Lambertian BlackTM Foil


  • Essentially zero outgassing
  • Vacuum and thermal-vacuum cycling compatible
  • No particulation
  • Only a few microns thick
  • Virtually adheres to all substrate materials
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Welcome to the Lambertian BlackTM Foil webpage! Our product is the ideal coating for those who require a matt surface with the lowest reflectance in the UV, VIS, and IR regions. With its completely inorganic coating, zero outgassing, and vacuum compatibility, our product offers superior optical performance at all angles of incidence, high abrasion resistance, and easy cleanability. Our webpage provides detailed specifications and typical properties of the Lambertian BlackTM Foil, along with additional details such as sample images and related products.

Substrate material
Stainless steel
Adhesion test (ref ECSS-Q-ST-13C)
Coated pieces withstand the Scotch tape test (3M853 Crystal Clear tape, strength of 13N per 25mm), without any evidence of coating removal.
Outgassing CVCM (%)
Outgassing RML (%)
Coating chemical content
completely inorganic
Surface resistivity
≤2X10^3 Ω/□
"Coated pieces withstand cleaning with ethanol, IPA or acetone with no change in optical and technical characteristics." Can be cleaned using clean cloth wiped with above mentioned solution.
Parts shape
Flat or simple 3D shape
Humidity Resistance
MIL-C- 48497A
ROHS, REACH, ISO 9001:2015, AS9100
Typical Properties

Lambertian Black

Lambertian BlackTM is the coating of choice where an ideal matt surface is required, with the lowest reflectance in the UV, VIS, and IR regions and high absorptance at grazing angles.

In addition to its superior optical performance, Lambertian BlackTM delivers high abrasion resistance and can be easily cleaned using a clean cloth wiped with a solvent.

Like other Acktar coatings, this is a completely inorganic coating with many advantages such as zero outgassing, vacuum compatibility, and UV stability.

Detailed BRDF data is available.

Operational wavelengths
Substrate thickness
Coating Thickness
3-10µm: >98
3-30µm: >88
Working temperature (°C)
-269 to 380
Working temperature (°K)
4 to 653
Weight of coating
0.7 - 1.1 (mg/cm²)
Light Abrasion resistance
Moderate plus
Additional Details

Sample image under grazing-light illumination – Lambertian BlackTM (left) vs diffuse black surface (right):

Lambertian Black under grazing light Diffusive surface under grazing light

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