The following method is employed for abrasion resistance testing.

(3) Reciprocating motion abrasion resistance testing

This is an abrasion resistance testing method by using a device as shown in [Fig.3] where rubbing by reciprocating motion is applied between the contact loaded test specimen and abrasive paper pasted wheel.

●Abrasive paper Abrasive paper CC as defined in JIS R6252 or WA #240~#600 is to be used. ●Test specimen 80mm×80mm flat plate as standard. ●Determine by the following formula based on changes in mass or plating thickness. WR=N/（w1-w2）or WR=N/（t1-t2） 　Where 　WR: Abrasion resistance (DS/mg) or (DS/ μm) 　w1: Weight of test specimen before the test (mg) 　w2: Weight of test specimen after the test (mg) 　t1: Thickness of test specimen before the test (μm) 　t2: Thickness of test specimen after the test (μm) 　N: Number of reciprocation (DS value)

(4) Twin disc drive abrasion tester (Amsler type abrasion testing)

This is a test method to examine abrasion resistance of platings by applying loads on the test specimen and rubbing wheels with 10% slip ratio in either dry or wet conditions, and applying rolling or sliding friction using a device shown in [Fig.5]

●Test specimen

O.D. 40mm, I.D. 16mm, Thickness 10mm

●Abrasion wheel

The material is selected based on product usage environment.

●Determine based on mass or thickness changes.

Calculated with the following formula.