ASTM_D_605_-_82_2012.pdf

Designation:D60582(Reapproved 2012)Standard Specification forMagnesium Silicate Pigment(Talc)1This standard is issued under the fixed designation D605;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.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 pigments that consist substan-tially of natural hydrous magnesium silicate,and is restricted tothose minerals that conform to the chemical limits prescribedherein and can be suitably processed to what is commerciallyknown as paint pigment quality.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 The following hazard caveat applies to the test methodportion of this specification only.This standard does notpurport to address all of the safety concerns,if any,associatedwith its use.It is the responsibility of the user of this standardto establish appropriate safety and health practices anddetermine the applicability of regulatory limitations prior touse.2.Referenced Documents2.1 ASTM Standards:2D280 Test Methods for Hygroscopic Moisture(and OtherMatter Volatile Under the Test Conditions)in PigmentsD281 Test Method for Oil Absorption of Pigments bySpatula Rub-outD562 Test Method for Consistency of Paints MeasuringKrebs Unit(KU)Viscosity Using a Stormer-Type Viscom-eterD717 Test Methods for Analysis of Magnesium SilicatePigmentD1208 Test Methods for Common Properties of CertainPigmentsD1210 Test Method for Fineness of Dispersion of Pigment-Vehicle Systems by Hegman-Type Gage3.Composition and Properties3.1 The pigment shall be made by grinding or otherwiseprocessing natural,hydrous magnesium silicate and shallconform to the following requirements:Weight%minmaxCombined magnesium and calcium sili-cates(MgO plus SiO2plus CaO)88.Calcium oxide(CaO).10Aluminum and iron oxides(R2O3).6Loss on ignition.7Moisture and other volatile material.13.2 ColorThe color shall be equal,within agreed upontolerances,to that of a reference sample agreed upon betweenthe purchaser and the seller.3.3 Coarse ParticlesThe pigment shall contain no morethan 2%of coarse particles,retained on a 45-m(No.325)sieve except as may be agreed upon between the purchaser andthe seller.3.4 Water-Soluble MatterThe pigment shall contain nomore than 1%water-soluble matter except as may be agreedupon between the purchaser and the seller.3.5 Oil AbsorptionThe oil absorption shall be equal,within agreed upon tolerances,to that of a reference sampleagreed upon between the purchaser and the seller.3.6 ConsistencyWhen consistency is included in the pur-chasers specification,it shall be equal,within agreed upontolerances,to that of a reference sample agreed upon betweenthe purchaser and the seller.3.7 FinenessThe paint fineness shall be equal,withinagreed upon tolerances,to that of a reference sample agreedupon between the purchaser 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 distinguishingbetween units of 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 after1This 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 Nov.1,2012.Published November 2012.Originallyapproved in 1941.Last previous edition approved in 2007 as D605 82(2007).DOI:10.1520/D0605-82R12.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 blending in equal quantities,the samples from the sameproduction unit form a composite sample.5.Test Methods5.1 Tests shall be conducted in accordance with the follow-ing ASTM test methods,where applicable.Test procedures notcovered by ASTM test methods shall be mutually agreed uponbetween the purchaser and the seller.5.1.1 Color,Composition,and Coarse ParticlesTestMethods D717.5.1.2 Water-Soluble Matter and Loss on IgnitionTestMethods D1208.5.1.3 Oil AbsorptionTest Method D281.5.1.4 ConsistencyUse the pigment to prepare a mixtureaccording to the following directions:Weigh 78 g of petroleumspirits and 80 g of linseed oil(viscosity,21 to 24 P;acidnumber,4 to 8)into a pint can and thoroughly mix with aspatula.Weigh in 16