ASTM D772-86(2005)

Standard Test Method for Evaluating Degree of Flaking (Scaling) of Exterior Paints

SIGNIFICANCE AND USE
Flaking (scaling) failure of paint films can occur in use. This test method provides a means of evaluating the degree of failure by comparing to pictorial standards.
SCOPE
1.1 This test method covers the evaluation of the degree of flaking (scaling) of exterior paints by comparison with photographic standards.
1.2 The values stated in SI 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: Historical
• Publication Date: 31-Aug-2005
• ICS: 87.040 - Paints and varnishes
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.25 - Evaluation of Weathering Effects

Relations

• Replaces: ASTM D772-86(2000) - Standard Test Method for Evaluating Degree of Flaking (Scaling) of Exterior Paints
• Effective Date: 01-Sep-2005
• Replaced By: ASTM D772-86(2011) - Standard Test Method for Evaluating Degree of Flaking (Scaling) of Exterior Paints
• Effective Date: 01-Nov-2011
• Referred By: ASTM D333-01(2021) - Standard Guide for Clear and Pigmented Lacquers
• Effective Date: 01-Sep-2005
• Referred By: ASTM D7254-21 - Standard Specification for Polypropylene (PP) Siding
• Effective Date: 01-Sep-2005
• Referred By: ASTM D822/D822M-13(2018) - Standard Practice for Filtered Open-Flame Carbon-Arc Exposures of Paint and Related Coatings
• Effective Date: 01-Sep-2005
• Referred By: ASTM E1605-22 - Standard Terminology Relating to Lead in Buildings
• Effective Date: 01-Sep-2005
• Referred By: ASTM D5324-16(2022) - Standard Guide for Testing Water-Borne Architectural Coatings
• Effective Date: 01-Sep-2005
• Referred By: ASTM D3361/D3361M-22 - Standard Practice for Unfiltered Open-Flame Carbon-Arc Exposures of Paint and Related Coatings
• Effective Date: 01-Sep-2005
• Referred By: ASTM D7856-21 - Standard Specification for Color and Appearance Retention of Solid and Variegated Color Plastic Siding Products using CIELab Color Space
• Effective Date: 01-Sep-2005
• Referred By: ASTM D3451-06(2017) - Standard Guide for Testing Coating Powders and Powder Coatings
• Effective Date: 01-Sep-2005
• Referred By: ASTM F1130-99(2020) - Standard Practice for Inspecting the Coating System of a Ship
• Effective Date: 01-Sep-2005
• Referred By: ASTM D6763-16(2022) - Standard Guide for Testing Exterior Wood Stains and Clear Water Repellents
• Effective Date: 01-Sep-2005
• Referred By: ASTM D5722-20 - Standard Practice for Performing Accelerated Outdoor Weathering of Factory-Coated Embossed Hardboard Using Concentrated Natural Sunlight and a Soak-Freeze-Thaw Procedure
• Effective Date: 01-Sep-2005
• Referred By: ASTM D1014-18 - Standard Practice for Conducting Exterior Exposure Tests of Paints and Coatings on Metal Substrates
• Effective Date: 01-Sep-2005
• Referred By: ASTM D4587-23 - Standard Practice for Fluorescent UV-Condensation Exposures of Paint and Related Coatings
• Effective Date: 01-Sep-2005

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D772–86(Reapproved2005)
Standard Test Method for
Evaluating Degree of Flaking (Scaling) of Exterior Paints
This standard is issued under the fixed designation D772; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 3.2.1 Discussion—Flaking (scaling) is generally preceded
by cracking or checking or blistering, and is the result of loss
1.1 This test method covers the evaluation of the degree of
of adhesion, usually due to stress-strain factors coming into
flaking (scaling) of exterior paints by comparison with photo-
play.
graphic standards.
1.2 The values stated in SI units are to be regarded as the
4. Significance and Use
standard. The values given in parentheses are for information
4.1 Flaking (scaling) failure of paint films can occur in use.
only.
This test method provides a means of evaluating the degree of
1.3 This standard does not purport to address all of the
failure by comparing to pictorial standards.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Type of Flaking (Scaling)
priate safety and health practices and determine the applica-
5.1 Only one type of flaking (scaling) is recognized, as
bility of regulatory limitations prior to use.
defined in Section 3.
2. Referenced Documents
6. Use of Photographic Reference Standards
2.1 ASTM Standards:
6.1 The photographic reference standards that are part of
D1150 Single and Multi-Panel Forms for Recording Results
3 this test method and are provided in the Pictorial Standards of
of Exposure Tests of Paints
Coating Defects Handbook are representative of the degree of
2.2 Other Standards:
4 cracking of exterior paint films. Fig. 1 is for illustration
Pictorial Standards of Coating Defects Handbook
purposes only and should not be used for evaluation.
3. Terminology 6.2 The use of the photographic reference standards illus-
trated in Fig. 1 requires the following precautions:
3.1 Definitions of Terms Specific to This Standard:
6.2.1 Care must be taken not to confuse various types of
3.2 flaking (scaling), n—that phenomenon manifested in
failure that may be present on the same surface.
paint films by the actual detachment of pieces of the film itself
6.2.2 It must be realized that degree of failure will vary over
either from its substrate or from paint previously applied.
any given area. Therefore, an average portion of the film
should be used for comparison. On larger surfaces it is
recommended that ratings be made at several locations and the
This test method is under the jurisdiction of ASTM Committee D01 on Paint
mean and range reported.
and Related Coatings, Materials, andApplications and is the direct responsibility of
6.2.3 In technical literature, a distinction is sometimes made
Subcommittee D01.25 on Evaluation of Weathering Effects.
Current edition approved Sept. 1, 2005. Published December 2005. Originally between flaking and scaling. In most cases, however, flaking
approved in 1944. Last previous edition approved in 2000 as D772 – 86 (2000).
and scaling refer to the same phenomenon. In some instances,
DOI: 10.1520/D0772-86R05.
the term flaking is used to describe the detachment of pieces of
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