1、Designation: D 1648 86 (Reapproved 2008)Standard Specification forBasic Lead Silicochromate Pigment1This standard is issued under the fixed designation D 1648; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisi
2、on. A number 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
3、 are to be regarded as thestandard. The values given in parentheses are for informationonly.2. Referenced Documents2.1 ASTM Standards:2D 1208 Test Methods for Common Properties of CertainPigmentsD 1366 Practice for Reporting Particle Size Characteristicsof PigmentsD 1844 Test Methods for Chemical An
4、alysis of Basic LeadSilicochromateE20 NO TITLE3. Composition and Properties3.1 Both types of pigment shall consist of silica coated withlead silicates and lead chromates and shall conform to therequirements in Table 1.3.2 The mass color and character of the tint obtained bymixing the pigment with a
5、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 upontolerances, to that of a reference sample agreed upon by thepurchaser and the seller.3.4 Particle Size:3.4.1 Type 1This grade is c
6、haracterized 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 diameter (SSD) shall be 8.5 m.3.4.2 Type 2This grade is characterized by major amountsof fine-sized particles. In general, the
7、 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 Where closer control within a grade is required, thefineness requirements shall be as agreed upon by the purcha
8、serand 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 distinguishingbetween units of a production appear, samples shall be takenfrom different packages, in the ratio of
9、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 in equal quantities the samples from the sameproduction unit to form a composite sample.5. Test Me
10、thods5.1 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 Chemical AnalysisTest Methods D 1844.5.3 Ignition LossDetermine the loss on ignition in accor-dance wi
11、th the section on Procedure of Test Methods D 1208,but using an ignition temperature of 450 to 550C.5.4 Particle Size by Microscopic MethodsProcedures fordetermining particle size by microscopic methods are de-scribed in Practice E20.5.5 Specific Surface DiameterPractice D 1366.1This specification i
12、s 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 July 1, 2008. Published July 2008. Originally approvedin 1959. Last previous edition appr
13、oved in 2003 as D 1648 86 (2003).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 Summary page onthe ASTM website.TABLE 1 Requirements for Pig
14、mentsWeight %Type 1Regular Particle SizeType 2Fine Particle SizeMin Max Min MaxLead oxide (PbO) 46.0 49.0 42.5 46.0Chromium trioxide (CrO3) 5.1 5.7 6.3 7.2Silica (SiO2) 45.5 48.5 47.5 50.5Moisture and other volatile mat- . 0.2 . 0.2ter, % . 0.2 . 0.2Ignition loss at 450 to550C, %1Copyright ASTM Inte
15、rnational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.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
16、 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 rights, are entirely their own responsibility.This standard is subject to revision at
17、 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 standardsand should be addressed to ASTM International Headquarters. Your comment
18、s 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 Committee on Standards, at the address shown below.This standard is copyrighted b
19、y 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 1648 86 (2008)2
