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Plastic screens
These
Plastic Screens have still greater diffusion than ground
glass types, allowing an image to be back-projected
on a large screen without `hot spot, and have
a grey tint to minimise reflection of ambient and scattered
light. The 0.3mm PVC material, with a gain of 2.3, is
normally stretched over a rigid frame, where as the
3mmm acrylic (with gain of 3) is self-supporting.
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