ASTM D3928-00a(2005)
(Test Method)Standard Test Method for Evaluation of Gloss or Sheen Uniformity
Standard Test Method for Evaluation of Gloss or Sheen Uniformity
SIGNIFICANCE AND USE
When coatings are applied to large flat surfaces such as walls, the film thickness may vary or there may be small areas missed entirely (holidays) when the color of the fresh material and the previous film are very similar. It is much less costly if these areas can be touched up instead of having to repaint the entire surface.
Thickness is also affected in the locations where an area coated a short time before is joined with the area currently being coated (laps). An application technique that may affect the final appearance of the film is brushing or rolling the material in different directions in adjacent areas.
Both buyers and sellers are interested in determining whether a coating can be applied without exhibiting areas that differ in appearance because of laps and brush or roller marks, and whether it can be readily touched up to provide a uniform appearance in regard to gloss or sheen and all other aspects.
SCOPE
1.1 This test method covers the determination of the uniformity of gloss or sheen of a paint applied by brush to a test panel simulating an interior wall section. Variations in gloss or sheen that may be caused by short wet edge time, poor leveling, and pigment orientation or flotation during and after application are evaluated visually.
1.2 Because both the application and the panel evaluation are very subjective, this test method should be used only for comparative testing within one laboratory as the ratings assigned by different laboratories do not usually agree (see 8.1).
1.3 The values given in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:D3928–00a(Reapproved2005)
Standard Test Method for
Evaluation of Gloss or Sheen Uniformity
This standard is issued under the fixed designation D3928; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope the final appearance of the film is brushing or rolling the
material in different directions in adjacent areas.
1.1 This test method covers the determination of the unifor-
3.3 Both buyers and sellers are interested in determining
mityofglossorsheenofapaintappliedbybrushtoatestpanel
whether a coating can be applied without exhibiting areas that
simulating an interior wall section. Variations in gloss or sheen
differ in appearance because of laps and brush or roller marks,
that may be caused by short wet edge time, poor leveling, and
and whether it can be readily touched up to provide a uniform
pigmentorientationorflotationduringandafterapplicationare
appearance in regard to gloss or sheen and all other aspects.
evaluated visually.
1.2 Because both the application and the panel evaluation
4. Apparatus
are very subjective, this test method should be used only for
4.1 Paint Brush , 50 mm (2 in.) wide with polyester
comparative testing within one laboratory as the ratings as-
3 9
filaments70mm(2 ⁄4in.)long,chiseltip15mm( ⁄16in.)thick.
signed by different laboratories do not usually agree (see 8.1).
Previously used brushes are preferred.
1.3 The values given in SI units are to be regarded as the
4.2 Paint Brush, 25 mm (1 in.) wide with polyester fila-
standard. The values given in parentheses are for information
1 7
ments 57 mm (2 ⁄4 in.) long, chisel tip 10 mm ( ⁄16 in. ) thick.
only.
Previously used brushes are preferred.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Reagents and Materials
responsibility of the user of this standard to establish appro-
5.1 Laminated Fiber Board, 610 by 300 mm (24 by 12 in. )
priate safety and health practices and determine the applica-
with at least one smooth side.
bility of regulatory limitations prior to use.
5.2 Latex-Base Primer.
2. Summary of Test Method 5.3 Control Paint (optional)—Since there are no standard
panels, photographs, or paints for this test method, an agreed-
2.1 Paint is brush applied to a test panel using procedures
upon paint of known uniformity of appearance should be
and conditions that are most likely to cause nonuniformity of
included with the test paints as a control, unless the paints are
gloss or sheen. The dry film is then viewed under conditions
only ranked.
that accentuate variations in gloss or sheen and the overall
appearance is evaluated.
6. Procedure
6.1 Apply the latex primer by spray to the entire face of a
3. Significance and Use
smooth side of the test panel so as to coat it uniformly at a
3.1 When coatings are applied to large flat surfaces such as
2 2
spreading rate of about 11 m /gal/L (450 ft ).
walls, the film thickness may vary or there may be small areas
6.2 Air dry at least 18 h under standard conditions of 23 6
missed entirely (holidays) when the color of the fresh material
2°C (73.5 6 3.5°F) and 50 6 5 % relative humidity and
and the previous film are very similar. It is much less costly if
examine the panel for uniformity of primer application. If this
these areas can be touched up instead of having to repaint the
appears satisfactory, divide the coated area into sectionsAand
entire surface.
B as shown in Fig. 1.
3.2 Thickness is also affected in the locations where an area
6.3 Mount the panel vertically and position it as shown in
coated a short time before is joined with the area currently
Fig. 1 with Section A to the right and Section B to the left of
being coated (laps). An application technique that may affect
The sole source of supply of a polyester brush No. B-20CS, known to the
This test method is under the jurisdiction of ASTM Committee D01 on Paint committee at this time is The Leneta Co., 15 Whitney Rd., Mahwah, NJ 07430. If
and Related Coatings, Materials, andApplications and is the direct responsibility of you are aware of alternative suppliers, please provide this information to ASTM
Subcommittee D01.42 on Architectural Coatings. International Headquarters. Your comments will receive careful consideration at a
Current edition approved May 15, 2005. Published June 2005. Originally meeting of the responsible technical committee, which you may attend.
approved in 1980. Last previous edition approved in 2000 as D3928 – 00a. DOI: Similar to U.S. Federal Specification TT-P-650c Primer Coating Latex Base,
10.1520/D3928-00AR05. White (for Gypsum Wallboard).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D3928–00a (2005)
* Direction of finishing brush strokes
FIG. 1 Test Panel
the operator. Before painting, wet the brush with water if latex tocrossbrushafigureXonthissectionasshowninFig.1,area
paints are to be tested or VM & P naphtha if the test paints are D. Air dry for at least 18 h under standard conditions.
solvent reducible. Shake out as much liquid as possible bef
...
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