Black Coating Services

Acktar is a world leader in high absorptance & high emissivity black coatings for stray light suppression in high performance optics. The combination of a very low reflectance, high thermal stability, excellent adhesion, and low outgassing in a coating that is only a few microns thick is very unique.

Acktar black coatings are suitable for essentially all engineering materials – metals and alloys, polymers, silicon, glass, and ceramics.

We offer six types of coatings, each designed for a specific wavelength or application, as well as tailored coatings to our client’s specific needs.

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Discover the technology

Acktar’s proprietary sophisticated vacuum deposition (vacuum coating) technology generates coatings with an extremely high specific surface area. Discover the unique characteristics of our vacuum coating technology


Question: How do Acktar’s black coatings compare with typical paints?

Answer: Acktar’s black coatings are manufactured using vacuum deposition technology. They are very thin, completely inorganic, have very low outgassing and low reflectivity. See our video here.

The below table provides a detailed comparison of Acktar’s black coatings with typical paints.

Comparison table

Characteristic Paint – typical Acktar
Density 1.1 gr/cm3 1.8 gr/cm3
Thickness µm-100µm 60 10 ~ µm
Coating weight 10.8 mg/cm2 dry 0.9 mg/cm2
Reflectance (0.8-12µm) < 10% < 4%
Outgassing- CVCM < 0.1% 0,001%
Outgassing – RML < 1% 0.3%
Bonding to coating problematic excellent
Edges build-up on edges/corners not build up
Drying period 7 days none
Temperature range 96K-473K 4K-623K (720K for short periods)
Particulate contamination particulates not particulates
Organic contamination (silicones, polymers, etc.) high none
Coating thickness control poor good
Thickness tolerance ±20µm ±1.5µm
Coating adhesion limited excellent
Resistance to atomic oxygen limited excellent
Electrical conductivity typically non-conductive tailorable conductivity


Question: What is the typical thickness of Acktar’s coatings?

Answer: Acktar coatings are typically between 3-14 µm thick, but can be tailored to between 1-30µm upon request.

Question: What makes Acktar’s coatings the best choice for IR detectors and Space applications?

Answer: No Particulation, broad working temperature range, low outgassing, thin coating with tight tolerances, low reflectivity over a wide wavelength range, high emissivity, completely inorganic, can be applied on essentially any substrate, perfect cover (no build-up) on edges.

Question: Can you coat selected areas on the part?

Answer: Yes. We use mechanical masking that is tailored to the requirements.

Question: What would be considered as a typical applications for the coatings?

Answer: The most common applications are: stray light absorption in UV-VIS-IR wavelengths, night vision systems, cooled IR detector parts, satellite parts, high surface area capacitor electrodes, LED screens and more.

Question: What Quality standards do you comply with?

Answer: Acktar is certified as a production and development facility by ISO 9001:2000, IQNet, S.A.M.S, RoHs and REACH. In addition we are certified as a “Ship to Stock” supplier for one of the world’s largest manufacturers of IR detectors – based on our quality and strict inspection regime. See the full list of certificates.

Question: How can I coat large area parts / surfaces?

Answer: Acktar’s coatings are available in two options:

    1. Direct Coating (current page) – where you send the part to us and we coat to your specifications.
    2. Foils and Films – Black coated foils and films with or without adhesive that can coat large areas.

Question: What is the thickness tolerance of your coatings?

Answer: The thickness tolerance of our coatings can be as tight as 1-2 µm.

Question: What is the quality of the coating on the edges?

Answer: Our coatings have excellent coverage over the entire part including the ability to confirm to edges as seen in the below photo. There is no need for special design of the edge to attain the perfect coverage.

black coating label applied to edges

Question: How do Acktar Black coatings perform in extremely low temperatures?

Answer: Acktar’s Fractal BlackTM was tested by an independent laboratory to compare its performance at very low temperatures with that of thick epoxy layers and black paint.

The summary of the report is as follows: “The main advantage of Fractal BlackTM for us is the relatively high blackness at low temperatures (10K-50K) of the source of the thermal radiation achieved by small thickness of the coating.”

A full copy of the report is available upon request.

Question: Most of your products have very high emissivity. Can you produce a coating which is black in the visible range, but has low emissivity in IR?

Answer: Yes, our Nano Black selective coating has high absorbance in the VIS range and low emissivity in the IR range.

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