1、Designation:D76801(Reapproved 2019)Standard Specification forYellow Iron Oxide Hydrated1This standard is issued under the fixed designation D768;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 pa
2、rentheses 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 commerciallyknown as yellow iron oxide,hydrated.1.2 The values stated in SI units are to be regarded as thestanda
3、rd.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 i
4、ssued 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
5、 Hygroscopic Moisture(and OtherMatter Volatile Under the Test Conditions)in PigmentsD1208 Test Methods for Common Properties of CertainPigments3.Composition and Properties3.1 The pigment shall be a manufactured yellow iron oxideobtained by chemical reaction.It shall be a soft,finelypowdered pigment,
6、free of admixtures of other substances andshall conform to the following requirements:Total hydrated oxide of iron,min,%93Total oxide of iron,Amin,%83Loss on ignition,Amax,%13Moisture and other volatile matter,max,%1.0Water soluble matter,max,%0.50Coarse particles(total residue retained on a No.325(
7、45-m)sieve),max,%0.5Hydrogen ion concentration(pH value)4.5 to 8.0ATotal hydrated oxide of iron shall be the sum of iron oxide and loss on ignition.Loss on ignition shall be calculated on the dry material.3.2 Paste in OilThe paste in oil shall be made bythoroughly grinding the specified pigment with
8、 linseed oil(with or without a small amount of volatile thinner)togetherwith(where necessary)small amounts of wetting or dispersingagents to a semipaste or fluid type consistency.As received,itshall not be caked in the container and shall break up readily inoil to form a smooth paint of brushing con
9、sistency.It shall mixreadily in all proportions,without curdling,with linseed oil,turpentine,or volatile petroleum spirits,or any mixtures ofthese substances.The paste shall conform to the followingrequirements:Pigment,min,%55Nonvolatile vehicle,min,%of vehicle80Moisture by distillation,max,%2.0Coar
10、se particles and skins(total residue retained on aNo.325(45-m)sieve),max,percent of the drypigment1.0Consistency by the Stormer viscometer:At shearing rate of 100 revolutions/30 s,min,g700AAt shearing rate of 100 revolutions/35 s,max,g1200BAEquivalent to a rating of 125 Krebs Units.BEquivalent to a
11、rating of 145 Krebs Units.3.3 The mass color character of the tint and the tintingstrength formed by a mixture with a white pigment shall bewithin mutually agreed upon limits of a standard acceptable toboth the purchaser and the seller.4.Sampling4.1 Two samples shall be taken at random from differen
12、tpackages 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 each1This specification is under the jurisdiction of ASTM Committee D01 on
13、Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.31 on Pigment Specifications.Current edition approved June 1,2019.Published June 2019.Originallyapproved in 1944.Last previous edition approved in 2012 as D768 01(2012).DOI:10.1520/D0768-01R19.2F
14、or 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
15、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 O
16、rganization Technical Barriers to Trade(TBT)Committee.1 4540 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 GeneralTests shall be conducted in accordance withthe appropriate ASTM test methods.Test procedures notcovered by ASTM test methods shall be mutually agreed u
