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8
Crocking with the scrub tester
It is possible to mount friction finger sets on the tool holder (4). In this combination,
crocking tests can be carried out with samples up to 15 mm thickness (with the
sample tray placed).
To test samples above 15 mm thickness it is recommended to purchase the
modification set „Crockmeter".
Up to 4 identical or different friction sets can be used at the same time, depending
on the friction material, the sample surface, the speed and the test load.
The maximum possible test load is depending on the friction material, the sample
surface and the speed.
8.1 Preparation
Before the apparatus is prepared for crocking tests, you should have decided:
•
according which standard the crocking test should be carried out
•
which friction finger set, friction material and/or friction medium if
necessary you will be using
•
on the number of double strokes
•
on the evaluation procedure
•
on the time between the friction stress and the evaluation of the friction
lane
8.2 Mounting the friction finger sets
To carry out crocking tests at least one friction finger set and one weight are
needed. Some standards or test procedures require additional equipment and
auxiliary material.
For available options for crockmeter tests please refer to chapter 3.5 "Options for
crockmeter tests" on page 12.
A guideline for selecting the suitable equipment according to the desired standards
can be found in the document „Equipment for Crockmeter tests" available at:
www.proceq.com
Page 37
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