Pultrusion Grade Vinyl Ester Resin

Pultrusion Grade Vinyl Ester Resin is a low-viscosity bisphenol A-based vinyl ester specifically formulated for the continuous pultrusion process, enabling the production of structural profiles with the chemical resistance and mechanical performance of vinyl ester at process economics competitive with polyester grades. The resin is designed for die temperatures of 130-170°C with peroxide initiator blends (BPO/TBPB or TBPB/TBPA).

At 150-300 mPa·s viscosity at 25°C, the resin enables wet-out of high glass content (55-65% fiber volume) reinforcement packages in the resin bath without excessive drag. Bath stability is maintained for 4-6 hours at ambient temperature. The sharp cure profile at die temperatures gives clean profile surfaces and dimensional consistency at pull speeds of 0.3-1.2 m/min.

Cured pultruded vinyl ester profiles at 60% glass exhibit flexural strength of 400-500 MPa, flexural modulus of 28-35 GPa, and excellent chemical resistance to acids, alkalis, and solvents in chemical plant service. This resin is used for pultruded chemical plant grating, structural profiles for offshore platforms, wastewater treatment FRP structural members, and ladders and platforms in corrosive industrial environments.