The vinylester resin is a kind of resin highly resistant to corrosion and specially acids. Much better than the polyester resin even the epoxy resin.
Its great mechanical strength allows it to be used with equipments in all kinds of ways.
Among its great features, one of which is that when it's forging, it can have contact with the water without losing its properties, which is in contrast to the others. It doesn't contain styrene.