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| Cupping tester ： ウィキペディア英語版 |
Cupping tester
Cupping testers are employed in the testing of the elongation and deformability of lacquers and protective coatings applied to metal substrates. This sort of test is essential because it allows one to test the durability of a lacquer or protective coating before the coating is applied to a product.
==Operation==
The cupping tester operates by using a punch to push upon the unpainted side of a coated panel until the painted side shows signs of deformation (cracks) in the coating. It is when cracks start to appear that the lacquer or coating's durability can be recorded, this durability is known as the coating's flexibility rating.〔Koleske, Paint and Coating Testing Manual, p. 551, ISBN 0-8031-2060-5〕
The test can also be performed according to a predetermined depth. For example, if a coating needed a certain flexibility rating, then the tester would be set to a depth in accordance with that rating, without the need to deform the coating until it fails.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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