ASTM D4941-2006(2010) Standard Practice for Preparing Drawdowns of Artists Paste Paints《画家用膏状颜料消耗品制备的标准操作规程》.pdf
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1、Designation: D4941 06 (Reapproved 2010)Standard Practice forPreparing Drawdowns of Artists Paste Paints1This standard is issued under the fixed designation D4941; 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 practice covers the production of uniform films ofartists tube paints and other nonflowing pigmented paintsusing paint ap
3、plicators designed for less viscous paints.1.2 Information on how to achieve opaque specimens fromthese paints is included.1.3 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.4 This standard does not purport to address all of
4、 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 Pain
5、t, Related Coatings, Materials,and ApplicationsD4838 Test Method for Determining the Relative TintingStrength of Chromatic PaintsE1164 Practice for Obtaining Spectrometric Data forObject-Color Evaluation3. Terminology3.1 DefinitionsSee Terminology D16 for definitions ofterms used in this practice.3.
6、2 Definitions of Terms Specific to This Standard:3.2.1 drawdown, na layer of paint deposited on a sub-strate by use of a drawdown bar for the evaluation of paintcharacteristics.3.2.2 drawdown bar, na metal applicator with a specifiedgap designed to deposit a wet paint film uniformly on aspecified te
7、st panel (for example, an opacity chart) or othersubstrate.4. Summary of Practice4.1 The paint is spread over the area of the test panel to becovered by the drawdown and the bar is pulled down withpressure just sufficient to avoid lifting of the bar from the chartsurface.4.2 Test panels are allowed
8、to dry in a dust-free environ-ment.4.3 If complete hiding (opacity) is needed and not producedby a single paint film, a second film is applied at a 90 angle tothe first. If required, additional layers may be applied using anarrower drawdown bar.5. Significance and Use5.1 Quality standards for artist
9、s paints require the evalua-tion of various appearance characteristics of paint films.Tinting strength determination (Test Method D4838) specifi-cally requires the preparation of drawdowns for colorimetricmeasurement. Other evaluations such as color designation,transparency, gloss, and color differe
10、nce measurements alsorequire drawdown samples.5.2 Artists tube paints have a paste consistency that makesthe use of traditional film application methods difficult, espe-cially for drying oil paints.5.3 Artists paints vary in two properties important to thepreparation of films, that is, transparency
11、and drying time.Colorimetric determination and some other types of evaluationrequire paint specimens that completely hide the substrate.Very transparent paints require such a thick film to producecomplete hiding that drying times is excessively long or thespecimen surface is blemished. When complete
12、 hiding isnecessary, this practice is designed to provide opaque filmswithout these defects through application of a series of thinfilms.6. Apparatus6.1 Drawdown Bars, two, of different widths with a clear-ance of 0.152 mm (0.006 in.). Recommended widths are 7.6cm (3 in.) and 15.2 cm (6 in.). The se
13、cond bar is required toprepare drawdowns with more than two layers. Wire wounddrawdown bars have been found to be unsuitable.6.2 Drawdown Charts, sealed paper type, half black andhalf white if transparency is being evaluated or opacity isnecessary.1This practice is under the jurisdiction of ASTM Com
14、mittee D01 on Paint andRelated Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.57 on Artist Paints and Related Materials.Current edition approved Dec. 1, 2010. Published December 2010. Originallyapproved in 1989. Last previous edition approved in 2006 as D49
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