Re: black paint - light absorption?

Does it have to be paint? Would soot deposited from a candle flame work?

Your requirements are similar to those NASA has faced for space based optics including baffels.

Have you gotten ahold of the NASA documentation on recommended types of optical black coatings?

Why reinvent the wheel? Especially if you are headed for a smilar application.

Years ago, I had that stuff in my files, but it should be easier to get these days over the net and by telephone calls.

Jim

Well, the company I mentioned does job for NASA. MH2200 is THE stuff, but too expensive for me to buy $600 a gallon paint with a shelf life of 6 months..

So, to make a long story short,,,,,,

You haven't looked into what NASA has studied !

You just want something black and cheap,,,,, and oh yes, probably to be used on spacecraft of some type?

The NASA optical black and optical coatings data contained more than one material.

All we see from you is one material.

Jim

(1) "The selection of infrared blacks for SIRTF" by St. Claire Dinger, SPIE, Vol. 2260, Stray Radiation in Optical Systems III (1994). (2) "Infrared black paints for room and cryogenic temperatures" by Ungar, Mangin, Lutz, Jeandel & Wyncke, SPIE, Vol 1157, IR Technology XV (1989).

Jan 9, 2004

I think that the best black coating is ZYNOLYTE a paint for Hi-Temp (1200ºFº) the original purpose was to paint stoves or similar, but now is used for all manufacturer of black-bodys, for NASA, Sandia Labs etc. The coeficient is 0,99 and works perfectly in IR, Distributor is Athena Brands Inc Gardnerville Nevada

E. Diez Valero

- Madrid, SPAIN

sounds like a pretty good idea.

Candle soot or butane soot is very very black.. blacker than any paint i've seen. A butane lighter lit with an oxygen starved atmosphere soots all over. Pure(er) butane shouldn't be hard to find.

And can't beat the price!

-Scott

Carbon black is a very good broadband absorber of UV, VIS and IR radiation. It's also difficult to work with as it adsorbs a host of environmental materials, thereby changing its reflectivity and it's flammable. If you have a specific need for UV absorption, going by the visible appearance of material can be deceiving. Rare earth oxides, specifically praseodymium oxide is an exotic, but effective broadband absorber that can also handle high temperatures. I have a patent on selective spectral absorption (see US Patent 6,465,799) you may want to look at. It contains data for various compounds that selectively absorb or reflect radiation. Hope this is helpful.

- Allan

If you are wanting to apply a black (very black) coating onto a "metal" surface, would electroplating "black nickel" work? It has a fairly high emissivity rating, works under extremely high temps, etc....

obirer wrote: