ASTM_D_2218_-_67_2012.pdf

Designation:D221867(Reapproved 2012)Standard Specification forMolybdate Orange Pigments1This standard is issued under the fixed designation D2218;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 the pigment known as molyb-date orange.1.2 The values stated in SI units are to be regarded asstandard.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:2D126 Test Methods for Analysis of Yellow,Orange,andGreen Pigments Containing Lead Chromate and Chro-mium Oxide GreenD185 Test Methods for Coarse Particles in PigmentsD235 Specification for Mineral Spirits(Petroleum Spirits)(Hydrocarbon Dry Cleaning Solvent)D387 Test Method for Color and Strength of ChromaticPigments with a Mechanical MullerD523 Test Method for Specular GlossD600 Specification for Liquid Paint DriersD822 Practice for Filtered Open-Flame Carbon-Arc Expo-sures of Paint and Related CoatingsD1210 Test Method for Fineness of Dispersion of Pigment-Vehicle Systems by Hegman-Type GageE97 Method of Test for Directional Reflectance Factor,45-Deg 0-Deg,of Opaque Specimens by Broad-BandFilter Reflectometry(Withdrawn 1991)32.2 Federal Specification:TT-R-266 Resin,Alkyd;Solutions43.Composition and Properties3.1 Dry PigmentThe pigment shall be a product made bythe chemical coprecipitation of lead chromate and leadmolybdate,with or without admixtures of other insolublecompounds of lead or other materials used in manufacture tocontrol certain properties.The pigment shall conform to therequirements for chemical composition as prescribed in Table1.3.2 The mass color and character of the tint formed by amixture with a white pigment shall be the same as,and thestrength shall be within mutually agreed upon limits of astandard acceptable to both the purchaser and the seller.3.3 When mutually agreed upon between the purchaser andthe seller as being essential to the end use of the pigment,resistance to loss of gloss,chalking,and color change shall betested as specified in 5.1.6 The exposed panel shall show nochalking,a loss of not more than 10%of the original gloss,and a color change difference of not more than three units.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 each4540 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 samplesfrom the same production unit may be blended in equalquantities to form a composite sample.5.Test Methods5.1 Tests shall be conducted in accordance with the follow-ing ASTM test methods: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 1,2012.Published August 2012.Originallyapproved in 1963.Last previous edition approved in 2006 as D2218 67(2006).DOI:10.1520/D221867R12.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/www.dodssp.daps.mil.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.1.1 Chemical Analysis of Lead ChromateProceed inaccordance with the Lead Chromate section of Test MethodsD126.The alternative procedure is not applicable.5.1.2 Chemical Analysis of Lead Molybdate and TotalMolybdenumWeigh to 1 mg about 1-g sample of pigmentinto a 250-mL beaker.Add 20 mL of sulfuric acid(H2SO4,1+1)and heat to light fumes.Cool the solution,dilute to 150mL,filter,and wash with water.To reduce chromate,addfreshly prepared sulfurous acid(H2SO3)until the solution turnsgreen,and then add several millilitres in excess.Boil thesolution until excess H2SO3is removed.Cool the solution to 5to 10C,and add 30 m