Standard Practice for Evaluation of Aging Resistance of Prestressed Prepainted Metal In a Dry Heat Test

ABSTRACT
This practice details the standard procedure for evaluating the resistance of prestressed prepainted metal panels to cracking, or loss of adhesion, or both, after accelerated heat aging by dry heat test. This test method requires the use of gravity or forced air laboratory oven, bench vise, bending dies or test shims, 10x magnifier, and adhesive tape.
SCOPE
1.1 This practice can be used to evaluate the resistance of a prestressed prepainted metal panel to cracking, or loss of adhesion, or both, after accelerated heat aging. Most coil coated products are formed and bent into specific shapes to produce a final product. These operations introduce stresses, which may be relieved by cracking of the coating after aging.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 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.

General Information

Status
Published
Publication Date
28-Feb-2023
Drafting Committee
D01.53 - Coil Coated Metal

Relations

Effective Date
01-Jun-2010
Effective Date
25-Mar-1983
Effective Date
25-Mar-1983

Overview

ASTM D6491-09(2023), Standard Practice for Evaluation of Aging Resistance of Prestressed Prepainted Metal in a Dry Heat Test, provides a standardized procedure for determining the resistance of prestressed prepainted metal panels to cracking and loss of adhesion after undergoing accelerated aging in a dry heat environment. This standard is crucial for manufacturers, fabricators, and quality assurance professionals in assessing the performance and durability of coil-coated metal products after they have been subjected to manufacturing stresses and subsequent heat exposure. The process involves controlled oven testing and comprehensive inspection to evaluate any degradation such as coating cracks or loss of adhesion.

Key Topics

  • Accelerated Aging Evaluation
    Describes the method for exposing prestressed prepainted metal panels to a controlled dry heat environment, typically at 60°C (140°F) for 16 hours, to simulate long-term aging effects.

  • Cracking and Adhesion Assessment
    Addresses both visual and physical inspection for cracking and tape pick-off before and after heat aging, utilizing a 10x magnifier and adhesive tape. The assessment protocol follows a reproducible bending test and standardized reporting.

  • Equipment Requirements
    Outlines the necessary apparatus for the test, including:

    • Gravity or forced air laboratory oven
    • Bench vise with smooth jaws or inserts
    • Bending dies or test shims (optional)
    • 10x magnifier (optional)
    • Adhesive tape for adhesion testing
  • Test Specimen Preparation
    Procedures for preparing specimens, including dimensions, bend orientation (transverse or longitudinal to rolling direction), and fabrication temperature requirements.

  • Reporting Results
    Establishes guidelines for documenting substrate details, test parameters, observed cracking, and tape pick-off both before and after aging.

Applications

This ASTM standard is widely used across industries involved in the production and application of prestressed prepainted metal, such as construction, automotive, appliance manufacturing, and other sectors utilizing coil-coated steel or aluminum products. Key practical applications include:

  • Quality Assurance and Product Development
    Ensures that prepainted and coil coated metal products maintain their visual and functional integrity after forming, bending, and exposure to elevated temperatures.

  • Material Comparison and Selection
    Assists manufacturers and customers in evaluating and comparing the aging resistance of different coating systems or material batches, supporting informed procurement and production decisions.

  • Process Optimization
    Identifies potential weaknesses in coating or forming processes, allowing for improvements in manufacturing protocols to enhance product longevity and performance.

  • Customer Specification and Compliance
    Establishes a common, recognized basis for communication between coil coaters, fabricators, and end-users regarding performance expectations and acceptance criteria for the aging resistance of prepainted metals.

Related Standards

  • ASTM D4145 - Test Method for Coating Flexibility of Prepainted Sheet
    Frequently referenced in conjunction with ASTM D6491, this standard covers the assessment of coating flexibility through T-bend testing.

  • ASTM D01 Standards
    ASTM Committee D01 oversees the development of standards related to paints, coatings, and related materials, including those for aging, stress, adhesion, and performance evaluation.

  • International Standardization Principles
    This standard aligns with globally recognized guidelines on standard development, as recommended by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

For industries where durability and reliability of prepainted coil metals are critical, compliance with ASTM D6491-09(2023) is essential for verifying product performance under thermal stress and for maintaining quality standards in both domestic and international markets.

