ASTM_D_8330_-_20.pdf

Designation:D833020Standard Specification forArtists Pastels1This standard is issued under the fixed designation D8330;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 Thisspecificationestablishesrequirementsforcomposition,performance,and labeling of artists pastels.1.2 This specification includes requirements for identifica-tion and lightfastness.1.3 Pastel specimens are exposed to both natural daylightthrough window glass and window glass-filtered simulateddaylight radiation to determine the lightfastness category foreach pastel.1.4 The values stated in SI units are to be regarded asstandard.The values given in parentheses after SI units areprovided for information only and are not considered standard.1.5 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:2D1729 Practice for Visual Appraisal of Colors and ColorDifferences of Diffusely-Illuminated Opaque MaterialsD2244 Practice for Calculation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesD4236 Practice for Labeling Art Materials for ChronicHealth HazardsD4303 Test Methods for Lightfastness of Colorants Used inArtists MaterialsE284 Terminology of AppearanceG24 Practice for Conducting Exposures to Daylight FilteredThrough GlassG113 Terminology Relating to Natural and Artificial Weath-ering Tests of Nonmetallic MaterialsG151 Practice for Exposing Nonmetallic Materials inAccel-erated Test Devices that Use Laboratory Light SourcesG155 Practice for Operating Xenon Arc Light Apparatus forExposure of Non-Metallic Materials3.Terminology3.1 Definitions:3.1.1 Refer to Terminology E284 for appearance terms usedin this specification and to Terminology G113 for termsrelating to natural and artificial lightness tests.3.2 Definitions of Terms Specific to This Standard:3.2.1 pastel,na chalk-like stick,varying in hardness fromhard to soft,composed of minimal binder and colored andwhite pigments for obtaining shades and tints.3.2.2 substrate,nwhite,neutral pH,buffered,uncoatedpaper,or board,without optical brighteners,to which pastel isapplied.Some substrates are coated with a gritty layer to aid inadhesionthese are called sanded pastel papers or boards.4.Significance and Use4.1 This specification establishes quality requirements andprovides a basis for common understanding among producers,distributors,and users.4.2 It is not intended that all pastels meeting the require-ments be identical nor of uniform excellence in all respects.Variations in manufacture,not covered by this specification,may cause some artists to prefer one brand to another,either ofwhich may be acceptable under this specification.4.3 Variation in test results can be due to differences inpigment manufacture from time to time by a company,differ-ent properties of a pigment from company to company,different combinations of pigments and other ingredients,specimen preparation,thickness of pastel on substrate,differentinstruments and instrumental readings,variations in the surfaceof the specimen,and the conditions of exposure.Allowance forthese variations is made by establishing lightfastness categoriesthat include a range of color differences.4.4 Since a specific pastel may be unusually sensitive tosome aspect of simulated daylight accelerated lightfastnesstesting and show a change in color that would not occur in a1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.57 on Artist Paints and Related Materials.Current edition approved June 1,2020.Published June 2020.DOI:10.1520/D8330-20.2For 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.normal home or gallery environment,two types of exposureare required,both natural daylight and simulated daylight.4.5 Some variation in test results is to be expected evenwhen