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Go Back   SailNet Community > On Board > Gear & Maintenance > Lexan/polycarbonate vs acrylic
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Thread: Lexan/polycarbonate vs acrylic Reply to Thread
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Topic Review (Newest First)
10-04-2014 09:57 AM
edneely
Re: Lexan/polycarbonate vs acrylic

Quote:
Originally Posted by mitiempo View Post

That is not much of a curve so it shouldn't be a problem.

How do you know it is Lexan?
Cool. Thanks.

I called the builder, to see if he had replacement panes. He said not for 20 years. He told me they are Lexan, and just about any glass company could cut them for me.
10-04-2014 09:55 AM
edneely
Re: Lexan/polycarbonate vs acrylic

Quote:
Originally Posted by hellosailor View Post

ed-
If the plastic has a simple curve, just bends in one axis, that should be no problem. If it is a compound curve bending in two axis, you'd probably have to shape it or bolt it to make it conform.
Thanks. The curve looks one dimensional to me, looking at that photo again.
10-03-2014 11:58 PM
mitiempo
Re: Lexan/polycarbonate vs acrylic



That is not much of a curve so it shouldn't be a problem.

How do you know it is Lexan?
10-03-2014 04:19 PM
hellosailor
Re: Lexan/polycarbonate vs acrylic

Amazon.com: Novus 1, 2, 3 Kit Plastic Polish and Scratch Remover 8 oz. on 3 bottles inside Kit: Automotive Amazon.com: Novus 1, 2, 3 Kit Plastic Polish and Scratch Remover 8 oz. on 3 bottles inside Kit: Automotive



Novus has been making great stuff for a long time. The bigbox stores and a lot of plastics suppliers usually carry it as well.

ed-
If the plastic has a simple curve, just bends in one axis, that should be no problem. If it is a compound curve bending in two axis, you'd probably have to shape it or bolt it to make it conform.
10-03-2014 12:31 PM
asdf38
Re: Lexan/polycarbonate vs acrylic

Quote:
Originally Posted by hellosailor View Post
asdf-
Odds are those will buff out with the appropriate polish.
Like what kind of polish?
10-03-2014 12:22 PM
edneely
Re: Lexan/polycarbonate vs acrylic

I want to replace my deadlights as well, and there is a log of very good information in this thread. Thanks to all who have contributed.

My Precision P23 has Lexan deadlights about 51 inches long, with screws around the perimeter. I'd like to replace them and leave off the screws, using 3M VHB and Dow 795.

I might have missed an answer to the question about having a slight curve to the window. Will acrylic work? Can I use the no-screw flush mount method as described in the Sail article and by others here?

The last photo below is taken edge-on, and shows the amount of curve.





09-29-2014 02:22 PM
hellosailor
Re: Lexan/polycarbonate vs acrylic

asdf-
Odds are those will buff out with the appropriate polish.

gs-
What thickness you "should" use depends on what you want to keep out. Spinnaker pole breaks loose and torpedoes the portlight? That's going to take more strength than fair weather splashing. Broach the boat and have a 20-foot wave drop onto the portlight? You'd be surprised at how much force that can generate.
For a no-numbers practical compromise, 1/4" acrylic is fairly common and affordable. That "should" keep a lot of stuff out, including the occasional crew walking on it during the broach. See if your seller has any grade of acrylic that is uv- and scratch-resistant for exterior glazing, not just the stuff they make napkin holders out of.
FWIW the great Fastnet investigation concluded that portlights should have the same failure strength as the structure they are set into. That could mean 1/2" or more, if you're planning for those conditions.
09-29-2014 01:17 PM
asdf38
Re: Lexan/polycarbonate vs acrylic

Just a couple comments

1) I've used VHB tape in a bunch of places. It's not suited for everything but it's good stuff. It's currently holding my VHF to the cabin ceiling among a other things.

The easiest place to buy it from is McMaster, which sells at least 2 dozen versions of it. Always in stock.

Home depot also carries a few consumer versions marketed as exterior mounting tape.

2) Lexan really does scratch up easily. I just made the mistake of trying to clean my lexan hatchboards with a scotch pad and I fogged it up by putting tiny scratches in it (I didn't notice at first because it was so dirty the scotch pad was still making it better). I'd care except there are so many other scratches the new ones don't really register.
09-29-2014 11:31 AM
gstewart8
Re: Lexan/polycarbonate vs acrylic

Can anyone tell me what thickness of acrylic pane should be used for windows about 8" x14"?
08-19-2014 11:41 PM
mitiempo
Re: Lexan/polycarbonate vs acrylic

From Select Plastics, the largest hatch rebuilder in the world. Home

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