Dave Kruger wrote: > However, some are formulated to require a "post-cure" cooking at an > elevated temperature to establish cross-linking. These are special > materials. I do not believe ordinary polyester or vinylester resins > benefit from post curing at elevated temperatures; neither do most epoxy > formulations. Another reason for post-curing is to allow for very long working times. If you're laying aircraft skin onto a frame, you don't want the epoxy to have a working time of an hour - you might need a full shift to get the parts all together and ready to cure. Once assembled, you then put it in an autoclave to cure. In other manufacturing environments, they can use UV curing resins. This allows long working times under normal light. Once everything is ready, move into a room with UV lighting and the cure commences. Just because this is used for high-tech products doesn't mean it's the best technique or that it produces a superior product. Mike *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Sun Apr 08 2007 - 09:28:38 PDT
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