ASTM D718-86(2020) pdf download

10-04-2020 comment

ASTM D718-86(2020) pdf free download.Standard Test Methods for Analysis of Aluminum Silicate Pigment.
5. Purity of Reagents
5.I Reagent grade chemicals shall be used in all tests.Unless otherwise indicated, it is intended that all reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society, where such specifications are available. Other grades may be used, pro- vided it is first ascertained that the reagent is of sufficiently high purity to permit its use without lessening the accuracy of the determination.
5.2 Unless otherwise indicated. references to water shall be understood to mean Type If of Specification D1193.
15. Procedure
15.1 Carefully weigh out the proportion of the standard extender pigment and standard zinc oxide mutually agreed upon, and rub up to a fairly stiff paste with a glass muller on a glass plate or stone slab with raw linseed oil conforming to Prepare a similar paste with the sample using the same weight of pigment, volume of oil, and number of strokes of the glass muller as used in the preparation of the paste of the standard pigments. Spread the pastes adjacently on a microscope slide, draw a scraper lightly across them to present them on an even plane, and judge the color immediately.
16. Precision and Bias
16.1 Data are not available to determine the precision and bias of these methods. There are no plans at present to obtain such information. The methods have been in use for several years and are considered acceptable.
17. Keywords:aluminum oxide in aluminum silicate pigment;aluminum silicate pigment, analysis of; pigment, aluminum silicate.

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