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Old 05-16-2004, 10:53 PM   #1
KerriAnn
Senior Member
 
Join Date: Feb 2004
Posts: 422
Default Comparing plastics- Acrylic, polycarbonate (Lexan), and PETG

not too long ago i bought a huge sheet of acrylic from HD for my mods. ive used it all up now, and i have been looking online at the different types of plastics similar to acrylic that i might be able to use for windows and such. does anyone know the disadvantages of using Lexan or PETG?
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Old 05-17-2004, 12:12 AM   #2
cheapgoose
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Join Date: May 2002
Posts: 3,877
Default Comparing plastics- Acrylic, polycarbonate (Lexan), and PETG

well, I looked into lexan and the dudes from Tap told me Lexan are a bit harder, more brittle and it has a higher melting temperature. this is important because I use my heatgun to soften and bend/shape the pieces.

hope that helps.
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Old 05-17-2004, 01:22 AM   #3
AnnoyedGrunt
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Join Date: Jan 2004
Posts: 539
Default Comparing plastics- Acrylic, polycarbonate (Lexan), and PETG

EDIT:
I had links that worked from Google but they take me to a login screen when I post them here. Strange.

Anyhow, from checking the material properties, I see the following:

Acrylic is actually the most brittle (elongation at break is only 2% or so). Polycarbonate and PETG will elongate much more than Acrylic.

PETG has the lowest deflection temperature, with Acrylic next and Poly @ the highest.

PETG and Ploy are the strongest.

PETG is probably a better choice than Poly because of the deflection temp, but that might only matter if you are bending like cheapgoose.

-D'oh!
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Old 05-17-2004, 04:49 AM   #4
KerriAnn
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Join Date: Feb 2004
Posts: 422
Default RE: Comparing plastics- Acrylic, polycarbonate (Lexan), and PETG

thanks.
i would be bending it- some of the time. i cracked my psu cover in half the other day, so ill need a replacement made for that...
btw- when i made my psu cover, i used my oven to do it. i just put the original psu cover underneath the premeasured piece of acrylic, then put it in the oven at 275 F. for a minute, then bent it over the aluminum cover to shape it.
please tell me there is an easier way, cos if i don't get it right the first time, its very difficult to reheat and reshape it.
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