What are the advantages of polyurethane resin pultrusion compared to unsaturated resin and epoxy resin?

the mechanical and physical properties of polyurethane resin pultruded products formed by high-pressure injection using a polyurethane resin injection machine are compared to those of unsaturated polyester, vinyl ester, the physical properties of resins such as epoxy resin and polyurethane have been comprehensively improved. take, for example, a certain polyurethane specially formulated for the pultrusion…