ASTM D 522 :
Standard Test Methods for Mandrel Bend Test of
Attached Organic Coatings |
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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.
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