Hi everyone
I'm currently designing my future mill (see appropriate section) which will probably made out of EG.
Maybe this topic has already been discussed, but I don't see a dedicated thread, so here I go.
I see there is only epoxy being used so far. Considering the prolific choice of polymer resins out there, I am pretty confused. I understand Polyester has a consequent shrinkage coefficient which is not suited for casting unless you don't mind warping.
Yet, Epoxy and Polyester resins are mainly used in laminating process. For casting purposes, there are specific resins such as Polyurethane.
I'm not a specialist concerning polymers, but it seems that Polyurethane has interesting properties, it seems decently rigid, and also features low shrinkage, which is the reason it's used for casting. Thus, you can find special casting Polyurethane casting resins such as this one :
Water Clear Polyurethane Casting Resin for Embedding and Rapid Prototyping - Easy Composites
There is also a fast curing one, but as the polymerization is exothermic, that's not good for us.
It seems that the price is comparable to epoxy resin, and maybe even a bit cheaper.
So what do you specialists think ?
Greetings from France
Cyril