Polycarbonate has some really good characteristics and some really bad ones. It can take a whole lot of energy and not fail...but it can also break just under static stress when it comes in contact with certain chemicals. The really bad thing is when it fails, it fails almost explosively. Really good for motorcycle helmets as long as you throw it away after the first crash.
https://sites.google.com/site/mykr2stretch/ On Mar 10, 2013 9:28 AM, "Larry&Sallie Flesner" <flesner at frontier.com> wrote: > At 03:22 AM 3/10/2013, you wrote: > >> ensure that the lens is blown rather than flat wrapped and reliant on the >> attachment screws for maintaining the curvature. >> > ++++++++++++++++++++++++++++++**++++++++++++++++++++++++++++ > > A lens can be formed over a mold of the lead edge covered in felt, then > placed in your kitchen oven at low heat. When it starts to droop, remove > from oven, and with a pair of soft gloves, pull down to conform to the > mold. I can't imagine what the defect was in the lens in the reported > accident to cause it to split exactly down the middle. > > Larry Flesner > > > ______________________________**_________________ > Search the KRnet Archives at > http://tugantek.com/**archmailv2-kr/search<http://tugantek.com/archmailv2-kr/search> > . > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see > http://list.krnet.org/mailman/**listinfo/krnet_list.krnet.org<http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org>to > change options >
