Looking for high emssivity at 400deg.c materials

[snopy]

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

 

[JKEngineer]

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

http://www.KleinfeldTechnical.com

 

[snopy]

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

 

[JKEngineer]

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

http://www.KleinfeldTechnical.com

 

[snopy]

I am searching the net, can find only general info

 

[IRstuff]

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&quot:

http://www.electro-optical.com/bb_rad/emissivity/matlemisivty.htm

TTFN

 

[snopy]

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