รายละเอียดเอกสาร

This test method covers the determination of the apparent cell size of rigid cellular plastics by counting the number of cell-wall intersections in a specified distance. Procedure A requires the preparation of a thin slice, not more than one half the average cell diameter in thickness, that is mechanically stable. For most rigid cellular plastics this limits the test method to materials with an average cell size of at least 0.2 mm. Procedure B is intended for use with materials whose friable nature makes it difficult to obtain a thin slice for viewing. The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.

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