ASTM_D_7855_-_D_7855M_-_13.pdf

Designation:D7855/D7855M13Standard Test Method forDetermination of Mold Growth on Coated Building ProductsDesigned for Interior Applications Using an EnvironmentalChamber and Indirect Inoculation1This standard is issued under the fixed designation D7855/D7855M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers an environmental chamber andthe conditions of operation to evaluate in a 4-week period therelative resistance to mold growth and microbial surfacedefacement on coated building products designed for interiorapplication using an indirect inoculation method.The appara-tus is designed so it can be easily built or obtained by anyinterested party.1.2 This test method can be used to evaluate the compara-tive resistance of coated building products to accelerated moldgrowth.Ratings do not imply a specific time period that thecoated building product will be free of fungal growth duringinstallation in an interior environment.1.3 This test method is not intended for use in the evaluationof public health claims.1.4 The test method is intended for the accelerated evalua-tion of mold growth on a coated building product designed forinterior use.This method is not intended for evaluation ofsurfaces designed for exterior applications or uncoated sur-faces.Use of this test method for evaluating exterior perfor-mance has not been validated,nor have the limitations for suchuse been determined.1.5 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.6 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D16 Terminology for Paint,Related Coatings,Materials,andApplicationsD1193 Specification for Reagent WaterD6329 Guide for Developing Methodology for Evaluatingthe Ability of Indoor Materials to Support MicrobialGrowth Using Static Environmental ChambersE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 DefinitionsFor definitions of terms refer to Terminol-ogy D16.3.2 Definitions of Terms Specific to This Standard:3.2.1 chamber control,nopen Petri dish containing appro-priate agar to demonstrate viability of fungal organisms withinthe environmental chamber.3.2.2 coated building product,na building material hav-ing a liquid,liquefiable or mastic composition that is convertedto a solid protective,decorative,or functional adherent filmafter application as a thin layer onto a building fabric.3.2.3 interior,nany surface not exposed to exterior envi-ronments in end use.3.2.4 interior finish,ninterior wall and ceiling finish andinterior floor finish.3.2.5 material control,nuntreated representative sub-strate.3.2.6 sample,na portion of material taken from a largerquantity for the purpose of estimating properties or composi-tion of the larger quantity.3.2.7 sample tests,na group of samples(one or more).1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.28 on Biodeterioration.Current edition approved Oct.1,2013.Published November 2013.DOI:10.1520/D7855_D7855M13.2For 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 States1 3.2.8 test run,nthe evaluation of coated building productsin accordance with the procedure outlined in this test method.3.2.9 test specimen,na portion of a test unit needed toobtain a single test determination.4.Summary of Test Method4.1 This test method is an indirect inoculation to a coatedinterior building product of two fungal organisms,Aspergillusniger and Penicillium citrinum.Test specimens are placed in anenvironmental chamber maintained at 30 6 2C 86 6 3.6Fand at greater than 90%relative humidity for four weeks.Humidity is maintained by adding sufficient sterile DI water tothe bottom of the covered test chamber.A continuous fungalinoculation is provided by open Petri dishes supporting sevenday cult