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Fiberglass shrink factor
2

Fiberglass shrink factor

Fiberglass shrink factor

(OP)
Can someone advise a percentage of shrink factor for fiberglass resin once cured?

RE: Fiberglass shrink factor

2
Polyester resin has about a 6% volume shrinkage on cure compared to less than 3% for epoxy. How the shrinkage shows up in a part can be pretty complex. It may go unnoticed in a wet-laid or vacuum-bagged part but can cause insurmountable headaches in a closed mold where shrinkage results in separation from the mold surface and pitting. Fiber orientation, part thickness, fiber volume and cure temperature are all important factors.

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