1、Designation: D 763 06Standard Specification forRaw and Burnt Umber Pigments1This standard is issued under the fixed designation D 763; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parenthes
2、es indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers the pigments commerciallyknown as raw umber and burnt umber.1.2 The values stated in SI units are to be regarded as thestandard
3、. The values given in parentheses are for informationonly.2. Referenced Documents2.1 ASTM Standards:2D50 Test Methods for Chemical Analysis of Yellow, Or-ange, Red, and Brown Pigments Containing Iron andManganeseD 185 Test Methods for Coarse Particles in Pigments,Pastes, and PaintsD 280 Test Methods
4、 for Hygroscopic Moisture (and OtherMatter Volatile Under the Test Conditions) in PigmentsD 387 Test Method for Color and Strength of ChromaticPigments with a Mechanical MullerD 1208 Test Methods for Common Properties of CertainPigments3. Composition and Properties3.1 Dry PigmentsThe pigments shall
5、conform to thefollowing requirements:3.1.1 Raw UmberThe pigment shall be in a soft, dry formand shall be a hydrated oxide of iron (together with suchmanganese that is naturally associated with it) permeating asiliceous base and shall be free of admixtures of othersubstances except carbon pigments. T
6、he pigment shall conformto the requirements for composition prescribed in Table 1.3.1.2 Burnt UmberThe pigment shall be produced by thecalcination of raw umber and shall be free of admixtures ofother substances except carbon pigments. The pigment shallconform to the requirements for composition pres
7、cribed inTable 1.3.2 Paste in OilFor both raw and burnt umber, the pastein oil shall be made by thoroughly grinding the pigment withlinseed oil (with or without a small amount of volatile thinner)together with (where necessary) small amounts of wetting ordispersing agents to produce a paste or semip
8、aste of satisfac-tory consistency. As received, it shall not be caked in thecontainer and shall break up readily in linseed oil to form asmooth paint of brushing consistency. It shall mix readily in allproportions, without curdling, with linseed oil, turpentine, orvolatile petroleum spirits, or any
9、mixture of these substances.The paste shall conform to the following requirements:Pigment, min, % 55Nonvolatile vehicle, min, % 80Moisture by distillation, max, % 2.0Coarse particles and skins (total residue retained on aNo. 325 (45-m sieve), max, % of dry pigment1.03.3 The mass color and character
10、of the tint and the tintingstrength formed by a mixture with a white pigment shall bewithin mutually agreed upon limits of a standard acceptable toboth the purchaser and the seller.4. Sampling4.1 Two samples shall be taken at random from differentpackages from each lot, batch, days pack, or other un
11、it ofproduction in a shipment. When no markings distinguishingbetween units of production appear, samples shall be takenfrom different packages in the ratio of two samples for each4540 kg or 10 000 lb, except that for shipments of less than10 000 lb, two samples shall be taken. At the option of thep
12、urchaser, the samples may be tested separately or afterblending in equal quantities the samples from the sameproduction unit to form a composite sample.1This specification is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct resp
13、onsibility ofSubcommittee D01.31 on Pigment Specifications.Current edition approved Nov. 1, 2006. Published November 2006. Originallyapproved in 1944. Last previous edition approved in 2001 as D 763 01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Serv
14、ice at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.TABLE 1 Requirements for Composition of Raw andBurnt Umber PigmentsRawUmberBurntUmberIron oxide (Fe2O3), min, % 37 42Calcium compounds (as CaO), max, % 5.0 5.0
15、Moisture and other volatile matter, max, % 5.0 5.0Coarse particles (total residue retained on a No. 325(45-m) sieve), max, %2.0 2.0Organic colors, max, % none none1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5. Test Methods5.1 Tes
16、ts shall be conducted in accordance with the follow-ingASTM test methods. Test procedures not covered byASTMtest methods shall be mutually agreed upon by the purchaserand the seller.5.2 Chemical Analysis of Dry PigmentTest MethodsD50.5.3 Moisture in Paste in OilTest Methods D 280, exceptthat the sam
17、ple shall be weighed instead of measured and theresults shall be expressed as weight percentage instead ofvolume.5.4 Coarse ParticlesTest Methods D 185.5.5 Pigment and Linseed Oil in Paste in OilTest MethodsD 1208.5.6 Mass Color and Tinting StrengthTest Method D 387.6. Keywords6.1 hydrated; pigment;
18、 raw and burnt umberASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement
19、 of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or fo
20、r additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known
21、 to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D763062
