Avian Black-S


Avian Black-S coating is a spray on, two part water based urethane coating that exhibits low reflectance over a wide wavelength range. The water-borne coating exhibits very low gloss and is quite durable compared to most low reflectance coatings. It is easily mixed and may be applied with standard spraying equipment. Cleanup is easily done with water and detergent.

The coating passes and exceeds Mil spec for live agents and durability. It is a low VOC coating (<1.8 lbs/gallon) and is non-flammable as applied.

The reflectance is <3.5% over most of the UV-Vis-NIR and appx. 3% over most of the range. See below for notes on how to push this reflectance even lower.

Avian Black-S
Typical 8°/Hemispherical Reflectance Data

250 .040 800 .032 1600 .031
300 .034 900 .030 1800 .033
400 .032 1000 .029 2000 .035
500 .031 1100 .029 2200 .037
600 .031 1200 .029 2400 .038
700 .032 1400 .030 2500 .040


Physical Properties:

  • Gloss: 1%< @ 60°, <3.5% @ 85° Flexibility: Pass 1/8″ Mandrel 180° bend
  • Viscosity: 70-75 KU Pot Life: 4 hours
  • Coverage: a coverage calculator is available upon request
  • Air Quality: <1.8 lbs/gallon V.O.C.
  • Weathering: QUV >1000 hrs. Xenon Weatherometer >2000 hrs. no change
  • Chemical Resistance: Water >168 hrs. immersion
  • Hydrocarbon TT-S-735 Type III: <168 hrs. immersion
  • 10% Acetic Acid: 1 hour spot


The coating may be applied over most primers. Typically a 3-4 mils thickness gives full opacity.

Avian Black-S is available as a kit that makes appx. 1.5 liters of coating. Please call for larger quantity prices.

Part # Description
Avian-BKS-QT 1.5 Quart Avian-Black S Coating


Technical resources:

With Avian Black-S, Sometimes More Is Less

We have always suggested that an optimum thickness for spraying Avian Black-S is approximately 4 mils (3-4 coats) thick. And indeed, at that thickness, one can get a very matte coating of about 3% reflectance over a very wide wavelength range, as shown by the reflectance plot on our website.
Recently, however, we had a customer come to us and say that we were being very conservative with that 3% R that we quote. The customer said that they were able to decrease the reflectance to around 2%R by adding more coats, and even less if one sprayed from a longer distance to get a rougher texture. As this coating is really loaded with binder, even something that appears to be overspray has very good adhesion properties.
So we tried to replicate the customer’s results and discovered they were correct! With seven coats (7 mils), we were able to drop the coating reflectance to about 2.1-2.2%R in the NIR (2.5% in the visible). And when we sprayed from a distance of approximately 15 inches, the reflectance dropped to 2% in the visible and around 1.9%R in the NIR.
So, if you need really low reflectance in a spray on coating and you can live with a slightly thicker coating build, this is the way to go. Give us a call and we will share with you how we do it.


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