Shenzhen Alu Rapid Prototype Precision Co., Ltd.

Yes, EPDM (Ethylene Propylene Diene Monomer) can be injection molded. It's a common and effective process for producing high-volume, precise rubber parts, especially in industries like automotive (seals, gaskets, weatherstripping), construction, and HVAC.

How EPDM Injection Molding Works

EPDM is a thermoset rubber, so the process differs from thermoplastic injection molding:

1.The compounded EPDM (mixed with curing agents, fillers, etc.) is fed into a heated barrel and screw, where it's plasticized (softened) but not fully melted like plastics.

2.It's injected under high pressure into a heated mold (typically 160–200°C or adjusted per formulation) to fill the cavity.

3.Inside the mold, the material undergoes vulcanization (cross-linking/curing) under heat and pressure, turning it into a solid, elastic part.

4.The mold is then opened, and the part is ejected (sometimes with post-curing for full properties).

This allows for complex geometries, tight tolerances, and efficient production compared to alternatives like compression or transfer molding.

Advantages

Excellent for high-volume runs with consistent quality and minimal waste.

EPDM's natural properties (UV/ozone/weather resistance, temperature stability from -40°C to +150°C, chemical resistance) make molded parts durable for outdoor/harsh environments.

Challenges and Considerations

1.Requires specialized equipment and precise control (temperature, pressure, venting) to avoid defects like scorch (premature curing), shrinkage (10–20%), air traps, or flash.

2.Cycle times can be longer due to curing needs.

3.Not all EPDM formulations flow equally well—some are optimized for injection.