Lexan/polycarbonate vs acrylic - Page 2 - SailNet Community
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post #11 of 44 Old 03-27-2014
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Re: Lexan/polycarbonate vs acrylic

I'm having nightmares from seeing that much wood on deck.

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post #12 of 44 Old 03-27-2014 Thread Starter
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Re: Lexan/polycarbonate vs acrylic

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I'm having nightmares from seeing that much wood on deck.
Haha! Yea it will be coming off next year and getting replaced with synthetic teak.

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post #13 of 44 Old 03-27-2014
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Re: Lexan/polycarbonate vs acrylic

Acrylic is harder, more scratch resistant. Polycarbonate can take more abuse, it's more impact resistant. It's what they use for hockey dashers, motorcycle helmets, visors and the like. Expansion isnt a problem until you get into big peices of dark material. We deal with poly sheets up to 39 feet long. Then it's an issue.
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post #14 of 44 Old 03-28-2014 Thread Starter
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Re: Lexan/polycarbonate vs acrylic

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Acrylic is harder, more scratch resistant. Polycarbonate can take more abuse, it's more impact resistant. It's what they use for hockey dashers, motorcycle helmets, visors and the like. Expansion isnt a problem until you get into big peices of dark material. We deal with poly sheets up to 39 feet long. Then it's an issue.
I got ya, well what about discoloration from not being uv stable?

And I read that ocean salt water can scratch lexan.. That's no good

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post #15 of 44 Old 03-28-2014
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Re: Lexan/polycarbonate vs acrylic

Acrylic will outlast polycarbonate by a very large margin. Every major hatch manufacturer uses acrylic and for good reason.

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post #16 of 44 Old 03-28-2014
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Re: Lexan/polycarbonate vs acrylic

synthetic teak on a boat? is this something new? im all ears

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post #17 of 44 Old 03-28-2014
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Re: Lexan/polycarbonate vs acrylic

It's not new. Here is one example. Synthetic Marine Teak Decking Solutions | Nuteak Flooring
Expensive though - some is $30 a square foot. Most often seen on large powerboats where cost isn't an issue.
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post #18 of 44 Old 03-28-2014
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Re: Lexan/polycarbonate vs acrylic

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Acrylic will outlast polycarbonate by a very large margin. Every major hatch manufacturer uses acrylic and for good reason.
That's the balancing act. Poly is more expensive than acrylic but at the size they would be using, not a show stopper. They would then look at whether impact is less of a consideration than abrasion. In marine conditions, this is probably the case. Another issue might be that poly absorbs water, not like a sponge or anything, but enough to require 24 hours of drying prior to thermo-forming. A couple of years ago, we abandoned poly in lieu of impact modified acrylic. It's softer than standard acrylic so it can take a blow and not fracture. Not sure about abrasion resistance on that but I assume it's similar to poly. There is another product called co-polyester. We use it for hurricane units but I don't think the pigmenting (or lack ther of) is stable. Best bet is acrylic. What ever you do, don't use any type of urethane on it and clean with soap and water only. Window cleaner will cause crazing of the surface.
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post #19 of 44 Old 03-28-2014
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Re: Lexan/polycarbonate vs acrylic

boatboy, take a look online at what the plastics manufacturers have to say. PPG, Dow, GE, Rohm & Haas, whoever is in the game today.

Most of them have installation guides online which will show you the methods you can use. VHB tape is a great option, it holds windows in skyscrapers.

But on the glazing material itself, you don't just want to go to the local plastics place and buy "plastic". Every maker, every plastic (acrylic or polycarbonate) comes in different grades and unless you buy UV-resistant and scratch-resistant material, designed for use as exterior glazing, you will be disappointed in how the usual cheap stuff (intended for napkin holders and towel racks) holds up on your boat.

Buying the right stuff is going to cost more up front, but last way better on the boat.

VHB tape, like everything else, can be ordered discounted from Amazon, but some of the vendors will take a month to ship it, as they batch order it from 3M. Worth ordering ahead of time if that's what you need. And 3M also has web pages explaining the different colors, thicknesses, and widths of tape available.
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post #20 of 44 Old 03-29-2014
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Re: Lexan/polycarbonate vs acrylic

Stick to acrylic . Lexan (polycarbonate) fogs up in three years, so you wont see anything thru it after that.

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