EmiClare mesh has been optimized to provide exceptional optical performance without sacrificing EMI shielding. The data detailed below is actual transmission of the total window and avoids the confusion caused by quoting the calculated mesh open area as the transmission of the finished window.

The light transmission of an EMI shielded window is determined by the following factors:

Mesh Transmittance

EmiClare mesh provides brighter image quality through higher mesh transmittance.


The following chart gives a guide of the light transmittance (T%) of the common substrates.

Plain "float" glass 90-92%
Clear polycarbonate* 85-90%
Clear acrylic* 85-90%
Clear polyester* 83-88%

* Varies with thickness due to internal dispersion and may also vary between suppliers.

Surface Finish

The following table quantifies the effect of the common surface finishes on optical transmittance.

Surface Finish Reduction in T%
Non Glare coatings 60-70 gloss 2-3%
Non Glare coatings 80-90 gloss 1%
Clear hard coats <1%
MLAR coatings on glass <1%
ITO coatings 12-15 ohms/square 5-10%

Finished Windows

By design EmiClare windows deliver improved optical performance.

A: Laminate with 0.75mm Non-Glare and clear Hard Coated polycarbonate.
B: Laminate with 1.2mm glass. Plain finish to both surfaces.
C: Laminate with 1.5mm Non-Glare and plain polycarbonate.
D: Laminate with 1.2mm (MLAR) glass and 1.2mm plain glass.