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  • ASTM
    D4145-10 Standard Test Method for Coating Flexibility of Prepainted Sheet (Redline)
    Edition: 2010
    $144.00
    Unlimited Users per year

Description of ASTM-D4145 2010

ASTM D4145 - 10

Standard Test Method for Coating Flexibility of Prepainted Sheet

Active Standard ASTM D4145 | Developed by Subcommittee: D01.53

Book of Standards Volume: 06.02




ASTM D4145

Significance and Use

Organic coatings on precoated sheet are subjected to stresses when fabricated into products by roll forming, brake bending, or other deformation processes. These stresses can exceed the flexibility or adhesive strength of the coating, resulting in fracture of the coating which exposes the substrate, or in the loss of adhesion of the coating to the substrate. This test is a means of evaluating the ability of a coating system to withstand the stresses of fabrication.

The bend direction, whether the axis of bend is transverse to or along the rolling direction of the metal, and the temperature of the specimen when it is bent can affect the results of this test and should be agreed upon between the supplier and the user.

1. Scope

1.1 This test method describes a procedure for determining the flexibility and adhesion of organic coatings (paints) on metallic substrates that are deformed by bending when the sheet is fabricated into building panels or other products.

1.2 The metal substrate must be capable of passing this test without fracturing and with no excessive grain development.

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 and health practices and determine the applicability of regulatory limitations prior to use.


Keywords

coating flexibility; prepainted sheet; T-bend flexibility; Prepainted steel sheet; Sheet metal; Deformation--paints/related coatings/materials; Adhesion--paints/related coatings/materials; Flexibility; Metallic coatings; Organic coatings ;


ICS Code

ICS Number Code 87.040 (Paints and varnishes)


DOI: 10.1520/D4145-10

ASTM International is a member of CrossRef.

ASTM D4145



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About ASTM

ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.
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