Resin Transfer Molding (RTM)
Thermoset composite manufacturing using Resin Transfer Molding
Resin Transfer Molding (RTM) is a closed manufacturing process that combines dry fiber preforms with controlled resin injection. BIONTEC relies on Resin Transfer Molding for high-quality, reproducible composite components with consistent mechanical properties and excellent surface quality.
Resin Transfer Molding (RTM) is a closed manufacturing process for fiber-reinforced plastics, in which dry fiber preforms are infiltrated with resin in a two- or multi-part mold. The separation of fiber preform and resin infusion allows for precise process control over material usage, fiber volume content, and component quality. After inserting the dry fibers, the low-viscosity resin system is injected into the closed cavity, completely saturating the fiber structure and curing under defined conditions. This establishes Resin Transfer Molding as a preferred technology for high-quality, reproducible composite components with excellent surface quality.
Suitable Resins for Resin Transfer Molding
RTM allows the processing of a wide range of thermoset matrix systems (resins). At BIONTEC, the resin is selected in close alignment with the specific requirements of each application to ensure optimal mechanical performance, process reliability, and cost-effectiveness.
How the RTM Process Works
The Resin Transfer Molding process begins with positioning the dry fiber preform in the mold. After closing the cavity, resin injection takes place via defined inlet points, while venting channels ensure uniform flow without air entrapment. The vacuum within the cavity supports complete infiltration and minimizes porosity.
At BIONTEC, RTM is preferably combined with Tailored Fiber Placement. Load-path-optimized TFP preforms are placed into RTM molds and consolidated into highly load-bearing composite structures through controlled resin infusion.
Preform Positioning
Precise placement of the dry fiber preform into the mold
Mold Closing
Creation of the defined cavity geometry
Vacuum Generation
Removal of air from the fiber structure
Resin Injection
Controlled resin infiltration under defined pressure
Curing
Temperature-controlled crosslinking of the matrix system
Demolding
Removal of the consolidated component
BIONTEC offers comprehensive expertise across the entire RTM process chain. From preform development and mold design to series production, we support composite projects with deep technical know-how and reliable process control. The combination of Resin Transfer Molding and Tailored Fiber Placement enables load-path-optimized component solutions for mechanical engineering, medical technology, robotics, aerospace, and other high-end applications.
