13.2 Application of Compressive Force—Place the test
specimen between the plates of the compression device with
the spacers on each side, allowing sufficient clearance for the
bulging of the rubber when compressed (see Fig. 3). Where a
lubricant is applied, it shall consist of a thin coating of a
lubricant having substantially no action on the rubber. For most
purposes, a silicon or fluorosilicon fluid is suitable. Tighten the
bolts so that the plates are drawn together uniformly until they
are in contact with the spacers. The amount of compression
employed shall be approximately 25 %. A suitable mechanical
or hydraulic device may be used to facilitate assembling and
disassembling the test fixture.