I gather that they are opening type ports
, given the description? If so, more often than not, they have a heavy (metal) ring, secured to the frame, which secures the glass, plus a gasket
in place. And given that, it allows you to do a replacement yourself.
One option would be Lexan
(Polycarbonate) with a scratch resistant finish. It's easy to work with, & the cost is moderate. Just remember to allow for thermal expansion when cutting it to size.
Choice #2 would be Acrylic
. It's not as tough as Lexan
, although the cost is less. And for smaller expanses of area, it typically does the job. Plus, with it, replacing the glass can be a DIY job as well.
Option #3 is tempered glass. It'll be the priciest, & very tough, assuming that you get the correct grade/type.
On this, you might need a bit of professional assistance, & or consultation. However, as they say, forewarned is forearmed. Meaning that it might pay (literally) to do some research
into the various types of glass made, & of them, which are used, in what specific marine/maritime applications.
To this end, some of the info might be found in a thread on a similar topic made several weeks back. If you do a back search of my posts, it'll turn up.
And one of the great resources mentioned therein, is Professional Boatbuilder
Magazine. Several years ago, they did a very lengthy, in depth
article, on what the various types of glass that are made are. And of them, which are appropriate for which specific marine/maritime applications.
It (the article, & the magazine) are well worth the read. So I can't see as how contacting them would hurt, including, picking up a back issue of the month/year of that particular issue.
Ah, & if you're not getting the answers, & or ideas which you're seeking, or just want more info to have as a knowledge base on this topic. Ask some more targeted, & specific questions. In addition to posting
some pics of the problem at hand. The latter usually helps a LOT.
- Oh, & on the insulation thing, there are a few more options. If you're looking for insulation only, to go along with some relatively inexpensive new glass. You can always just trim some closed cell foam to fit inside of the recesses of the frames, on top of the glass.
Or, you can secure some bubble pack in place, in the same location.
And if you're handy with tools, you can fabricate a wooden trim ring, to go around that of your ports
. Routing into the frame, a rebate for a thing 1/8" piece of acrylic
that you can affix with screws. Or some variation on this theme.
Good luck with the project!