Cast allyl carbonate is a high quality substrate for optical filters. However this is still a plastic material, and although at SEM we take every care in its production, blemishes do occur. These blemishes take the form of small inclusions and fine, trapped fibres. So that SEM can quantify the quality of products made from allyl carbonate, it is important to lay down a specification and inspection criteria. This is a specification that we feel is obtainable and repeatable, when viewed against our past performance. With individual project discussions, it may be possible to tighten up the specification, but this will be done by inspecting out defects and will have obvious implications on price.
Inspection Conditions.
The panel should be viewed from the front face under daylight conditions, with normal non-directional lighting. Viewing should take 15 seconds and from a distance of 450 mm.
Blemishes.