Qualitative chemical analyses of the mineral component of a paper specimen, Test Method A, serve to identify the ions of any such minerals. The results may then be interpreted in terms of the minerals themselves. Direct identification of some of these minerals or their ions is frequently possible using optical microscopical examination, Test Method B. For additional information, see the annex.

The analysis can be considerably simplified if it is desired only to establish the presence or absence of a particular filler.

A microscopical examination of the ash usually proves to be a useful adjunct to chemical analysis, and if possible should be attempted (see Sections 12 to 18).

1.1 These test methods cover two procedures for the qualitative determination and identification of the mineral constituents of filled and coated papers.

1.2 Due to the similarity in chemical composition and physical size and shape of some of the various possible constituents contained in a given paper specimen, more precise, quantitative methods may at times be required for positive identification.

1.3 It is recommended that one become thoroughly familiar with these test methods by analyzing paper samples of known mineral component content.

1.4 The test methods appear as follows:

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Note 1—These test methods are technically equivalent to TAPPI T 421 - 83.