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Objective Method to Grade Reflectivity of Aluminum Alloys


We are trying to find an objective method to grade reflectivity of aluminum alloys in our extrusion plant.

If anyone knows of a piece of test equipment that will allow us to check reflectivity in a production (not laboratory) setting, please contact me.


Howard R. Stewart
Mid-States Aluminum Corp. - Fond Du Lac, Wisconsin, USA


I know of one plating company which measured the reflectivity of cold rolled sheet. It was done with flat rolled samples approximately 12" x 12". Not a lab, but an office near the plating line. The dirtier or smuttier the sheet, the more difficult it was to electro plate. A small instrument was used. It was merely a light, which could measure its own reflectivity. Good reflectivity = clean surface. Less reflective = dirtier surface. They had to develop their own scale of suitable reflectivity.

Unfortunately, I don't remember the name of the company which manufactured the light.The plating company was a major steel company in Cleveland, OH.

Good Luck,

Terry Magyar
Berwick Steel Co. - Columbus, Ohio, USA

Gloss Meter from UK may be of use in differentiating the gloss thereby idea on reflectivity, but is offline & not online. Instrument is portable type & can be used anywhere.

Shankar Nayak
- Mumbai, India
April 12, 2008

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