1、Designation: D3928 00a (Reapproved 2018)Standard Test Method forEvaluation of Gloss or Sheen Uniformity1This standard is issued under the fixed designation D3928; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last rev
2、ision. 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 test method covers the determination of the unifor-mity of gloss or sheen of a paint applied by brush to a test panelsimu
3、lating an interior wall section. Variations in gloss or sheenthat may be caused by short wet edge time, poor leveling, andpigment orientation or flotation during and after application areevaluated visually.1.2 Because both the application and the panel evaluationare very subjective, this test method
4、 should be used only forcomparative testing within one laboratory as the ratings as-signed by different laboratories do not usually agree (see 8.1).1.3 The values given in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.4 This standard does not p
5、urport 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.1.5 This international stan
6、dard 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. S
7、ummary of Test Method2.1 Paint is brush applied to a test panel using proceduresand conditions that are most likely to cause nonuniformity ofgloss or sheen. The dry film is then viewed under conditionsthat accentuate variations in gloss or sheen and the overallappearance is evaluated.3. Significance
8、 and Use3.1 When coatings are applied to large flat surfaces such aswalls, the film thickness may vary or there may be small areasmissed entirely (holidays) when the color of the fresh materialand the previous film are very similar. It is much less costly ifthese areas can be touched up instead of h
9、aving to repaint theentire surface.3.2 Thickness is also affected in the locations where an areacoated a short time before is joined with the area currentlybeing coated (laps). An application technique that may affectthe final appearance of the film is brushing or rolling thematerial in different di
10、rections in adjacent areas.3.3 Both buyers and sellers are interested in determiningwhether a coating can be applied without exhibiting areas thatdiffer in appearance because of laps and brush or roller marks,and whether it can be readily touched up to provide a uniformappearance in regard to gloss
11、or sheen and all other aspects.4. Apparatus4.1 Paint Brush,250 mm (2 in.) wide with polyesterfilaments 70 mm (234 in.) long, chisel tip 15 mm (916 in.) thick.Previously used brushes are preferred.4.2 Paint Brush, 25 mm (1 in.) wide with polyester fila-ments 57 mm (214 in.) long, chisel tip 10 mm (71
12、6 in. ) thick.Previously used brushes are preferred.5. Reagents and Materials5.1 Laminated Fiber Board, 610 by 300 mm (24 by 12 in. )with at least one smooth side.5.2 Latex-Base Primer.35.3 Control Paint (optional)Since there are no standardpanels, photographs, or paints for this test method, an agr
13、eed-upon paint of known uniformity of appearance should beincluded with the test paints as a control, unless the paints areonly ranked.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct responsibility ofSubcom
14、mittee D01.42 on Architectural Coatings.Current edition approved June 1, 2018. Published June 2018. Originallyapproved in 1980. Last previous edition approved in 2014 as D3928 00a (2014).DOI: 10.1520/D3928-00AR18.2The sole source of supply of a polyester brush No. B-20CS, known to thecommittee at th
15、is time is The Leneta Co., 15 Whitney Rd., Mahwah, NJ 07430. Ifyou are aware of alternative suppliers, please provide this information to ASTMInternational Headquarters. Your comments will receive careful consideration at ameeting of the responsible technical committee,1which you may attend.3Similar
16、 to U.S. Federal Specification TT-P-650c Primer Coating Latex Base,White (for Gypsum Wallboard).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 pri
17、nciples 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.16. Procedure6.1 Apply the latex primer by spray to the entire face of asm
18、ooth side of the test panel so as to coat it uniformly at aspreading rate of about 11 m2/gal/L (450 ft2).6.2 Air dry at least 18 h under standard conditions of 23 62C (73.5 6 3.5F) and 50 6 5 % relative humidity andexamine the panel for uniformity of primer application. If thisappears satisfactory,
19、divide the coated area into sections A andB as shown in Fig. 1.6.3 Mount the panel vertically and position it as shown inFig. 1 with Section A to the right and Section B to the left ofthe operator. Before painting, wet the brush with water if latexpaints are to be tested or VM sheen uniformity; touc
20、h-upASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights,
21、 are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional sta
22、ndardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Com
23、mittee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddr
24、ess or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 00a (2018)3
