Retention Rating Scales
An aid for assessing texture change
CRI’s Performance Standards Committee has developed reference scales to be used as an aid in assessing appearance change in carpet. These scales are widely used in grading laboratory specimens, such as those tested in a Hexapod or Vettermann Drum tester, and also for grading floor traffic specimens tested according to ASTM D-6119. This series of reference scales is a revision of those previously adopted.
Each set of scales consists of six sets of digitally imaged increments of change, representing a five-point scale with intermediate half steps.
Below is a complete representative set of scales for CRI-1, Saxony cut-pile carpet:
Special abbreviated (Field Use) scales—supplied as a one-page full step version of each of the above—is displayed below.
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