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Our lights are made of polycarbonate. 30% glass filled, to be more specific. Straight polycarbonate is very impact resistant but much too flexible. The glass fill allows for thinner walls,yet greater strength. Walls of less than ..250 that will go to 500 ft. repeatedly. Molded plastics are inherently stronger than machined, which creates unseen stress. Annealing (heat treating) can take care of some of the stress, but this is an additional process. Molded plastic is not without its' undesirable traits either. Shrinkage and warpage are some of the first things to come to mind. Glass fibers, bubbles, plastic temperature, mold temperature, gate location, etc are all factors that must be determined before the mold is produced. Then you still have to shoot parts to see if you got it right. Accurate prototyping is very difficult. Plastics is a very interesting and diverse field. There are many parts made of plastic that just aren't possible with other materials, including metals. Dell Motes Dive Rite 117 W.Washington St. Lake City, Fla. 32055 www.Dive-Rite.com -----Original Message----- From: Christian Gerzner <christiang@pi*.co*.au*> To: techdiver@aquanaut.com <techdiver@aquanaut.com> Date: Wednesday, April 07, 1999 3:45 AM Subject: Re: Yet another Canister light Question >Mark Melendez wrote: >> >> At 11:33 AM 4/6/99 , Steve Lindblom wrote: >> >Can anyone tell me if there is any reason why polycarbonate (Lexan) isn't >> >used for cannisters? It's supposed to be much stronger than acrylic, and >> >isn't all that much more expensive. >> >> It seems that Lexan tubing is only readily supplied with 1/8" wall >> thickness. Which is probably too thin to be used for a canister light. > >Hmmm, Ikelite as just one example make some pretty damn good camera housings >out of this stuff which more often than not would house something a deal more >expensive than a canister light. > >I think it still begs the question ... why not? > >Christian >-- >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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