ASTM_D_7733_-_12_2021.pdf

Designation:D773312(Reapproved 2021)Standard Specification forAcrylic Dispersion Ground1This standard is issued under the fixed designation D7733;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 standard specifies test methods which measureminimum qualities for acrylic dispersion grounds.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 standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 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:2D1640 Test Methods for Drying,Curing,or Film Formationof Organic CoatingsD3359 Test Methods for Rating Adhesion by Tape Test3.Terminology3.1 Definitions:3.1.1 flash-through,nthe visible evidence of oil on theopposite side of a support to which it was applied;also referredto as strike-through.3.1.2 gesso grounds,n:3.1.2.1 calcium hydroxide and water(“slaked lime”).3.1.2.2 calcium sulfate(“plaster of Paris”)or calcium car-bonate(chalk)prepared with a natural protein glue water.3.1.2.3 in contemporary usage,the term“gesso”is some-times used by manufacturers of acrylic dispersion products todescribe their products in a brand name.3.1.3 ground,na surface onto which an artist appliesdecorative coatings and paints.3.1.4 polymer,na long chain synthetic or naturally occur-ring molecule composed of smaller,repeating units calledmonomers.3.1.5 size,na liquid material that absorbs and penetratesinto a substrate preparing the substrate for a primer or groundby at least partially sealing the surface and creating moreintegrity and less absorption of the surface.3.1.6 strike-through,nsee flash-through.4.Significance and Use4.1 This specification establishes quality and performancerequirements and provides a basis for common understandingamong producers,distributors and users.4.2 It is not intended that all grounds meeting this require-ment be identical nor have uniform excellence in all respects.Variation in manufacture not covered in this specification maycause some artists to prefer one brand to another,either ofwhich may be acceptable by this specification.5.Labeling Requirements5.1 Acrylic dispersion products conforming to this standardwill include acrylic,polymer,dispersion polymer,or acrylicdispersion in their description to differentiate them fromtraditional gessoes.6.Quality Assurance6.1 Conditions not covered in this specification that affectthe quality of acrylic dispersion grounds:6.1.1 SubstrateFactors such as the texture,gloss,effectivepH,porosity,chemical composition and condition of thesubstrate will affect gloss,gloss uniformity,drying time,adhesion and the flexibility of the dried ground.6.1.2 EnvironmentalConditionsFactorssuchastemperature,humidity,airflow and light conditions affectapplication properties,film formation,drying time and adhe-sion.6.1.3 StorageFactors such as aging and high and lowtemperatures may cause changes in consistency.1This specification 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 Nov.1,2021.Published November 2021.Originallyapproved in 2012.Last previous edition approved in 2016 as D7733 12(2016).DOI:10.1520/D7733-12R21.2For 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?6.2 Wet Ground Properties:6.2.1 Viscosity/ConsistencyGrounds shall be smooth andconsistent except for functional particles that provide tooth.Paste type grounds may not flow or level;ready to brushgrounds will flow evenly.6.2.2 pHThe pH sha