How to Choose the Right Black

Our black products are mainly used in industrial applications to prevent unwanted stray light reflections. Our products are available in various material types such as polyurethane sponge, flock sheet, and water-based acrylic paint. We will introduce the features of each type so you can choose the right black to best suit your needs.

Classification by Material

Currently, we offer 3 different materials for anti-reflection treatment: Our polyurethane sponge "Fineshut" series, our flock sheet series, and our "Musou Black" water-based acrylic paint.

 

The main uses for our products include:

  • Fineshut - internal parts of optical equipment.
  • Flock sheets - auxiliary materials such as black backdrops for photography.
  • Musou Black - temporary anti-reflective treatment for prototype development.
Material Polyurethane Sponge Flock sheet Paint
Product

Fineshut SP

Fineshut KIWAMI

VL Flock sheet

IR Flock sheet

Musou Black
Features Strong light absorption performance in both visible light and infrared light ranges. Our most durable product that does not easily produce dust, and therefore ideal to be used as an internal material in optical equipment. More affordable than our Fineshut series while still offering very high light absorption performance. However, be wary of the risk of dust generation due to fiber-hair loss. Excellent visible-light absorption performance; however, the coating is very fragile and prone to produce dust when handled.   
Applications  Internal components of optical equipment. Such as cameras and lenses.  Blackout curtains and backdrops for photography and videography. Temporary anti-reflection treatment. Hobby use.

Total-Reflectance Rate Comparison

Product name

UV

250nm

VL

500nm

N-IR

950nm

N-IR

1500nm

Fineshut SP 1.7% 1.2% 1.2%  1.4%
Fineshut KIWAMI 0.8% 0.7% 0.7% 0.7%
VL Flock Sheet 0.5% 0.3% 10.0% 43.7%
IR Flock Sheet 0.3% 0.3% 0.3% 0.5%
Musou Black (Air-brush) 0.8% 0.6% 2.0% 10.7%
Musou Black (Brush) 1.3% 1.0% 3.5% 17.6%
Visible
Visible

We compare the total reflectance values of our materials based on the AOI 8° index. Total reflectance is the measurement result of combining both diffuse reflection and specular reflection measurements. AOI 8° means that the light is incident at an angle of 8° from the normal.

 

Based on this index, our "Fineshut" series stably absorbs light from the ultraviolet to the near-infrared light range. This performance is achieved by the uneven structure derived from the foaming process and the composition of carbon atoms blended into the resin.

 

We also offer two types of Flock Sheets. Our "VL Flock Sheet" is inexpensive and provides strong anti-reflection performance in the visible light range. In contrast, our IR Flock Sheet provides improved ultraviolet and excellent near-infrared anti-reflection performance, which are the weak points of the VL Flock Sheet.

  

Musou Black's anti-reflection performance will vary depending on the painting method, so please keep that in mind when applying. For the best result, apply Musou Black with an airbrush. 

Size and Handling

Product

Max size

Thickness

(mm)

Touch

durability

Fineshut SP

1000mm

x 120m

0.22

or 0.40

Durable
Fineshut KIWAMI

480mm

x 280mm

0.37 Semi-durable
VL Flock sheet

950mm

x 20m

0.9 Durable
IR Flock sheet

950mm

x 50m

0.8 Durable
 Musou Black - 0.05  Fragile 

This chart explains the maximum size dimensions and handling durability of each material. Because our Fineshut SP is roll-to-roll molded at a width of 1000mm, it can be supplied in a maximum width of 1000mm. *Please allow up to 2 months lead time for 1000mm width orders.

 

The maximum dimensions we can provide for our Fineshut KIWAMI is 480mm x 280mm per sheet because it is manufactured one sheet at a time. Since the light-absorbing layer tear easily, Fineshut KIWAMI is always outfitted with double-sided tape to ensure durability.

 

The anti-reflective performance of our Fineshut and Flocksheet products do not degrade upon slight contact. However, Musou Black's coating is very delicate and can easily be damaged, resulting in performance degradation. Please be aware that the damaged coating is prone to generate particle dust.

About the Double-sided Tape

Name

Thickness

(mm)

Features
DIC 8103D Black 0.15 Non-woven fabric-based material. Flexible and highly adaptable to curved surfaces. It leaves minimal adhesive residue within a short amount of time, therefore making it easy for re-application. It can be used for a wide range of applications.
 DIC #8616UJ Black-50(N) 0.05 PET-based material. When making small-sized parts, if the adhesive tape is too thick, the side profile of the adhesive tape layer may result in unwanted reflections. In such cases, this thinner tape is recommended. *Please note that the release film can be a little tricky to peel off.

The above chart lists the two double-sided adhesive tapes that we use. Both are black, have strong-adhesive properties, and are double-sided with excellent light obstructing properties. In addition to the two types of tape listed here, we can also laminate other types of tape upon request.

About Laser-Cut Prototypes


We offer laser-cutting services for small lots and quick delivery to support prototyping. Shipment is possible on the same day at the earliest.

 

To get a rough estimate of the processing cost, please download the Excel file below, choose the material and input the part's external dimensions in the red frame. 

 

*Please note that the cost will vary depending on the shape of the part, so we will only be able to give you an official estimate after receiving your designs.

Download
Laser-cut Calculation Sheet v20210209 (E
Microsoft Excel Table 17.3 KB

*Please note that a slight amount of soot may adhere to the edge's surface as a side-effect of the laser-cutting process.

 

In addition, we can combine laser cutting and laminating operations to produce anti-reflective QR code markers, so please feel free to contact us at ko-pro@outlook.com.