreme”condition,e.g. where a surface is being viewed along the plane of the surface.
Report any other aspect which shows deterioration in surface appearance.
Table 1 - Visual assessment
Grade
|
Description
|
5
|
No change.
|
4
|
Slight surface fuzzing and/or partially formed pills.
|
3
|
Moderate surface fuzzing and/or moderate pilling. Pills of varying size and density partially covering the specimen surface
|
2
|
Distinct surface fuzzing and/or distinct pilling. Pills of varying size and density partially covering a large proportion of the specimen surface.
|
1
|
Dense surface fuzzing and/or severe pilling. Pills of varying size and density partially covering the whole of the specimen surface
|
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It is so useful that for your sharing. The summary is easy to understand, but I think it will be better if you add a ICI pilling box method .
回复删除Useful testing machine for piling test
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