1、Designation:D428802(Reapproved 2012)Standard Specification forCalcium Borosilicate Pigments1This standard is issued under the fixed designation D4288;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number
2、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 three grades of pigment com-mercially known as calcium borosilicate composite pigment.The two types differ in chemical c
3、omposition while the twoclasses of Type I differ in oil absorption.2.Referenced Documents2.1 ASTM Standards:2C958 Test Method for Particle Size Distribution of Aluminaor Quartz by X-Ray Monitoring of Gravity SedimentationD185 Test Methods for Coarse Particles in PigmentsD281 Test Method for Oil Abso
4、rption of Pigments bySpatula Rub-outD1366 Practice for Reporting Particle Size Characteristics ofPigmentsD3360 Test Method for Particle Size Distribution by Hy-drometer of the Common White Extender Pigments(Withdrawn 2003)3D4487 Test Methods for Analysis of Calcium Borosilicate3.Composition and Prop
5、erties3.1 All types of pigment shall consist of a complex com-posite of alkaline earth silicates and borates and shall conformto the requirements of Table 1.3.2 The mass color of the dry pigment is white.The shadeand tinting strength when specified shall be equal to that of areference sample mutuall
6、y agreed upon between the purchaserand the seller.3.3 Particle Size:3.3.1 All types are characterized by major amounts ofparticles in the 1 to 10-m range.Coarse particles retained ona 45-m(No.325)sieve shall be less than 0.3%.Themaximum specific surface diameter(SSD)shall be 2.5-m.3.3.2 Where closer
7、 control within a class or type is required,the fineness requirements shall be as agreed upon between thepurchaser and the seller.4.Sampling4.1 Two samples shall be taken at random from differentpackages from each lot,batch,days pack,or other unit ofproduction in a shipment.When no markings distingu
8、ishingbetween units of production appear,samples shall be takenfrom different packages,in the ratio of two samples for each 10000 lb(5000 kg),except that for shipments of less than 10 000lb two samples shall be taken.At the option of the purchaser,the samples may be tested separately or after blendi
9、ng in equalquantities the samples from the same production unit to form acomposite 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 mutually agreed upon between thepurchaser and the seller.5.2
10、 Chemical AnalysisTest Methods D4487.5.3 Ignition LossTest Methods D4487.5.4 Particle SizeTo be determined by Test Method D3360or equivalent instrumental technique.45.5 Specific Surface DiameterParticle Size by Sedimenta-tion Methods section of Practice D1366.5.6 Oil AbsorptionTest Method D281.5.7 C
11、oarse ParticlesThe Insoluble Dry Pigments sectionof Test Methods D185.6.Keywords6.1 alkaline earth silicates;borates;calcium borosilicate;pigment;silicates1This specification is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct res
12、ponsibility ofSubcommittee D01.31 on Pigment Specifications.Current edition approved Nov.1,2012.Published November 2012.Originallyapproved in 1983.Last previous edition approved in 2007 as D4288 02(2007).DOI:10.1520/D4288-02R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcon
13、tact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4The Micromeritics Sedigraph 5000D Particle Size Analy
14、zer,manufactured byMicromeritics Instrument Corp.,568 Goshen Springs Rd.,Norcross,GA30093,hasbeen found satisfactory for this purpose.See Test Method C958 for operatinginstructions.Other instruments having a similar slurry density measurementfunction may also be used.Copyright ASTM International,100
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