ASTM D763-06(R2019) pdf free download

ASTM D763-06(R2019) pdf free download.Standard Specification for Raw and Burnt Umber Pigment
1. Scope
1.1 This specification covers the pigments commercially known as raw umber and burnt umber. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Composition and Properties
3.1 Dry Pigments—The pigments shall conform to the following requirements: 3.1.1 Raw Umber—The pigment shall be in a soft, dry form and shall be a hydrated oxide of iron (together with such manganese that is naturally associated with it) permeating a siliceous base and shall be free of admixtures of other substances except carbon pigments. The pigment shall conform to the requirements for composition prescribed in Table 1. 3.1.2 Burnt Umber—The pigment shall be produced by the calcination of raw umber and shall be free of admixtures of other substances except carbon pigments. The pigment shall conform to the requirements for composition prescribed in Table 1. 3.2 Paste in Oil—For both raw and burnt umber, the paste in oil shall be made by thoroughly grinding the pigment with linseed oil (with or without a small amount of volatile thinner) together with (where necessary) small amounts of wetting or dispersing agents to produce a paste or semipaste of satisfac- tory consistency. As received, it shall not be caked in the container and shall break up readily in linseed oil to form a smooth paint of brushing consistency. It shall mix readily in all proportions, without curdling, with linseed oil, turpentine, or volatile petroleum spirits, or any mixture of these substances. The paste shall conform to the following requirements:3.3 The mass color and character of the tint and the tinting strength formed by a mixture with a white pigment shall be within mutually agreed upon limits of a standard acceptable to both the purchaser and the seller.
4. Sampling
4.1 Two samples shall be taken at random from different packages from each lot, batch, day’s pack, or other unit of production in a shipment. When no markings distinguishing between units of production appear, samples shall be taken from different packages in the ratio of two samples for each 4540 kg or 10 000 lb, except that for shipments of less than 10 000 lb, two samples shall be taken. At the option of the purchaser, the samples may be tested separately or after blending in equal quantities the samples from the same production unit to form a composite sample.
5. Test Methods
5.1 Tests shall be conducted in accordance with the follow- ingASTM test methods. Test procedures not covered byASTM test methods shall be mutually agreed upon by the purchaser and the seller.