ImageVerifierCode 换一换
格式:PDF , 页数:4 ,大小:87.47KB ,
资源ID:523497      下载积分:5000 积分
快捷下载
登录下载
邮箱/手机:
温馨提示:
如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
如填写123,账号就是123,密码也是123。
特别说明:
请自助下载,系统不会自动发送文件的哦; 如果您已付费,想二次下载,请登录后访问:我的下载记录
支付方式: 支付宝扫码支付 微信扫码支付   
注意:如需开发票,请勿充值!
验证码:   换一换

加入VIP,免费下载
 

温馨提示:由于个人手机设置不同,如果发现不能下载,请复制以下地址【http://www.mydoc123.com/d-523497.html】到电脑端继续下载(重复下载不扣费)。

已注册用户请登录:
账号:
密码:
验证码:   换一换
  忘记密码?
三方登录: 微信登录  

下载须知

1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。
2: 试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。
3: 文件的所有权益归上传用户所有。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 本站仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

版权提示 | 免责声明

本文(ASTM D6762-2018 6250 Standard Test Method for Determining the Hiding Power of Paint by Visual Evaluation of Spray Applied Coatings.pdf)为本站会员(Iclinic170)主动上传,麦多课文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

ASTM D6762-2018 6250 Standard Test Method for Determining the Hiding Power of Paint by Visual Evaluation of Spray Applied Coatings.pdf

1、Designation: D6762 18Standard Test Method forDetermining the Hiding Power of Paint by Visual Evaluationof Spray Applied Coatings1This standard is issued under the fixed designation D6762; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revis

2、ion, 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 test method provides for the quantitative visualdetermination of the film thickness required to

3、achieve fullhiding. This film thickness is considered to be the hiding powerof a test paint.1.2 This method applies only to spray applied coatings butits concepts are valid for other methods of application as well.1.3 The values stated in inch-pound units are to be regardedas standard. The values gi

4、ven in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 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

5、 appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for

6、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:2D16 Terminology for Paint, Related Coatings, Materials, andApplicationsD609 Practice for Preparation of

7、Cold-Rolled Steel Panelsfor Testing Paint, Varnish, Conversion Coatings, andRelated Coating ProductsD1005 Test Method for Measurement of Dry-Film Thick-ness of Organic Coatings Using MicrometersD1729 Practice for Visual Appraisal of Colors and ColorDifferences of Diffusely-Illuminated Opaque Materia

8、lsD1730 Practices for Preparation of Aluminum andAluminum-Alloy Surfaces for PaintingD2805 Test Method for Hiding Power of Paints by Reflec-tometryD7091 Practice for Nondestructive Measurement of DryFilm Thickness of Nonmagnetic Coatings Applied toFerrous Metals and Nonmagnetic, Nonconductive Coat-i

9、ngs Applied to Non-Ferrous MetalsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3. Terminology3.1 DefinitionsFor definitions of terms used in this testmethod, refer to Terminology D16 and the Paint/CoatingsDictionary.34. Summary of Test Method4.1 The

10、test paint is applied by means of spray applicationin a wedge-shaped film over a black and white, black and grayor red and gray pattern so that a thickness variation is obtained,which provides excess hiding at one end of the pattern andpartial hiding at the other end of the pattern.4.2 The dry film

11、is examined under standard illumination toselect the point where the pattern just becomes obscured. Thethickness of the film at this point is designated the hidingpower of the paint.5. Significance and Use5.1 This test method determines hiding power of a test paintby visual evaluation of a spray app

12、lied coating.NOTE 1Test Method D2805 describes an instrumental method fordetermining hiding power. The paint film is applied at a uniform thickness(for example with a doctor blade), the film thickness is measuredrigorously, and the opacity is determined photometrically. Hiding power isthereby determ

13、ined with a high degree of precision.5.2 Test Method D6762 is less precise than Test MethodD2805, but is commonly used since it is more closely related1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct respons

14、ibility ofSubcommittee D01.26 on Optical Properties.Current edition approved Sept. 1, 2018. Published September 2018. Originallyapproved in 2002. Last previous edition approved in 2017 as D6762 02a (2017).DOI: 10.1520/D6762-18.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orc

15、ontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Published by the Federation of Societies for Coatings Technology, 492Norristown Rd., Blue Bell, PA 19422.Copyright ASTM International

16、, 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 a

17、nd Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1to the application characteristics of the paint and is simpler inconcept and evaluation.6. Apparatus6.1 Test Surface, a smooth-surfaced paper chart, approxi-mately 2 by 11 in., with a test pattern

18、having adjacent black andwhite, black and gray or red and gray areas and coated with asuitable coating so as to render the surface impervious to paintliquids.NOTE 2The red, gray, white and black areas should fall in thefollowing colorimetric range:CIE-Y % CAhARed 47 1018 2638Gray 2834White 8083Black

19、 1 maxAValid for Illuminant D6510or C2, with 0/45 geometry.6.2 Illumination, a light source providing diffuse light ofreasonable intensity, preferably northern sky light or an ap-proximation of the same (see Practice D1729).6.3 Backer Panel, 4 by 12 in. steel or aluminum panel. Alarger panel may be

20、used if desired.6.4 Film Thickness Measuring Device, a film thicknessmeasuring device in accordance with Test Methods D1005 orD7091.6.5 Spray Equipment, either a hand spray gun or an auto-matic spray machine.6.6 Oven, capable of maintaining the bake schedule for theproduct being evaluated.6.7 Tape,

21、masking or adhesive.7. Preparation of Wedge-shaped Paint Film (HandSpray)7.1 Prepare the backer panel in accordance with PracticesD609 or D1730.7.2 Attach the desired test pattern to one side of the backerpanel with masking tape or adhesive tape.7.3 Reduce the material being tested to spray viscosit

