ASTM D 522

ASTM D 522 : Standard Test Methods for Mandrel Bend Test of Attached Organic Coatings These test methods cover the determination of the resistance to cracking (flexibility) of attached organic coatings on substrates of sheet metal or rubber-type materials. Coating on .036 inch thick phosphated steel panel shall withstand 180 degree bend over 1/4" mandrel. No crazing or loss of adhesion and finish at the bend be able to be removed with 3M Y-9239 tape.