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The need: Your assembly is leaking light and you need a blackout tape sourced with a figure you can inspect against. Here is what to specify and what to ask for.
“100% opaque” is a marketing phrase, not an acceptance criterion. Ask for the measured quantity — optical density or transmittance — with the method and the wavelength range it was measured over, and state the inspection condition you will judge the part by.
Most optical leaks are not a material problem but a geometry problem: the leak is at a corner, a cut edge or an overlap. So the die-cut drawing, the tolerance and the cut-edge quality usually decide the outcome more than the backing does.
Send the drawing, the inspection condition and the substrate and EJOY proposes a construction and ships samples for your own inspection. Backing and coating detail is published by the manufacturer.
Viewing distance, ambient light level and the inspection method you will use. Without it, “no leak” is unmeasurable.
Including the wavelength range. A bare “100% opaque” claim cannot be verified — ours included.
Corners, cut edges and overlaps are where light gets through. Include the liner and tab format.
A matte face matters when the tape sits inside an optical path; say which side faces the light.
As a measured figure — optical density or transmittance — with its method and wavelength range, plus the inspection condition the part will be judged by. Treat any bare “100% opaque” claim as unverified, including ours until we give you the figure.
A 2D drawing with tolerances, the substrate, the liner and tab format, the inspection condition and the annual volume. Cut-edge quality usually decides whether the part passes.
Because that is where the geometry breaks — radius, overlap and cut quality. It is normally fixed in the die-cut drawing rather than by changing the backing.
If the tape sits inside an optical path, yes. Say which face sees the light so the reflectance requirement is quoted rather than assumed.
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