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Looking for high emssivity at 400deg.c materials

Looking for high emssivity at 400deg.c materials

Looking for high emssivity at 400deg.c materials

(OP)
Want to use it as a target cover for IR detector emissivity calibration of metals at the same temp.
Can be paint or tapes,
thank you

RE: Looking for high emssivity at 400deg.c materials

There are paints available that should get to that temperature.  I have used some on the fireside of industrial boiler waterwalls.  Steam temperatures were probably about 270C inside the tubes.  Furnace temperatures were, of course, a lot hotter.  Surface temperatures were probably about 300-320C.  

Jack M. Kleinfeld, P.E.  Kleinfeld Technical Services, Inc.
Infrared Thermography, Finite Element Analysis, Process Engineering
www.KleinfeldTechnical.com

RE: Looking for high emssivity at 400deg.c materials

(OP)
thank you
 I am looking for any specific material with a known E values

RE: Looking for high emssivity at 400deg.c materials

The material I used had a high emissivity.  If I remember correctly, it was about .9 to .95.  It has been about 7 years since I did it, so I don't remember it distinctly.  It would take me a couple of hours to dig up the information about its source.  Alternatively, you could do a net search for high temperature coatings/paints. Let me know if it something you want me to do.

Jack M. Kleinfeld, P.E.  Kleinfeld Technical Services, Inc.
Infrared Thermography, Finite Element Analysis, Process Engineering
www.KleinfeldTechnical.com

RE: Looking for high emssivity at 400deg.c materials

(OP)
I am searching the net, can find only general info

RE: Looking for high emssivity at 400deg.c materials

There are a some of possibilities:

> "Black" gold, which is a coating used primarily in LWIR to reduce reflectivity.  It's essentially a non-dense deposition that counts on tortuous-path absorption.

>  Physical means, A surface coated with black gold or even possibly a roughend anodized aluminum with cavities.  The cavities would be pyramidal with perhaps a 4 or 5 to 1 aspect ratio.

>  Some sort of "carbon black" or soot coating.

>  EOI has a proprietary coating that's used in some of their blackbodies (look for "EOI Mid temperature"):
http://www.electro-optical.com/bb_rad/emissivity/matlemisivty.htm

TTFN

RE: Looking for high emssivity at 400deg.c materials

(OP)
Thanks again
I have "been there", no info where to purchas the paints, are they std.?
KIKRON CO. has a special test paint with E of .99
snopy

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