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.jpg "Crock Meter (Motorized) For Testing Lab")
CAT NO: DIDACTICNLE-Export-310004
Crock Meter (Motorized).
Crock Meter (Motorized) -
One of the tests for determination of color fastness of dyed leather
is the crocking test. This test is used for the determination of
colorfastness against rubbing, either under dry or under wet conditions.
In
this test a moving brass finger of specified shape and size rubs
against the test specimens under a fixed load. The amount of color
transferred to a piece of abradant fabric fixed over the base of the
moving finger is graded either against the amount of color transferred
by a standard leather sample under identical conditions, or by visual
rating of amount of color transferred during dry and wet rubbing.
The Crockmeter (motorized model) consists
of a rigid flat metallic platform on which the test specimen can be
held firmly and an abrading finger that rubs against it under a
specified load. The platform is fixed over the base of the equipment and
lies in a horizontal plane. The test specimen is held firmly over an
abrasive paper, which is pasted on the upper face of the platform, with
the help of two pressing pins holding it at both ends.
The
abrading finger has a flat circular rubbing face, which is covered with
a piece of white rubbing fabric during the test. The rubbing fabric
picks up color lost by the test specimen during rubbing. It is held over
the finger with the help of a spiral spring.
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