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Letter 5029
Emissivity of coatings
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I'm trying to track down emissivity data for some finishes. My
most urgent need is to find the emissivity for chromate finish
aluminum MIL-C-5541 class 1A. Does anybody know it? Does anyone know
a good reference for properties of other coatings ?
Peter Kostka
- Madison, WI, USA
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Peter, Here is a procedure to determine the emisstivity of any
substrate... You will need an infrared temperature gun that has
adjustable emissivity and a touch type temperature sensor.
Take a chromated piece and check the temperature with both the
touch gage and the IR gage. Adjust the emissivity on the IR gage
until the temperature reads the same as the touch gage.
When the same temperature is reached, make note of the emissivity.
This procedure assumes that the touch gage is correct. Hope this
helps. Kelly
Kelly Draper
Systems & Electronics Inc. - West Plains, Mo
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