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Old 05-21-2015, 03:48 PM   #15
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Ultra Guard is what I have on my truck.
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Old 05-21-2015, 05:12 PM   #16
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As a retired plastic fabricator I can tell you this. Polycarbonate i.e. Lexan, can be bent cold if the thickness is 1/8" or preferably even less. .080-.100 I will not relax into the curve but has to be held under tension. This will eventually result in hairline stress cracks. It absorbs water from the air and as mentioned above it must be slowly heated to drive the moisture out before heating it up to 350 where it can be moulded over a jig. This is complicated voodoo and we refused to even attempt such jobs at our shop. It also explains why Harley D windshields are so expensive. It is a lot easier to hot mould acrylic so that is what the stone guads are made of.
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Old 05-21-2015, 05:23 PM   #17
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Can Plexi be installed cold in our AS wrap around window guards?
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Old 05-22-2015, 09:35 AM   #18
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Consider stopdrilling to resist further cracking. Common strategy used in non pressurized aircraft window repair. A small hole is drilled at the leading end of a crack (which distributes stress across a larger area). A clear filler can then be used to seal it.
Method works equally well for metal cracks.
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Old 05-22-2015, 09:32 PM   #19
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Here is a good laugh that will also answer the question about lexan's flexibility. I have a good deal of experience with plexiglass in helicopters. The fix we used in crack repairs was to "stop drill" the extreme ends of all cracks, thus stopping their radiation(growing). On longer cracks after stop drilling we used 18 gage(phone line size) copper wire to lace the crack much like shoe laces after Drilling equidistant holes along both sides of the crack and the ends. Not pretty but functional and met flight safety to exceed 100 knots airspeed. Maybe I'll do mine and post picks.
Another important thing to know about plexiglass or lexan's is to not use any cleaners that have ammonia. It will degrade the polymers and cause chemical induced crazing and eventual failure.
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Old 05-25-2015, 09:07 AM   #20
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Go with Lexan for your rock guards it is more suitable. Above Gearheart states which thickness to safely use. Lexan cold forms to the compound curve just fine. I replaced a busted wing window where the PO had previously put in plexi. The plexi was in awful condition with full length breaks as well as being super yellowed and hazy, it obviously did not weather well.
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Old 05-27-2015, 07:21 AM   #21
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Quote:
Originally Posted by thesignlady View Post
Go with Lexan for your rock guards it is more suitable. Above Gearheart states which thickness to safely use. Lexan cold forms to the compound curve just fine. I replaced a busted wing window where the PO had previously put in plexi. The plexi was in awful condition with full length breaks as well as being super yellowed and hazy, it obviously did not weather well.
OK, so we're back to my original statement in post#4? The polycarbonate, in thinner sheets can be used in the wraparound, newer rock guards, without heating and make the curve in a cold bend.

Incidentally, I don't think any drilling is required in the newer ones. I believe they just slip in the frame with an end removed and are held, floating, with window screen spline.
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Old 05-27-2015, 08:27 AM   #22
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I replaced the cracked plexiglass on my Rockguard with ABS. The ABS sheet has a smooth side and a textured side, I installed smooth side out. Much higher impact resistant but you cannot see thru it.
Very flexible and easy to work with.
Just my take on this issue.
Mike
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Old 05-27-2015, 08:56 AM   #23
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I need to see through it on a 3 piece. The corners do not open like the center one...unless you remove them totally....and that's not a viable option.
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Old 06-04-2015, 01:52 PM   #24
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as far as the crack, you may be able to use some Mek and a syringe. when people build things out of acrylic, you hold 2 mating parts and then squirt the liquid in there and capilary action draws it in, then bonds it, and clear. Weldon makes most of the products. I believe I got some from Southern States.

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