Hardcoats are frequently used on polycarbonates and other optical plastics to increase durability by
improving scratch and abrasion resistance. The current study compares several commercially available
hardcoats, both dip-coated and vacuum-deposited materials. Compatibility of the hardcoat with vacuum
deposited optical coats is considered. The successive layers of optical coat and hardcoat on the
polycarbonate result in non-uniform spectral content and visible fringing effects due to thickness variation
and thin-film interference. Experimental results and model correlation are presented.
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