Buy Documents

Standard

ASTM D6491-09(2023) - Standard Practice for Evaluation of Aging Resistance of Prestressed Prepainted Metal In a Dry Heat Test

English language (2 pages)
sale 15% off
sale 15% off

Frequently Asked Questions

ASTM D6491-09(2023) is a standard published by ASTM International. Its full title is "Standard Practice for Evaluation of Aging Resistance of Prestressed Prepainted Metal In a Dry Heat Test". This standard covers: ABSTRACT This practice details the standard procedure for evaluating the resistance of prestressed prepainted metal panels to cracking, or loss of adhesion, or both, after accelerated heat aging by dry heat test. This test method requires the use of gravity or forced air laboratory oven, bench vise, bending dies or test shims, 10x magnifier, and adhesive tape. SCOPE 1.1 This practice can be used to evaluate the resistance of a prestressed prepainted metal panel to cracking, or loss of adhesion, or both, after accelerated heat aging. Most coil coated products are formed and bent into specific shapes to produce a final product. These operations introduce stresses, which may be relieved by cracking of the coating after aging. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 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.

ABSTRACT This practice details the standard procedure for evaluating the resistance of prestressed prepainted metal panels to cracking, or loss of adhesion, or both, after accelerated heat aging by dry heat test. This test method requires the use of gravity or forced air laboratory oven, bench vise, bending dies or test shims, 10x magnifier, and adhesive tape. SCOPE 1.1 This practice can be used to evaluate the resistance of a prestressed prepainted metal panel to cracking, or loss of adhesion, or both, after accelerated heat aging. Most coil coated products are formed and bent into specific shapes to produce a final product. These operations introduce stresses, which may be relieved by cracking of the coating after aging. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 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.

ASTM D6491-09(2023) is classified under the following ICS (International Classification for Standards) categories: 87.020 - Paint coating processes. The ICS classification helps identify the subject area and facilitates finding related standards.

ASTM D6491-09(2023) has the following relationships with other standards: It is inter standard links to ASTM D4145-10, ASTM D4145-83(2002), ASTM D4145-83(1996)e1. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

ASTM D6491-09(2023) is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


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.
Designation: D6491 − 09 (Reapproved 2023)
Standard Practice for
Evaluation of Aging Resistance of Prestressed Prepainted
Metal In a Dry Heat Test
This standard is issued under the fixed designation D6491; 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 3.2 Bench Vise, with smooth jaws or inserts, 130 mm (5 in.)
permanently mounted on a work table or bench, or alternative
1.1 This practice can be used to evaluate the resistance of a
equipment capable of making the appropriate bends.
prestressed prepainted metal panel to cracking, or loss of
3.3 Bending Dies or Test Shims, (optional).
adhesion, or both, after accelerated heat aging. Most coil
coated products are formed and bent into specific shapes to
3.4 10X magnifier, (optional).
produce a final product. These operations introduce stresses,
3.5 Adhesive Tape.
which may be relieved by cracking of the coating after aging.
1.2 The values stated in SI units are to be regarded as the 4. Test Specimens
standard. The values given in parentheses are for information
4.1 Cut samples 75 mm (3 in.) wide (across the bend
only.
direction) by whatever length is necessary to make the appro-
1.3 This standard does not purport to address all of the priate number of bends. The direction of the bend may be
transverse or longitudinal to the “rolling direction” of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- metal—or as agreed upon between customer and vendor.
priate safety, health, and environmental practices and deter-
5. Procedure
mine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accor-
5.1 Perform the fabrication at room temperature, 25 °C 6
dance with internationally recognized principles on standard-
1 °C (77 °F 6 2 °F). All test specimens should be equilibrated
ization established in the Decision on Principles for the
to the same temperature before fabricating. Different fabrica-
Development of International Standards, Guides and Recom-
tion temperatures may be used, when needed, to meet customer
mendations issued by the World Trade Organization Technical
or vendor requirements, or both.
Barriers to Trade (TBT) Committee.
5.2 Prepare three “T-bend” test specimens in accordance
with Test Method D4145. The T-bend used should be agreed
2. Referenced Documents
upon between customer and vendor.
2.1 ASTM Standards:
5.3 Examine the T-bend for cracking and tape pick-off in
D4145 Test Method for Coating Flexibility of Prepainted
accordance with Test Method D4145 and record the results.
Sheet
5.4 Place the formed test specimens in the 60 °C 6 3 °C
(140 °F 6 5 °F) oven for 16 h. Different ti
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.

Loading comments...