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Testing Thickness

Thickness

Apparatus

Micrometer - properly calibrated dead weight micrometer, fitted with a dial gauge reading correct to 0. 01 mm or, alternatively, a micrometer fitted with a dial gauge reading correct to 0. 0005 inch. A screw micrometer shall not be used on a yielding material like paper.

Sheet-Holder - The device consists of two parallel plane faces, which are parallel to within 0. 005 mm and constrained to move apart in the direction perpendicular to their planes. The smaller of the faces, which generally moves, is circular, with 14 to 16. 5 mm diameter, corresponding to an area of 160 to 210 mm2. The moving number is geased to the micrometer dial gauge indicator reading correct up to 0. 01 mm.

Precautions

Before starting, it is essential to see that there is no clearance between the two parallel faces and that when the moving face touches the other parallel plane face, the pointer on the dial is at zero reading. The pointer should be brought to zero position, if necessary.

Care shall be taken to see that the sheets are free from folds and creases.

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