Vinyl/poly resin mold shrinkage and deformation

Author	Message
20_rc51_00	20_rc51_00 posted 11 Years Ago Topic Details
Group: Forum Members Posts: 95, Visits: 548	I realize that there is a greater amount of shrinkage with these to resin types over epoxy. Is the shrinkage or warpage apparent in a free standing form during cure or would it also become apparent with making a mold over a plug? I would think that if laying over a plug and allowing the curing process to take place with the plug intact this would be minimal or irrelevant. Any thougts? My second question is if using such a mold with the reinforcement in the mold and infusing and curing at elevated temps/post cure will the mold be subject to relaxation of internal strain etc? This could effectively destroy the tolerances of a part. I have been using epoxy for molds simply because I'm not totally sure I understand the limitations of poly/vinyl. poly/vinyl have a better $, decent Tg's typically so I would like to use them more in cases where they would be suitable.
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Matthieu Libeert	Matthieu Libeert posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 955, Visits: 3.4K	I always use a vinylester gelcoat back with fiberglass... let your parts cure and postcure while on the plug and you shouldn't have much deformation on your moulds while using them at higher temp... but all polyesterresins and vinyl esters are different so do some testing before Matthieu Libeert Founder MAT2 Composites X Sports website: www.mat2composites.com
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