Black Polyimide Masking Tapes
Black polyimide masking tapes manufactured by OPALUS PACK are made for electronic assemblies that need both high-temperature masking and optical control. Built with black PI film tape and silicone adhesive, they provide opaque masking, light blocking, and optical shielding for camera modules, sensors, LED areas, and display edges. In controlled LED directional checks, matte black samples showed a low relative glare level of about 10-15% compared with glossy reference surfaces. Adhesion remained stable after repeated heat exposure, depending on substrate and process conditions.
- Material: Black polyimide film with silicone adhesive
- Color: Matte black or glossy black
- Typical Thickness: 50 um, 60 um, 80 um, 100 um
- Width Options: 3 mm to 500 mm slit width
- Temperature Range: -73C to 260C, short peak up to 280C
- Format: Rolls, sheets, strips, frames, dots, and die-cut parts
Product Overview
Black color is not only an appearance feature. The black polyimide film helps reduce unwanted light paths inside compact devices, especially around lens frames, sensor borders, LED windows, and display edges. Standard amber PI tape can handle heat, but it does not solve the same light leakage problem.
This opaque polyimide tape is designed for places where covering, absorbing, or separating light matters. It can be used before reflow soldering as a temporary mask, or converted into die-cut parts for internal shielding. The silicone adhesive is selected for high-temperature masking, but residue should still be checked on the final surface because FR4, stainless steel, aluminum, glass, PC, PET, and coated parts behave differently after heat.
In internal observation, samples on FR4 and stainless steel held edges after 5-10 simulated reflow cycles up to 260C. No heavy adhesive transfer was observed under normal peel removal. For optical use, thinner tape fits tight gaps, while thicker tape gives stronger handling stability and better covering ability.
Benefits
- Helps control light leakage in camera, sensor, LED, and display assemblies
- Uses black PI film tape for opaque masking instead of standard amber film
- Offers matte black for lower reflection or glossy black for inspection contrast
- Maintains dimensional stability during high-temperature masking processes
- Can be converted into strips, rings, windows, dots, or frame-shaped parts
- Supports color consistency checks for visible internal parts and optical modules
Where Can Black Polyimide Masking Tapes Control Light Leakage?
Light leakage is often found at small edges rather than large open surfaces. In camera modules, black polyimide masking tapes can be placed around lens holders, sensor borders, and internal housing walls to reduce stray light paths. In LED and display assemblies, the tape can cover backlight edges, indicator gaps, and dark internal zones where brightness uniformity matters.
For sensor areas, the tape works as an optical shielding tape when a light-sensitive part sits close to another light source. The goal is not only to make the part look black, but to limit unwanted reflection and edge glow inside the final device.
TDS
| Item | Typical Value |
|---|---|
| Base Film | Black polyimide film |
| Adhesive Type | Silicone pressure-sensitive adhesive |
| Surface Option | Matte black or glossy black |
| Film Thickness | 25 um to 125 um |
| Total Thickness | 50 um to 160 um |
| Standard Width Range | 3 mm to 500 mm |
| Die-Cut Shape | Strip, dot, frame, ring, window, custom outline |
| Die-Cut Tolerance | +/-0.10 mm to +/-0.20 mm, depends on design |
| Temperature Resistance | -73C to 260C |
| Short-Term Heat Exposure | Up to 280C |
| Adhesion to Steel | 2.5 N/25mm to 4.0 N/25mm |
| Light Blocking Check | High opacity, depends on thickness and test wavelength |
| Residue Observation | Substrate and heat-cycle dependent |
Applications
- Camera module masking around lens frames and sensor edges
- Optical sensor shielding where stray light may affect signal accuracy
- LED indicator light blocking and backlight edge masking
- Display module dark covering for bezel and frame areas
- High-temperature masking during electronic assembly and reflow processes
- Die-cut black PI parts for compact consumer electronics
How Should You Select Matte or Glossy Surface?
Matte black polyimide tape is usually better near cameras, optical sensors, and display edges because it reduces glare under angled light. In LED directional checks, matte surfaces show lower highlight reflection at 30-45 degree viewing angles, helping reduce stray-light interference inside small housings.
Glossy black film serves a different purpose. It can be easier to inspect visually and may give better contrast on automated assembly lines. For a light blocking polyimide tape close to a lens or sensor, matte is normally safer. For visible internal covering or inspection contrast, glossy may be more practical.
FAQ
Is this the same as amber polyimide tape?
No. It uses black polyimide film for opaque masking and light blocking, while amber PI tape is mainly for general heat masking.
Can black polyimide masking tapes completely block light?
They provide high opacity, but results depend on thickness, surface finish, wavelength, and assembly structure.
Will the adhesive leave residue after high-temperature use?
Residue depends on substrate, dwell time, heat cycle, and removal temperature.
Can it be supplied as die-cut optical shielding parts?
Yes. It can be converted into strips, rings, dots, frames, window shapes, and other precision parts.