1、Designation:D164886(Reapproved 2020)Standard Specification forBasic Lead Silicochromate Pigment1This standard is issued under the fixed designation D1648;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 two types of pigment commer-cially known as basic lead silicochromate.1.2 The values stated in SI units are to be re
3、garded as thestandard.The values given in parentheses are for informationonly.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and
4、 Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1208 Test Methods for Common Properties of CertainPigmentsD1366 Practice for Reporting Particle Size Characteristics ofPigmentsD1844 Test Methods for Chemical
5、Analysis of Basic LeadSilicochromateE20 Practice for Particle Size Analysis of Particulate Sub-stances in the Range of 0.2 to 75 Micrometres by OpticalMicroscopy(Withdrawn 1994)33.Composition and Properties3.1 Both types of pigment shall consist of silica coated withlead silicates and lead chromates
6、 and shall conform to therequirements in Table 1.3.2 The mass color and character of the tint obtained bymixing the pigment with a white pigment shall be the same asthat of a reference sample mutually agreed upon by thepurchaser and the seller.3.3 The oil absorption shall be equal,within agreed upon
7、tolerances,to that of a reference sample agreed upon by thepurchaser and the seller.3.4 Particle Size:3.4.1 Type 1This grade is characterized by major amountsof particles in the 6.5-to 28-m range.Coarse particlesretained on a 45-m(No.325)sieve shall be less than 0.3%.The maximum specific surface dia
8、meter(SSD)shall be 8.5 m.3.4.2 Type 2This grade is characterized by major amountsof fine-sized particles.In general,the maximum size isessentially below 1.0 to 2.5 m.Coarse particles retained on a45-m(No.325)sieve shall be less than 0.1%.The maximumSpecific Surface Diameter(SSD)shall be 2.0 m.3.4.3
9、Where closer control within a grade is required,thefineness requirements shall be as agreed upon by the purchaserand 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 distinguis
10、hingbetween units of a production appear,samples shall be takenfrom different packages,in the ratio of two samples for each5000 kg(10 000 lb),except that for shipments of less than10 000 lb two samples shall be taken.At the option of thepurchaser,the samples may be tested separately or afterblending
11、 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 mutually agreed upon by the purchaserand the seller.5.2 Chemi
12、cal AnalysisTest Methods D1844.5.3 Ignition LossDetermine the loss on ignition in accor-dance with the section on Procedure of Test Methods D1208,but using an ignition temperature of 450 to 550C.5.4 Particle Size by Microscopic MethodsProcedures fordetermining particle size by microscopic methods ar
13、e de-scribed in Practice E20.1This 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 1,2020.Published June 2020.Originall
14、yapproved in 1959.Last previous edition approved in 2014 as D1648 86(2014).DOI:10.1520/D1648-86R20.2For 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
15、 Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationall
16、y recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.15.5 Specific Surface DiameterPractice D1366.6.Keywords6.1 basic lead silicochromate(BLSC);chrominium inBLSC;lead chromate;lead in BLSC;lead oxide;pigment;silica in BLSCASTM International takes no position respecting the validity of any patent rights asserted i
