ASTM D1212-1991(2007)e1 Standard Test Methods for Measurement of Wet Film Thickness of Organic Coatings 《有机涂层湿膜厚度测量的标准试验方法》.pdf
《ASTM D1212-1991(2007)e1 Standard Test Methods for Measurement of Wet Film Thickness of Organic Coatings 《有机涂层湿膜厚度测量的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D1212-1991(2007)e1 Standard Test Methods for Measurement of Wet Film Thickness of Organic Coatings 《有机涂层湿膜厚度测量的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D1212 91 (Reapproved 2007)1Standard Test Methods forMeasurement of Wet Film Thickness of Organic Coatings1This standard is issued under the fixed designation D1212; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the y
2、ear 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.1NOTEResearch report was added editorially to Test Method B in April 2012.1. Scope1.1 These test methods cover the determin
3、ation of wet filmthickness of organic coatings such as paint, varnish, andlacquer. Two methods are described as follows:1.1.1 In Test Method A, the Wet Film Thickness Gage(English or Metric graduation (see 5.1) is used to measure wetfilm thicknesses up to 60 mils on the English scale series, andup t
4、o 700 m on the metric scale series (Sections 5-8).1.1.2 In Test Method B, the Pfund Gage is used to measurewet film thicknesses up to 14.2 mils (360 m) (Sections 9-13).1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 Thi
5、s 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 Document
6、s2.1 ASTM Standards:2D823 Practices for Producing Films of Uniform Thicknessof Paint, Varnish, and Related Products on Test Panels3. Summary of Test Methods3.1 The material is applied in the laboratory to plane, rigidtest panels or in the field to the surface being coated. The wetfilm thickness is d
7、etermined as quickly as possible to reduceshrinkage due to solvent loss.3.2 In Test Method A, a gage with one eccentric and twoconcentric wheels is rolled over the surface and the point wherethe eccentric wheel first touches the wet film is determined.3.3 In Test Method B, a gage with a convex lower
8、 surface ispushed into the wet film until the center touches the substrate.The diameter of the spot of wet coating left on the convexsurface is measured and the film thickness calculated from thediameter of the spot and the radius of curvature.4. Significance and Use4.1 Wet film thickness measuremen
9、ts aid in the predictionof dry film thickness. In instances where dry film thicknesscannot be measured nondestructively, wet film thickness isfrequently specified. Also, the ability to determine wet filmthickness during application can provide the opportunity tocorrect the application procedures.TES
10、T METHOD A5. Apparatus5.1 Wet Film Thickness GageTwo versions of the gage arenow in use:3The original design as shown in Fig. 1 and a laterdesign as shown in Fig. 2. Both designs consists of an eccentriccenter wheel supported by two concentric wheels so as toprovide two scales that are bilaterally s
11、ymmetrical.As the gageis rolled on the film, there is a change in clearance between thewet film and the eccentric wheel. The point at which the filmfirst touches the center wheel measures the thickness of thefilm.5.2 The later design shown in Fig. 2, moves the eccentricwheel from between the concent
12、ric wheels, as shown in Fig. 1,to the outside of the gage and closer to one of the concentricwheels. Gage reading errors of parallax across the gage areeliminated as the two scales are placed directly on the eccentricwheel and errors when measuring on uneven support surfacesare reduced by placing th
13、e eccentric wheel closer to one of thesupporting concentric wheels.5.3 Best precision is obtained when using the near linearcentral portion of each scale, constituting about 80 % of itstotal range as shown in the diagram in Fig. 1 and Fig. 2.1These test methods are under the jurisdiction of ASTM Com
14、mittee D01 onPaint and Related Coatings, Materials, and Applications and are the directresponsibility of Subcommittee D01.23 on Physical Properties of Applied PaintFilms.Current edition approved June 1, 2007. Published June 2007. Originallyapproved in 1952. Last previous edition approved in 2001 as
15、D1212 - 91 (2001).DOI: 10.1520/D1212-91R07E01.2For 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.3Both versions
16、of this gage (Interchemical (INMONT) and Model “C”) arecovered by U.S. Patents 2 507 592 and 3 128 558 and are issued to Maynard R.Euverard. Interested parties are invited to submit information regarding theidentification of acceptable alternatives to this patented item to the Committee onStandards,
17、 ASTM Headquarters. Your comments will receive careful considerationat a meeting of the responsible technical committee, which you may attend.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Therefore, the range of the particular gage
18、 selected for useshould be such that the measured film thickness falls within,and preferably toward the center of the middle 80 % of eachscale. Gages are available covering the following ranges inmils and microns:Range, milsSmallestGraduation, mils0to2 0.10to4 0.22to12 0.510 to 30 1.020 to 60 2.0Ran
19、ge, mSmallestGraduation, m0to40 2.00 to 100 5.0050 to 250 10.00200 to 700 25.006. Procedure6.1 Apply the material in accordance with Practices D823 tosuitable plane rigid panels of area sufficiently large to permitfilm thickness measurements at least 25 mm (1 in.) from anyedge. Determine the film th
20、ickness immediately after applica-tion.6.2 Support the test panels on a suitable level base in sucha way that there will be no movement or spring of the panelsduring the film thickness measurements. Place the gage on thewet film so that the minimum marking is at the top and thegreatest clearance bet
21、ween the eccentric wheel and the film isdirectly over the wet film. Roll the gage over the film one-halfrevolution in one direction toward the minimum marking onthe gage and repeat in the opposite direction. Read the pointsat which the coating first makes contact with the eccentricwheel and determin
22、e the mean which is considered as onereading.6.3 If the coating contains a solvent that evaporates rapidlyor if the solids content is low, make at least a second separatereading on a freshly applied film and calculate the mean of theseparate readings.7. Report7.1 Report the mean of the separate read
23、ings and the rangeand smallest graduation of the gage used.8. Precision48.1 In an interlaboratory study of this test method, in whichtwo operators in at least six laboratories made measurements4Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Resear
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