1、Designation: D1648 86 (Reapproved 2014)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
2、. 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 a
3、re to be regarded as thestandard. The values given in parentheses are for informationonly.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 Analysi
4、s 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for Particle Size Analysis of Particulate Sub-stances in the Range of 0.2 to 75 Micrometres by OpticalMicroscopy (Withdrawn 1994)33.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 and
5、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 upontole
6、rances, 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
7、diameter (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
8、be 2.0 m.3.4.3 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 n
9、o markings distinguishingbetween 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
10、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 mutually agreed upon by the purc
11、haserand the seller.5.2 Chemical 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 s
12、ize by microscopic methods are de-scribed in Practice E20.5.5 Specific Surface DiameterPractice D1366.1This 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 Specif
13、ications.Current edition approved Dec. 1, 2014. Published December 2014. Originallyapproved in 1959. Last previous edition approved in 2008 as D1648 86 (2008).DOI: 10.1520/D1648-86R14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm
14、.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.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428
15、-2959. United States16. 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 in connection with any item mentionedin this standard. Us
16、ers 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 any time by the responsible technical committee and must be reviewed ever
17、y 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 comments will receive careful consideration at a meeting of theresponsible techni
18、cal 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 by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocke
19、n, 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). Permission rights to photoco
20、py the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 1 Requirements for PigmentsWeight %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, %D1648 86 (2014)2
