Fractal Black coating | stray light suppression | Acktar Optical black coating

Fractal Black Coating

metallic component coated with Fractal Black coating
complex component accurately coated with fractal black coating
3 circular metallic components coated with fractal black coating from the inside
big golden component coated with Acktar’s fractal black coating
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metallic component partly coated with fractal black coating
several metallic components partly coated with fractal black coating
lots of tiny gold components coated with fractal black coating
Main structure tzaruv

Fractal BlackTM is the coating of choice where low reflectance / high emissivity is required across the spectrum from the UV through LWlR — typically for stray light suppression.

In addition to its superior optical performance Fractal BlackTM delivers many other attributes important in space applications

  • Essentially zero outgassing
  • Vacuum and thermal—vacuum cycling qualified
  • Operating temperatures from (-)269°C to (+)350°C
  • No particulation
  • Only a few microns thick
  • Compatible with virtually all substrate materials
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High Adhesion
Space Qualified
Low Reflection
Low Thickness
Thickness 5-14µm
Temperature stability
Light Weight
REACH ROHS Compliant
Low Outgassing
Completely Inorganic

Specifications

Adhesion
metals, glass, ceramics, polymers
Adhesion test (ref ECSS-Q-ST-70-13C)
Coated pieces withstand scotch tape test (3M853 Crystal Clear tape, strength of 13N per 25mm), without any evidence of coating removal.
Outgassing CVCM (%)
0.001
Outgassing RML (%)
0.2
Coating chemical content
completely inorganic
Surface resistivity
≤2X10^6Ω/□
Material
metal
Cleanability
"Coated pieces withstand cleaning with ethanol, IPA or acetone with no change in optical and technical characteristics. Magic Black™, Metal Velvet™ and Litho Black™ should be cleaned very gently."
Parts shape
3D
Humidity Resistance
MIL-C- 48497A
Certificates
ROHS, REACH, ISO 9001:2015, AS9100

Typical Properties

Fractal black coating reflectance chart

Operational wavelengths
VIS-FIR
Coating thickness
5-14µm
Emissivity 3-10µm
> 97
Emissivity 3-30µm
> 88
Working temperature (°C)
-269 to 380
Working temperature (°K)
4 to 653
Weight of coating (mg/cm²)
1.6 - 3.2
moderate Abrasion resistance
(ref MIL-C-48497A)

Additional Details

Fractal BlackTM has been extensively tested and qualified for space applications and is applied in a variety of space programs including among others:

  • ESA/ NASA James Webb Space Telescope (JWST) – NIRSpec
  • ESA Bepi Colombo
  • Meteosat Third Generation (MTG) satellites
  • EnMAP-FSSA satellite

Fractal BlackTM was thoroughly tested and qualified for thermal cycling, thermal vacuum cycling, cryogenic temperature performance, outgassing, space atomic oxygen, reflectance after environmental exposure, adherence. Detailed BRDF data is available for VIS. SWIR, MWIR and LWIR.

Detailed BRDF data is available.

Large Order? We Can Help.

For a personal consultation with one of our experts please leave your details below and we will get back to you as soon as possible. Together we will determine your exact needs in terms of coating type, quantities, sizing and special product characteristics etc. Once all is clear we will be more than happy to submit a customized offer with excellent competitive prices.

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