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post #21 of 44 Old 03-31-2014 Thread Starter
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Re: Lexan/polycarbonate vs acrylic

Now, is there a special acrylic sheet that is best for marine use or is Plexiglas brand fine?

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Re: Lexan/polycarbonate vs acrylic

Plexiglass (R) brand of acrylic glazing is just one brand. There are probably 20 or 30 different grades of clear Plexiglass alone, and most of the other brands will also have at least two dozen different grades of clear acrylics. Less variety in the tinted colors.

So you need to decide, local or mail order. Then find out which brand they carry, most shops only carry one or two lines.

Then you figure out which grade of the product you want, from what they have available.

In a choice of cast or extruded, some will say you only want extruded but that's going to limit your selection again.
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post #23 of 44 Old 03-31-2014
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Re: Lexan/polycarbonate vs acrylic

I can't say what impact issues you could have on your ports but in the NASCAR division I raced in untill recently, we were required to use only LEXAN for our windshields. It scratches easily and only mild soap and water should clean it, but I had Lexan on one car for 4 years and it was perfectly clean, clear and safe.
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post #24 of 44 Old 03-31-2014
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Re: Lexan/polycarbonate vs acrylic

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Now, is there a special acrylic sheet that is best for marine use or is Plexiglas brand fine?

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Cast acrylic is what is used. The most widely used product in marine applications is Evonik/Cyro Acrylite

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post #25 of 44 Old 03-31-2014 Thread Starter
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Re: Lexan/polycarbonate vs acrylic

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Cast acrylic is what is used. The most widely used product in marine applications is Evonik/Cyro Acrylite
Thanks, Yea I read cast is better. Thanks for the names too. Appreciate it

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post #26 of 44 Old 08-16-2014
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Re: Lexan/polycarbonate vs acrylic

Great thread as it applies to what I'm doing. One question though. My boat has the portlights surface mounted on the inside and screwed into the fiberglass every 3 inches. I need to replace them and would like to go with tinted acrylic. If I use the dow 795 and the 3M VHB tape will it be strong enough without using fasteners. There is some curve but not a lot to fiberglass but again from the inside.
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Re: Lexan/polycarbonate vs acrylic

The thing about VHB tape is that it wants to see perfectly matching contours. Flat on flat or curved to curve, they should mate flush if you want the VHB to bond them. If you can grind or fill to make that happen, call 3M's toll-free number and someone will be able to tell you the exact strength that tape can provide, probably "xx pounds per square inch".
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post #28 of 44 Old 08-16-2014
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Re: Lexan/polycarbonate vs acrylic

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Great thread as it applies to what I'm doing. One question though. My boat has the portlights surface mounted on the inside and screwed into the fiberglass every 3 inches. I need to replace them and would like to go with tinted acrylic. If I use the dow 795 and the 3M VHB tape will it be strong enough without using fasteners. There is some curve but not a lot to fiberglass but again from the inside.
What kind of boat do you have? I have never seen ports installed that way.

Brian
Living aboard in Victoria Harbour
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post #29 of 44 Old 08-18-2014
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Re: Lexan/polycarbonate vs acrylic

I agree- great questions.. (and timely)- I'm going to replace my windows with acrylic and bought both VHB tape and may also use Dow 795 (also happen to have a tube of that), but I'm hesitant to not reinstall with nuts and bolts. I know of another Olson 30 that used just the Dow 795, but for some reason that seems risky. I know I have a long way to go learning about singlehanding, and I just did a 120 nm round trip (and could NOT sleep) but is that stuff so good that nuts/bolts are no longer needed?
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Re: Lexan/polycarbonate vs acrylic

Guys, Dow's data sheets say that 795 is suitable for use on GLASS and aluminum. It is not stated anywhere on their data sheet that it can or should be used on acrylic or fiberglass. It is a silicone rubber sealant, and traditionally those ALWAYS peel off acrylic and release after they've worked for a while.

So...Try 3M's 4000 adhesive, which is designed for polycarbonate and acrylics. Or something else. If the data sheet does not expressly say you can use it with acrylic--it will fail.

VHB tape was just on the history channel, as "one of the world's ten strongest products". But again, that's subject to following the directions.
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