ASTM_D_2830_-_96.pdf

Designation:D 2830 96Standard Test Method forExterior Durability of Factory-Primed Field Finished WoodProducts1This standard is issued under the fixed designation D 2830;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.1.Scope1.1 This test method provides for the determination of therelative durability of factory-primed wood and wood-basedsubstrates with representative finish coats when exposed to theweather.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:D 659 Test Method of Evaluating Degree of Chalking ofExterior Paints2D 660 Test Method for Evaluating Degree of Checking ofExterior Paints2D 661 Test Method for Evaluating Degree of Cracking ofExterior Paints2D 662 Test Method for Evaluating Degree of Erosion ofExterior Paints2D 714 Test Method for Evaluating Degree of Blistering ofPaints2D 772 Test Method for Evaluating Degree of Flaking(Scal-ing)of Exterior Paints2D 1006 Practice for Conducting Exterior Exposure Tests ofPaints on Wood2D 3274 Test Method for Evaluating Degree of SurfaceDisfigurement of Paint Films by Microbial(Fungal orAlgal)Growth or Soil and Dirt Accumulation2D 3359 Test Methods for Measuring Adhesion by TapeTest22.2US.Federal jStandards:3TT-P-96bTT-P-1023.Summary of Test Method3.1 This test method consists of the atmospheric exposure ofat least three types of conventional exterior white house paintsapplied to panels of factory-primed wood or wood-base sub-strates that have been exposed to atmospheric weatheringconditions for periods of 0,3,and 6 months.3.2 The finish coats are applied by brush.3.3 An additional panel of original factory-primed substrate,without finish coat,is exposed for the duration of the test.4.Significance and Use4.1 This test method is useful for evaluating the weatheringperformance of factory-applied primers on wood or wood-based substrates overcoated with a field-applied topcoat.4.2 This test method is useful for evaluating the weatheringcompatibility of commercial topcoats over factory-appliedprimers on wood or wood-based substrates.5.Apparatus5.1 Avertical(90 from horizontal)test fence constructed inaccordance with requirements of Practice D 1006.6.Materials6.1 Exterior Finishes:6.1.1 Paint,Oil,Alkyd,fume resistant,conforming to Fed-eral Specification TT-P-102.6.1.2 Resin Latex Paint,Synthetic,of the emulsion typedesigned for use on exterior wood surfaces(such as TT-P-96b).6.1.3 Flat Alkyd,Solvent-Thinned,Exterior.6.1.4 Any other type of exterior finish paint mutually agreedupon.6.2 Bristle Brush(Natural or Synthetic).7.Procedure7.1 The minimum length of panel is 910 mm(3 ft)with aminimum width of 150 mm(6 in.)of a particular preprimedsubstrate.7.2 Mark off one third of the panel area(in a manner whichwill not damage the prime coat)and apply by brush to the rightone third panel area a single coat of one of the white finishesat a spreading rate as recommended by the manufacturer or by1This test method is under the jurisdiction of ASTM Committee D-1 on Paintand Related Coatings,Materials,and Applicationsand is the direct responsibility ofSubcommittee D01.52on Factory-Coated Wood Products.Current edition approved Nov.10,1996.Published January 1997.Originallypublished as D 2830 69.Last previous edition D 2830 91.2Annual Book of ASTM Standards,Vol 06.01.3Available from Standardization Documents Order Desk,Bldg.4 Section D,700Robbins Ave.,Philadelphia,PA 19111-5094,Attn:NPODS.1AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTMthe appropriate Federal specification.Paint the panel and dryindoors for 7 days under prevailing conditions of temperatureand humidity,taking care to avoid exposure to drafts orexcessive heat.7.3 Determine the spreading rate of the finish paints by theweight difference method or other suitable methods.Recordthe spreading rate,film thickness,and method used.7.4 Fasten the panel to a south exposure rack.NOTE1Panel mounting should be the same as normal practice for themounting of a particular substrate.7.5 After 3 months(61 week)of exposure of the panel,coatthe center one third section adjacent to the section alreadycoated with exterior finish as specified in 7.2.NOTE2If possible,the application should be made in the laboratoryas in 6.2.No washing or cleaning should be done to the surface to becoated.7.6 At completio