How to Judge the Quality of China Polished Aluminum Mirror Sheet

In spite of diverse names of china polished aluminum mirror sheets, the methods to judge their quality are relatively uniform. Generally speaking, one can roughly decide whether a piece of reflective aluminium sheet is worthy buying or not by the following steps.
china polished aluminum mirror sheet
A buyer of china polished aluminum mirror sheets can first touch the surface of a sheet after tearing off its protective layer. This method proves to be especially effective when his hands are wet with sweat, for a sweaty hand will leave clear fingerprints on the sheet surface. With excellent mirror sheets, the fingerprints can be erased effortlessly with a piece of dry cloth a paper, and no trace of touching is left. In contrast, fingerprints on the surface of inferior sheets will become blurred and widened, leaving a large dull stretch which has no reflective effect at all. Fingerprint is the simplest testing way. A second method to test the quality of china polished aluminum mirror sheet is to scratch slightly on the surface of a sheet with a knife and check whether there are scratches left. If not, you can be assured that the sheet is of premium quality. Another method involves bending a small piece of sheet swiftly at your ear, and if a gentle tearing sound is heard, the sheet is proved to be of top quality. Otherwise it’s only an ordinary polishing sheet. The explanation for this is that good china polished aluminum mirror sheets are usually covered with a layer of corundum-like oxide film. Owing to difference from aluminum sheet in structure, the oxide film will burst and give a slight tearing noise while being bent. Further more, superior sheets will have no cracks even after being bending.
As one of the largest aluminum alloy manufacturer in China, Haomei supplies polished aluminum mirror sheets of all common specifications. Welcome to contact us at alu@aluminio.cn for more information!
Reprinted from http://www.aluminio.cn/how-to-judge-the-quality-of-china-polished-aluminum-mirror-sheet/

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