ASTM_D_3724_-_01_2019.pdf

Designation:D372401(Reapproved 2019)Standard Specification forSynthetic Brown Iron Oxide Pigment1This standard is issued under the fixed designation D3724;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 pigments commerciallyknown as synthetic pure brown iron oxides and blends.Thesepigments are suitable for use in paints and coatings.Methodsof manufacture are:1.1.1 Precipitation of iron salts.1.1.2 Calcination of precipitated iron oxides.1.1.3 Blends of synthetic red,yellow,and black iron oxides.1.1.4 Blends of synthetic red,yellow,and black iron oxidesplus the addition of carbon black to a maximum of 5.0%.Small amounts of carbon black are added to obtain tintingcolors not obtainable when synthetic brown iron oxide orcarbon black are used singly.1.2 The values stated in SI units are to be regarded 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 Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D50 Test Methods for ChemicalAnalysis of Yellow,Orange,Red,and Brown Pigments Containing Iron and Manga-neseD185 Test Methods for Coarse Particles in PigmentsD280 Test Methods for Hygroscopic Moisture(and OtherMatter Volatile Under the Test Conditions)in PigmentsD387 Test Method for Color and Strength of ChromaticPigments with a Mechanical MullerD1208 Test Methods for Common Properties of CertainPigmentsD3872 Test Method for Ferrous Iron in Iron OxidesE350 Test Methods for Chemical Analysis of Carbon Steel,Low-Alloy Steel,Silicon Electrical Steel,Ingot Iron,andWrought IronE351 Test Methods for ChemicalAnalysis of Cast IronAllTypes3.Composition and Properties3.1 The pigment shall be a manufactured iron oxide or ablend.It shall be a soft dry finely pulverized pigment and shallconform to the following requirements:FeO0 to 10%Fe2O383 to 98%Carbon black,max,%5.0%Moisture and other volatile matter,max,%1.0%Organic coloring matternoneTotal sulfates expressed as SO3,max,%2.0%Coarse particles(total residue retained on No.325(45-m)mesh sieve,max,%1.0%Matter soluble in water,max,%0.5%3.2 Inasmuch as synthetic brown iron oxides are available ina wide range of shades.The mass color and character of the tintand the tinting strength formed by a mixture with a whitepigment shall be within mutually agreed upon limits of astandard acceptable to both the purchaser and the seller whentested by Test Method D387.4.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 or 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 Methods5.1 Tests shall be conducted in accordance with the appro-priate ASTM test methods.Test procedures not covered byASTM test methods shall be mutually agreed upon between thepurchaser and the seller.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 Oct.1,2019.Published October 2019.Originallyapproved in 1978.Last previous edition approved in 2012 as D3724 01(2012).DOI:10.1520/D3724-01R19.2For 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 StatesThis international standard was developed in accordance with internationally 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.1 5.1.1 Total Iron Oxide,Sulfur and Organic ColoringMatterTest Methods D50.5.1.2 Ferrous Iron ContentTest Method D3872.5.1.3 Moisture and Other Volatile MatterTest MethodsD280Use Method A for pigments containing less than 8%ferrous iron oxide.Use Method B for