Diffuse Black Coatings and Materials

Technical questions about these products?
Contact Art Springsteen: Email or (603)526-2420


Do you need a quotation for these products?
Contact Kathy Springsteen: Email or (603)526-2420

 

Avian Black-S Coating

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

Wavelength

Reflectance

 

Wavelength

Reflectance

 

Wavelength

Reflectance

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 1-2 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

 

 

Avian-DS Black

Avian-DS black is an etch-anodize process similar to what was known as Martin Black. Avian-DS, however, is even more absorbent of light. It is the blackest material we've seen in almost twenty years in this field. Coating is limited to parts fabricated from aluminum. This is a batch process, so small lots tend to be very expensive but the coating is economical for large lots or OEM quantities. This coating can only be applied to aluminum substrates.

We are working to extend the range of Avian-DS Black further into the NIR. The data shown is for our most recent iteration of the process. Please call us for pricing on Avian-DS Black.

Avian-DS Black
Typical 8°/Hemispherical Reflectance Data

Wavelength

Reflectance

 

Wavelength

Reflectance

 

Wavelength

Reflectance

250 .009   800 .006   1600 .223
300 .007   900 .008   1800 .305
400 .008   1000 .011   2000 .335
500 .006   1100 .020   2200 .355
600 .006   1200 .043   2400 .354
700 .006   1400 .123   2500 .328

graph

 

With Avian Black-S, Sometimes More Is Less

We have always suggested that an optimum thickness for spraying Avian Black-S is approximately 3 mils (3 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 customerís 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.

graph