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ASTM D2620-87(1995)e1

(Test Method)

Standard Test Method for Light Stability of Clear Coatings (Withdrawn 2001)

Standard Test Method for Light Stability of Clear Coatings (Withdrawn 2001)

SCOPE
1.1 This test method covers the determination of the discoloration of clear coatings by sunlight through glass.  
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.  
1.3 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.

General Information

Status
Withdrawn
Publication Date
31-Dec-1994
Withdrawal Date
09-May-2001
ICS
87.040 - Paints and varnishes
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.55 - Factory Applied Coatings on Preformed Products
Current Stage
Ref Project

Relations

Referred By
ASTM D333-01(2021) - Standard Guide for Clear and Pigmented Lacquers
Effective Date
01-Jan-1995

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ASTM D2620-87(1995)e1 - Standard Test Method for Light Stability of Clear Coatings (Withdrawn 2001)ASTM D2620-87(1995)e1 - Standard Test Method for Light Stability of Clear Coatings (Withdrawn 2001)
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ASTM D2620-87(1995)e1 - Standard Test Method for Light Stability of Clear Coatings (Withdrawn 2001)
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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
e1
Designation: D 2620 – 87 (Reapproved 1995)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Light Stability of Clear Coatings
This standard is issued under the fixed designation D 2620; 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 (e) indicates an editorial change since the last revision or reapproval.
e NOTE—Keywords and unit of measurement statement were added editorially in May 1995.
1. Scope 5. Apparatus
1.1 This test method covers the determination of the discol- 5.1 Exposure Cabinet as described in Practice G 24.
oration of clear coatings by sunlight through glass.
6. Test Specimens
1.2 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are for 6.1 For each clear coating under test, use one test panel
approximately 3 by 5 in. (75 by 125 mm) of white carrara glass
information only.
or other specified substrate material.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
NOTE 1—Other materials that may be considered for this purpose
responsibility of the user of this standard to establish appro-
include: (1) White ceramic tile. (2) A white pigmented, light-stable coating
priate safety and health practices and determine the applica-
which would not be lifted by the clear topcoat. (A baking enamel with the
bility of regulatory limitations prior to use. composition of 30 % melamine formaldehyde resin and 70 % of the
phthalic anhydride/coconut alkyd resin with 3 lb/gal (1.36 kg/L) of
2. Referenced Documents
titanium dioxide per gallon has been found satisfactory.) (3) The substrate
intended for use with the clear coating. The light stability of the substrate
2.1 ASTM Standards:
may be determined by including an extra test panel without a clear
D 1729 Practice for Visual Evaluation of Color Differences
topcoat.
of Opaque Materials
3 6.2 Prepare specimens of the test materials by applying the
D 1925 Test Method for Yellowness Index of Plastics
coatings on the test panels to a dry film thickness of 2 6 0.2
G 24 Practice for Conducting Exposures to Daylight Fil-
mil (50 6 5 μm).
tered Through Glass
6.3 Prepare a reference specimen, representing a material of
3. Summary of Test Method known performance in this test, with each set of test specimens.
6.4 Record the panel preparation details: method of coating
3.1 The effect of sunlight on discoloration of clear coatings
application, baking conditions, film thickness, etc. These de-
is determined by exposing under glass, coated panels masked
tails will be established by mutual agreement between pur-
at one end, to natural sunlight for a specified time. At the end
chaser and seller in accordance with the type of product and its
of the exposure, the mask is removed and the panels evaluated
intended use.
for degree of discoloration.
7. Conditioning
4. Significance and Use
7.1 Unless otherwise specified, condition the coated panels
4.1 Color change, particularly yellowing, is not generally
at 73.5 6 3.5°F (23 6 2°C) and 50 6 5 % relative humidity for
acceptable to users of coatings when it is readily noticeable. In
48 h if baked, or 7 days if air dried.
designing clear coating systems for interior use on various
substrates, it is of interest to know how well the clear coats will
8. Procedure
resist color change caused by ambient light. This test method
8.1 Prior to exposure, mask one-half of each test panel with
permits the evaluation of the effect of natural indoor light on
aluminum foil to exclude sunlight from the other half of the
the color stability of clear coatings.
coating.
NOTE 2—The tape used
...

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FIG. 1 Alignment of Panels for Scrubbing
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5.1 Latex paints dry very quickly which often causes difficulty in final appearance of painted areas, especially paints formulated below 100g/L VOC where lower amounts of solvents are in the formulated latex paint. This method is a means of determining the time available before a test paint cannot be worked into a previously painted area.
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5.1 As the brush drag of a paint increases, any natural tendency on the part of the painter to overspread the paint is reduced. When all other factors are held constant, increased brush drag will result in greater film thickness with consequent improvement in durability and hiding. Conversely, sometimes it might be preferred to have a lesser degree of brush drag for easier application (that is, the amount of time and effort in applying a paint to a specific area is reduced with a lesser degree of brush drag).  
5.2 This test method provides a standardized brushout procedure for the evaluation of brush drag as an alternative to customary informal ad hoc procedures. Its objective is to maximize the reliability and precision with which this characteristic may be determined.
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SCOPE
1.1 This test method is a standardized brushout procedure for comparing the brush drag of architectural type solvent-borne paints.  
1.2 With slight modifications this test method is also applicable to solvent-borne paints.  
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
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1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM D2794-93(2024)(Test Method)
Standard Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact)

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5.1 Coatings attached to substrates are subjected to damaging impacts during the manufacture of articles and their use in service. In its use over many years, this test method for impact resistance has been found to be useful in predicting the performance of organic coatings for their ability to resist cracking caused by impacts.
SCOPE
1.1 This test method covers a procedure for rapidly deforming by impact a coating film and its substrate and for evaluating the effect of such deformation.  
1.2 This test method should be restricted to testing in only one laboratory when numerical values are used because of the poor reproducibility of the method. Interlaboratory agreement is improved when ranking is used in place of numerical values.  
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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