ASTM_D_603_-_66_1996e1.pdf

Designation:D 603 66(Reapproved 1996)e1Standard Specification forAluminum Silicate Pigments(Hydrous)1This standard is issued under the fixed designation D 603;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(e)indicates an editorial change since the last revision or reapproval.e1NOTEKeywords were added editorially in May 1996.1.Scope1.1 This specification covers the white pigments that consistsubstantially of natural hydrous aluminum silicate2(of the 1:1layer type),and are restricted to those minerals which conformto the chemical limits prescribed herein and which can besuitably processed to what is commercially known as paintpigment quality.2.Referenced Documents2.1 ASTM Standards:D 281 Test Method for Oil Absorption of Pigments bySpatula Rub-Out3D 422 Test Method for Particle-Size Analysis of Soils4D 718 Test Methods for Analysis of Aluminum SilicatePigment5D 1208 Test Methods for Common Properties of CertainPigments5D 1483 Test Method for Oil Absorption of Pigments byGardner-Coleman Method3D 2448 Test Method for Water-Soluble Salts in Pigments byMeasuring the Specific Resistance of the Leachate of thePigment5E 70 Test Method for pH of Aqueous Solution with theGlass Electrode63.Composition of Properties3.1 PreparationThe pigment shall be made by grinding,milling,washing,purifying,size-fractionating,or otherwiseprocessing,natural hydrous aluminum silicates,and shallconform to the composition requirements(weight percent)given in Table 1.3.2 pHThe pH of a water slurry of the pigment shall bewithin a range as agreed upon between the purchaser and theseller.3.3 Water-Soluble MatterThe water-soluble matter shallbe not more than 0.50%.3.4 Wet-Sieve ResidueThe pigment shall contain no morethan 0.5%wet-sieve residue retained on a 45-m(No.325)sieve(“grit”or“coarse particles”)except as may be agreedupon between the purchaser and the seller.3.5 ColorThe color(brightness,reflectance)shall con-form to the following requirements:3.5.1 The color shall be equal,within agreed upon toler-ances,to that of a reference standard agreed upon between thepurchaser and the seller,or3.5.2 The color shall be not less than a guaranteed minimumexpressed as percent reflectance of standard illuminant C at457 nm compared to a freshly smoked standard magnesiumoxide surface by means of an accepted integrating spherereflectance spectrophotometer7or a monochromatic reflectancemeter,7or3.5.3 The color shall be specified by actual determination ofdominant wavelength,hue,and spectral efficiency as can becalculated from the tristimulus integration of the reflectancecurve.3.6 Oil AbsorptionThe oil absorption shall be equal,within agreed upon tolerances,to that of a reference standardagreed upon between the purchaser and the seller.3.7 Aluminum silicate pigments may be furnished in severaltypes or grades whose various properties are dependent in part1This specification is under the jurisdiction of ASTM Committee D-1 on Paintand Related Coatings,Materials,andApplications,and is the direct responsibility ofSubcommittee D01.31 on Pigment Specifications.Current edition approved Sept.20,1966.Originally issued 1941.ReplacesD 603 42(1955).2Synonymous terms are china clay and kaolinite.3Annual Book of ASTM Standards,Vol 06.01.4Annual Book of ASTM Standards,Vol 04.08.5Annual Book of ASTM Standards,Vol 06.03.6Annual Book of ASTM Standards,Vol 15.05.7The General Electric Reflectance Spectrophotometer and the General ElectricReflectance Meter,respectively,have been found satisfactory for this purpose.TABLE 1 Pigment Composition RequirementsIdealTypicalRangeMaxAluminum oxide,Al2O3,%39.5038.837 to 42A.Silicon dioxide,SiO2,%46.5445.448 to 43B.Iron oxide,Fe2O3,%.0.3.0.5Titanium dioxide,TiO2,%.1.5.2.0Calcium oxide,CaO,%.0.1.0.2Sodium oxide,Na2O,%.0.1.0.3Potassium oxide,K2O,%.0.1.2.0Other oxides,%.trace.0.1Free moisture(105C),%.1.0Loss on ignition(1000C),%13.9613.8.15.0APermitting up to 5%excess Al2O3,for example as allophane.BPermitting up to 5%excess SiO2,for example as quartz.1AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTMon average size or particle size distribution about the average,or both.The particle size shall be equal within agreed upontolerances to that of a reference standard agreed upon betweenthe purchaser and the seller.4.Number of Tests4.1 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 each10 000 lb(4540 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 a