Mandrel Bend Test of Attached Organic Coatings ASTM D522

Mandrel Bend Test of Attached Organic Coatings ASTM D522

ASTM D522 is a set of two test methods A and B that are used to determine the elongation or resistance to cracking of attached organic coatings on substrates. Methods A and B deal with coated panels bent over a conical mandrel and cylindrical mandrel respectively

    Scope:

    ASTM D522 test contains two test methods that determine the elongation or resistance to cracking of attached organic coatings on substrates. The substrate can be cold-rolled steel strip, sheet metal, or rubber-type materials. 

    Test Procedure:

    For ASTM D522 test, the coatings materials are applied at a constant thickness to panels of steel strip or sheet metal, or rubber-type materials. There are two methods included: Method A and Method B. These test methods are applicable in rating attached coatings for their capacity to withstand cracking when elongated and also useful in determining the flexibility of coatings on flexible substrates. 

    After the process of curing or drying, the coated panels are bent over a mandrel and the elongation or resistance to cracking of the coating is evaluated. The coated panels are bent over a conical mandrel in Test Method A whereas the coated panels are bent over cylindrical mandrels of various diameters in Test Method B. 

    Sample size:

    The number of samples per product in test method A is 3 and in the test method B is 2. The substrate thickness for coating elongation rating is a cold-rolled steel strip of 0.8 mm (1/32 inches) thick and for rating coated material is sheet metal of less than 0.8 mm (1/32 inches) or rubber-type materials is less than 13 mm (½ inches). The dimensions of the samples are 46 inches. 

    Data:

    Mean and range of coating elongation or resistance 

    Mean and range of coating film thickness 

    Total elongation formula

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