Structural Reaction Injection Molding – SRIM

September 12, 2017
SRIM Features Target Applications For SRIM
Glass Reinforcement (Directional or Random) Structural Components
Large Range of Material Properties Reinforcements
Post Apply Painting Multi-Material Structural Parts
Encapsulations, Including Textiles
High Impact Resistance
High Part Stiffness – Structural


SRIM Ranges
Density, g/cc 1.00 – 1.6
Flexural Modulus, ksi 400 – 1500
Tensile Strength, ksi 7 – 18.5
Notched Izod, ft.-lb./in 6 – 16

Composite systems are solid or foamed materials, molded in combinations with long-fiber
reinforcements, such as glass mat or chopped, to improve the system’s mechanical characteristics.

Sometimes referred to as “SRIM”, for Structural RIM, these systems have extremely high stiffness and
high impact strength because of the filler.

Typical applications include door panels, shelves, automotive load-bearing panels, and recreational equipment parts.

At Romeo RIM, the process is a technology that injects the long glass fibers along with the polyurethane system as a one-step process, rather than the
traditional two-step process of inserting preforms and mates into the mold.

The glass is applied to the urethane at the mix head where it is chopped to the desired length and poured/blown into the mold. The mix head, which is attached to a robot, is programmed to move over the open mold cavity while dispensing both the long glass fibers and the polyurethane. At the end of the pour, the mold is closed to form the part. This technology combines the materials used in RIM with the processing of SMC.

Romeorim design guide