Quote:
Originally Posted by halekai36
Actually Syon most of the blue water type ports are made of very thick tempered glass.
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That's my experience as well: The heavy-duty, solid bronze or stainless, through-bolted portlights used in purpose-built bluewater boats have thick, tempered, laminated safety glass.
Less robust portlights typically have plastic frames and lenses. In between, there are the aluminium frames with plastic (acrylic or polycarbonate) lenses.
Polycarbonate (Lexan) is a good strong substitute for tempered glass, but is susceptible to UV degradation in the long run. Available at local glass shops, as others have pointed out.