1、Designation: D763 06 (Reapproved 2012)Standard Specification forRaw and Burnt Umber Pigments1This standard is issued under the fixed designation D763; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A num
2、ber in parentheses indicates the year of last reapproval. Asuperscript epsilon () 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
3、 as thestandard. The values given in parentheses are for informationonly.2. Referenced Documents2.1 ASTM Standards:2D50 Test Methods for ChemicalAnalysis of Yellow, Orange,Red, and Brown Pigments Containing Iron and Manga-neseD185 Test Methods for Coarse Particles in PigmentsD280 Test Methods for Hy
4、groscopic Moisture (and OtherMatter Volatile Under the Test Conditions) in PigmentsD387 Test Method for Color and Strength of ChromaticPigments with a Mechanical MullerD1208 Test Methods for Common Properties of CertainPigments3. Composition and Properties3.1 Dry PigmentsThe pigments shall conform t
5、o 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. The pigmen
6、t 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 prescribed in
7、Table 1.3.2 Paste in OilFor both raw and burnt umber, the paste inoil 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 semipaste of s
8、atisfac-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 mixture o
9、f 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 of the ti
10、nt 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 unit ofprod
11、uction 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 thepurchaser,
12、 the samples may be tested separately or afterblending in equal quantities the samples from the sameproduction unit to form a composite sample.5. Test Methods5.1 Tests shall be conducted in accordance with the follow-ingASTM test methods. Test procedures not covered byASTMtest methods shall be mutua
13、lly agreed upon by the purchaserand the seller.5.2 Chemical Analysis of Dry PigmentTest Methods D50.5.3 Moisture in Paste in OilTest Methods D280, exceptthat the sample shall be weighed instead of measured and theresults shall be expressed as weight percentage instead ofvolume.5.4 Coarse ParticlesTe
14、st Methods D185.1This specification is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.31 on Pigment Specifications.Current edition approved June 1, 2012. Published August 2012. Originallyappro
15、ved in 1944. Last previous edition approved in 2006 as D763 06. DOI:10.1520/D0763-06R12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summa
16、ry page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.5 Pigment and Linseed Oil in Paste in OilTest MethodsD1208.5.6 Mass Color and Tinting StrengthTest Method D387.6. Keywords6.1 hydrated; pigment; raw and burn
17、t 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 of such righ
18、ts, 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 for additional
19、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 to the ASTM
20、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 abovea
21、ddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE 1 Requirements for Composition of Raw andBurnt Umber PigmentsRawUmberBurntUmberIron oxide (Fe2O3), min, % 37 42Calcium compounds (as CaO), max, % 5.0 5.0Moisture 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 noneD763 06 (2012)2
