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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