22、y.7.4 Attach spray gun to a suitable compressed air supplyline and adjust air pressure for consistent fan spray.7.5 Position the backer panel so that the long side is vertical.The panel should be placed so that the spray gun tip isapproximately 12 in. from the face of the panel.7.6 Prepare a wedge-s

23、haped film. An example of a proce-dure for preparing a wedge-shaped film by means of handspray is shown in Appendix X1.NOTE 3The film thickness should vary from partial hiding at one endto excess hiding at the other end, but the total variation from one end tothe other should not exceed 2 mils (50 m

24、).7.7 Remove the panel and flash and bake per the recom-mended bake schedule.8. Preparation of Wedge-shaped Paint Film (AutomaticSpray Machine)8.1 Prepare the backer panel in accordance with PracticesD609 or D1730.8.2 Attach the desired test pattern to the one side of thebacker panel with masking ta

25、pe or adhesive tape.8.3 Reduce the material being tested to spray viscosity.8.4 Position the backer panel on the panel holder so that thelong side is horizontal or vertical depending on the type ofspray machine being used.8.5 Prepare a wedge-shaped film. An example of a proce-dure for preparing a we

26、dge-shaped film by means of anautomatic spray machine is shown in Appendix X2.NOTE 4The film thickness should vary from partial hiding at one endto excess hiding at the other end, but the total variation from one end tothe other should not exceed 2 mils (50 m).8.6 Remove the panel and flash and bake

27、 per the recom-mended bake schedule.9. Evaluation Procedure9.1 Remove the panel from the oven and cool to roomtemperature.9.2 Examine the test panel, as shown in Fig. 1, underillumination conditions as described in 6.2 at a viewing angleperpendicular to the surface of the panel, and select the point

28、where the test pattern is just barely or no longer visible. Thedry film thickness at this point is considered to be the hidingpower of the coating.NOTE 5The viewing angle may change depending on customerrequirements.9.3 Measure the film thickness at the point of hiding inaccordance with Test Methods

29、 D1005 or D7091.FIG. 1 Test PanelD6762 18210. Report10.1 Report the coating under evaluation, with serial num-ber if applicable.10.2 Report the hiding power, as noted in 9.3, in mils (m).11. Precision and Bias411.1 Precision:11.1.1 An interlaboratory study of this test method wasconducted in which o

30、ne operator in each of six laboratoriesmade two determinations each on six samples of paint. Thesamples represented two paint samples at each of threedifferent levels of hiding power. The samples were analyzedstatistically in accordance with Practice E691. On the basis ofthe standard deviations show

31、n in Table 1, the following criteriashould be used for judging the acceptability of results at the95 % confidence level:11.1.1.1 RepeatabilityTwo results obtained by the sameoperator should be considered suspect if they differ by morethan the maximum allowable differences shown in Table 1,Section A.

32、11.1.1.2 ReproducibilityTwo results obtained by operatorsin different laboratories should be considered suspect if theydiffer by more than the maximum allowable differences shownin Table 1, Section B.11.2 No information can be presented on the bias of theprocedure in Test Method D6762 for measuring

33、hiding powerbecause no acceptable reference standard is available.12. Keywords12.1 hiding power; spray applied coating; visual evaluationAPPENDIXES(Nonmandatory Information)X1. PREPARATION OF WEDGE-SHAPED PAINT FILM BY HAND SPRAY (EXAMPLE)X1.1 Mount the panel vertically and spray the entire panelwit

34、h a uniform coat of the test material approximately 0.4 mil(10 m) thick.X1.2 Flash and then spray the lower34 of the panel with anadditional coat of the test material approximately 0.4 mil (10m) thick.X1.3 Flash and then progressively spray the remaininglower areas of the panel, for example, bottom1

35、2, bottom14,etc., until complete hiding is achieved near the center of thepanel.NOTE X1.1Allow sufficient flash time, as experience dictates, toprevent sagging or flooding.NOTE X1.2The film thickness should vary from partial hiding at oneend to excess hiding at the other end, but the total variation

36、 from one endto the other should not exceed 2 mils (50 m).X2. PREPARATION OF WEDGE-SHAPED PAINT FILM BY AUTOMATIC SPRAY MACHINE (EXAMPLE)X2.1 Spray a wedge-shaped film using an automatic spraymachine. The spray machine should be programmed to yieldthe following spray pattern:Portion 1 Portion 2 Port

37、ion 3 Portion 41 Pass 2 Passes 3 Passes 4 PassesX2.2 After spraying Portion 4, rotate the panel 180 andrepeat as shown below:4 Passes 3 Passes 2 Passes 1 PassTotal Total Total Total8 Passes 6 Passes 4 Passes 2 PassesNOTE X2.1Allow sufficient flash time, as experience dictates, toprevent sagging, flo

38、oding or popping.4Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D01-1126. ContactASTM CustomerService at serviceastm.org.TABLE 1 Precision of Hiding Power of Paint by Visual Evaluationof Spray Applied CoatingsHiding LevelmilsAv

39、eragemilsStandard DeviationmilsMaximum Allowable DifferenceMils (micrometers)A. Repeatability (single operator)0.60.8 0.7 0.09 0.25 (6.3)1.01.4 1.2 0.11 0.30 (7.6)1.62.2 2.0 0.07 0.21 (5.3)B. Reproducibility (between laboratories)0.6.08 0.7 0.16 0.45 (11.3)1.01.4 1.2 0.39 1.08 (7.6)1.62.2 2.0 0.48 1

40、.33 (33.8)D6762 183ASTM 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

41、of such rights, 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

42、 additional standardsand 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

43、to the ASTM Committee 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 a

44、t the aboveaddress 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:/ 184

copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
备案/许可证编号:苏ICP备17064731号-1