1、Designation:D372105(Reapproved 2011)Standard Specification forSynthetic Red Iron Oxide Pigment1This standard is issued under the fixed designation D3721;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A numb
2、er 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 synthetic red iron oxide for usein paints and coatings manufactured by any of the following:1.1.1 Calcination of iron
3、 salts.1.1.2 Precipitation from iron salts.1.1.3 Calcination of synthetic iron oxide.1.1.4 Product of organic reduction.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 P
4、articles 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 CertainPigments3.Composition and Properties3.1
5、 Thepigmentshallconformtothefollowingrequirements:Fe2O3,min,%96.0Moisture and other volatile matter,max,%1.0Organic coloring matternoneCoarse particles(total residue retained on a 45-m(No.325)sieve)max,%1.0Matter soluble in water,max,%0.2pH value,min5.03.2 Inasmuch as iron oxide pigments are availab
6、le in a rangeof colors,the mass color and,if desired by the purchaser,thecharacter of the tint formed by mixture with a white pigmentshall be within mutually agreed upon limits of a referencesample mutually agreed upon between the seller and thepurchaser.This sample should be tested in accordance wi
7、thTest 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 samp
8、les for each10 000 lb(5000 kg),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 Test
9、s shall be conducted in accordance with the follow-ingASTM test methods.Test procedures not covered byASTMtest methods shall be mutually agreed upon between thepurchaser and the seller.5.1.1 Total Iron Oxide,Sulfur,and Organic ColoringMatterTest Methods D50.5.1.2 Moisture and Other Volatile MatterTe
10、st MethodsD280,Method A.5.1.3 Matter Soluble in WaterTest Methods D1208.5.1.4 Coarse Particles in Dry PigmentsTest MethodsD185.5.1.5 pH MinimumTest Methods D1208.5.1.6 Mass Color and Tinting StrengthTest Method D387.6.Keywords6.1 iron oxide;manganese;pigments1This specification is under the jurisdic
11、tion 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 1,2011.Published June 2011.Originallyapproved in 1978.Last previous edition approved in 2005 as D3721 05.D
12、OI:10.1520/D3721-05R11.2For 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 Harbo
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