Typical fiberglass mold structure
A typical fiberglass mold structure typically consists of three parts:
1.Surface layer: Vinyl gel coating;
2.Transition layer: Vinyl resin (surface felt as reinforcement);
3.Structural layer: Vinyl resin, zero shrinkage resin, or unsaturated, or even polyester resin;
Relatively speaking, most hand layup or vacuum (non hot pressing tank) fiberglass molds are made in this way, while for epoxy molds with high temperature resistance requirements, the surface layer (epoxy gel coat) and structural layer (epoxy resin+fiberglass) are mainly composed. Even for molds for small components, a mixture of fiberglass resin can be applied directly to the original mold, and of course, a gel coat surface layer can also be pre made.
Mold gel coat
Note that appropriate fiberglass and treatment methods should be used between each layer of the mold to improve the surface effect and structural performance of the fiberglass mold.
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