The Properties of High Modulus RIM Urethanes

Reaction Injection Molding is rapidly becoming accepted as a viable industrial process for preparing large intricate parts using reactive urethane intermediates. High modulus polymers are among the newest systems capable of being prepared using the RIM process. Proper balance of the many features of urethane chemistry and technology allows preparation of high modulus material with excellent properties, including impact resistance.

Fillers can be added to these high modulus polymers to increase their moduli even further. Studies have shown that milled fiberglass added to certain polymers can result in a composite with a flexural modulus in excess of 320M psi (2206MPa).