Davis In SC said: (quoted from post at 05:16:11 01/08/08) OK, Polycarbonate is much tougher than acrylic, but PC is much easier to scratch, and cannot be exposed to any oils or other hydrocarbons. Just an oily fingerprint will cause PC to stress crack.
Acrylic is much harder, and does not scratch easily. But on the flip side, it WILL shatter on impact.
I dont know about the fingerprint deal as my arm guards were used on sprint cars and they held up to all kinds of oils etc. I will say that I did use GE product only but things like Acetone etc will absolutely destroy Lexan! Like I said, we need to know your application to determine which is best.
I had a few that cracked on my products but most of them broke due to improper installation. Only use a UNIBIT to drill holes in them. A regular bit will leave stress risers etc. and lead to cracking. I had another come apart 1/16th inch thick when 1/2 a brake rotor smashed into it at 100+mph. I was scared to death the driver got injured really bad but when I got to the pits he thanked me like crazy! He thought he was going to get killed by the rotor coming at him but the Lexan absorbed the blow and saved at a minimum a broken arm. He said that his normal fiberglass one would have just let the rotor through will little loss of energy and would have probably put him in the hospital!
Lexan is TOUGH stuff!
Joe
PS. You can flame polish Lexan by using a propane torch and lightly heating up the lexan. Practice on a piece you dont need until you get the technique down. Just scuff up some scrap pieces and place the flame near the lexan without actually touching it and keep the flame moving. You will see the scuff marks disappear. If you see it bubble you got the lexan too hot!
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