Crockmeter0 pages

Crockmeter 418
Rub and Color Transfer Testing
Measure the amount of color transfer from rubbing.
The Crockmeter is a relatively simple rub tester commonly
used to determine the amount of color transferred from
textile materials to other surfaces by rubbing. This
instrument has also been utilized to conduct smudge or
smear resistance tests on images produced by a printer or
copier. For paints and coatings, the crockmeter is useful
when evaluating the change in gloss due to rubbing,
scuffing or marring.
Easy to use, rugged design provides repeatable test
results.
A test sample is clamped to the instrument base and a
square of standard crocking cloth is fixed to a 16mm
diameter, acrylic rubbing finger. The finger rests on the
sample with a pressure of 900 grams force and traverses a
straight path approximately 100mm long with each stroke of
the arm.
Established rating scales standardize evaluation and
facilitate repeatable results.
After testing textile materials, the crocking cloth is removed
and compared against the AATCC Gray Scale for Staining or
Chromatic Transference Scale. Based on this comparison,
the operator assigns a grade to the color change or amount
of color transfer.