I used to work in plastics R&D. Polycarbonate usually melts at about 300C and has to be conditioned in a drying oven for 2 hrs at 102C before being fed into a molder.
Did you mean degrees F not C? Still those numbers are above and below the actual working temperatures used outside the lab.
I'm in the Sign buisness, we use (vacuum form) Polycarbonates and other plastics almost daily.
Drying Polycarb sheeting is done in a 260°F (126°C) oven for 4-24 hours dependent on thickness sheet thickness .030" - .250". 4 hours for .063" to .125", 12 hours on .187" and 24 hours for .250". Forming is done between 340-400°F with the best average right at 375°F (191°c) for the sharpest detail defination for most .080" to .250" applications.
None of the above however have much at all to do with the Laminating/heating process used to produce CD/DVD media, which also involves a chemical etch and other processes that dramatically chance the structure of the finished material.
That is why the suggestion was for straight clear S-100 Polycarbonate be used instead. I'd be a little leary of even pigmented S-400 Sign grade White or colored polycarbonate as fins since the simple addition of color pigments change the impact resistance of the sheeting.
NukeMMC: if you really think you must use CD/DVD's I've had fair luck cutting them on a band saw with 1/8" x 18T blade at about 2500-3000fpm. or on a mini table saw with an 80T carbide tip blade at about 6000rpm. Drilling holes with standard metal bits at 1750rpm for 1/8" holes and much lower as the hole size increases trying to use as little pressure on the drill or bit as possible. Please ware gloves and face/eye protection while drilling or sawing because if the bit or blade snags the disc will shatter with shards flying....Please be safe.