ASTM D476-2000(2005) Standard Classification for Dry Pigmentary Titanium Dioxide Products《二氧化钛干颜料色素的标准分类》.pdf

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1、Designation: D 476 00 (Reapproved 2005)Standard Classification forDry Pigmentary Titanium Dioxide Products1This standard is issued under the fixed designation D 476; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last

2、revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This classification describes seven types

3、 of dry pigmen-tary titanium dioxide products, grouped by composition, typi-cal end use application, and some performance properties.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.2. Referenced Documents2.1 ASTM Standards:

4、2D34 Guide for Chemical Analysis of White PigmentsD 153 Test Methods for Specific Gravity of PigmentsD 185 Test Methods for Coarse Particles in Pigments,Pastes, and PaintsD 280 Test Methods for Hygroscopic Moisture (and OtherMatter Volatile Under the Test Conditions) in PigmentsD 1394 Test Methods f

5、or Chemical Analysis of WhiteTitanium PigmentsD 2448 Test Method for Water-Soluble Salts in Pigments byMeasuring the Specific Resistance of the Leachate of thePigmentD 3720 Test Method for Ratio of Anatase to Rutile inTitanium Dioxide Pigments by X-ray Diffraction3. Significance and Use3.1 This clas

6、sification is given as an aid in determining thefitness for use of a titanium dioxide pigment for a coatingapplication. It is limited to dry, hiding pigments. It excludespigment dispersions, and non-hiding specialty titanium dioxideproducts.4. Basis for Classification4.1 Titanium dioxide pigments ca

7、n differ in many ways,including composition and performance. This classificationoutlines differences between pigment types that should beconsidered when selecting a product for a coating application.A minimum number of properties are given to highlight majordifferences, while allowing maximum flexib

8、ility.5. Composition and Properties5.1 Titanium Dioxide Pigments, should conform to therequirements for composition prescribed in Table 1. They arechemically prepared pigments consisting of anatase or rutiletitanium dioxide with or without modifications with water-insoluble oxides of aluminum, silic

9、on, zinc, etc., or otheragents; these reagent materials are introduced specifically toimprove those properties for which the pigment is used. Thetitanium dioxide pigments shall be free of extenders such asbarium sulfate, clay, magnesium silicate, whiting, etc.5.2 The desired properties of the pigmen

10、t, other than asherein indicated, shall be subject to agreement between thepurchaser and the seller and shall be based on a satisfactorymatch between the submitted pigment sample and a previouslyagreed upon reference sample (see 6.1.6).6. Test Methods6.1 Tests shall be conducted in accordance with t

11、he follow-ing test methods. Test procedures not covered by ASTM testmethods shall be mutually agreed upon between the purchaserand the seller.6.1.1 Chemical AnalysisGuide D34 or Test MethodsD 1394.6.1.2 Specific GravityTest Methods D 153.6.1.3 Coarse ParticlesTest Methods D 185.6.1.4 MoistureTest Me

12、thods D 280.6.1.5 Matter Soluble in Water, Specific ResistanceTestMethod D 2448. The measured specific resistance of theaqueous leachage from the pigment is an index of the level ofwater-soluble salts.6.1.6 Chalking ResistanceIt is recommended that pur-chaser and seller agree upon standards and meth

13、ods of testsuitable for their requirements (see 5.2). Comparison in a goodquality exterior air-dry alkyd enamel (trade sales or industrial)and exposure in Florida at 45 facing south are recommended.Chalking differences are minimized by less durable vehicles,while required exposure times are prolonge

14、d by more durablevehicles. Once the reference sample agreed upon between the1This classification 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

15、approved Sept. 1, 2005. Published September 2005. Originallyapproved in 1938. Last previous edition approved in 2000 as D 476 00.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume informati

16、on, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.TABLE1ClassificationofDry,PigmentaryTitaniumDioxidePigmentsTypicalPropertiesClassificationTypeIIIIIIIVVVIVIIASTMStand

17、ardsCrystaltypeanataseArutilerutilerutilerutilerutilerutileD3720Chalkingresistance,relativefreechalkinglow-mediummediumhighhighmedium-highmedium-highTypicalenduseapplication(s)whiteexteriorhousepaintandinterioruseslow-medium%PVChigh%PVCexteriorcoatingsrequiringexcellentdurabilityexteriorcoatingsrequ

18、iringexcellentdurabilitywithhighglossint-extcoatingsmedium-high%PVCint-extcoatingslow-high%PVCTitaniumdioxide(TiO2)content,min.,%94928080909092D1394Specificresistance,min,V5000500030003000300050005000D2448Moisturecontentaspacked,min,%0.70.71.51.510.70.7D280Specificgravity3.84.04.04.33.64.33.64.33.64

19、.33.64.34.04.3D15345-mscreenresidue,max,%0.10.10.10.10.10.10.1D185AIdentificationofanataseorrutileormixturesthereofismadebyX-rayanalysis(TestMethodD3720).D 476 00 (2005)2purchaser and seller has qualified, subsequent shipments of thatproduct may be compared with the reference sample by anagreed upon

20、 accelerated weathering test.7. Keywords7.1 anatase; dioxide pigments; rutile; titanium; whitepigmentsASTM 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 de

21、termination of the validity of any such patent rights, and the riskof infringement 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

22、or withdrawn. Your comments are invited either for revision of this standard or for 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 t

23、hat your comments have not received a fair hearing you shouldmake your views known 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).D 476 00 (2005)3