The answer is thermoset injection molding is quite similar to traditional injection molding with thermoplastics. Thermoset materials such as phenolics are gathered in a material hopper, and then fed through a hot screw and barrel at around 170F-240F depending on the material formulation. The material is injected into an even hotter mold (around 350F) via sprue and runner system, feeding the cavity or cavities and filling the molded part. Other thermoset materials such as Bulk Molding Compounds (BMCs), which are unsaturated polyesters and vinyl esters are fed to the screw and barrel using a hydraulic stuffer ram, and injected, molded, and cured the same way as phenolics.

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To provide your large plastic parts, we focus on the smallest of details. We achieve precise measurements with our large-tonnage presses to ensure your part's form, fit, and function meet expectations. With custom plastic injection molding presses ranging up to 1,500 tons of clamp and over 50 types of resins to choose from, our facilities are specially equipped and designed to handle your large orders from start to finish.

Thunderbird Molding has the engineering expertise to meet the challenges of producing larger parts. To ensure the success of your finished large parts, our engineers work with you on the right design, the right materials and resins, and the right press to prevent costly freeze-offs and short shots. We engineer molds to complete your custom plastic injection molding project on time, reduce your costs, increase your parts quality, and optimize performance.

Many of our customers or prospective customers ask about thermoset molding. What is it? Can you injection mold thermosets? How does it differ from thermoplastic injection molding (ie, nylon, ABS, PP)? How does it process?