Schiefer Test

Schiefer Cut Test

This test provided a measure of the cut (material removed from a work piece) and finish (the relative quality of the abraded surface) of coated abrasive articles under wet conditions. A 4-inch diameter circular specimen was cut from the abrasive material to be tested and secured by a pressure-sensitive adhesive to a back-up pad that has been pre-conditioned by soaking in water. The abrasive material was then pre-wetted by floating in water. The back-up pad was secured to the driven plate of a Schiefer Abrasion Tester (available from Frazier Precision Company, Gaithersburg, Md.) which has been plumbed for wet testing. A circular acrylic plastic work piece, 10.16 cm diameter by 1.27 cm thick, available as, "POLYCAST" acrylic plastic from Seelye Plastics, Bloomington, Minn. was employed. The initial weight of each work piece was recorded to the nearest milligram prior to mounting on the work piece holder of the abrasion tester. The water drip rate was set to 60±6 drops per minute. A 4.55 kg load was placed on the abrasion tester weight platform and the mounted abrasive specimen was lowered onto the work piece. The machine was set to run for 500 cycles and then automatically stop. After each 500 cycles of the test, the work piece was wiped free of water and debris and weighed. The cumulative cut for each 500-cycle test was the difference between the initial weight and the weight following each test.

If the finish of the work piece was to be determined, the abraded work piece was mounted in the specimen holder of a RANK SURTRONIC 3 Profilometer, available from Rank Taylor-Hobson, Leicester, England, and the surface profile is measured. R tm , which was the mean of the maximum peak-to-valley values from each of 5 sampling lengths, was reported for each test.


Test method 3M/ST:

Schiefer test on acrylic plate material after 5000 revolutions with a new pad.