What is the Resin Transfer Molding (RTM) Process?

Resin Transfer Molding (RTM) is a closed-mold process used to manufacture complex, high-performance composite components with smooth finishes on both sides.

The RTM process follows these steps:

  1. Preform Loading: A dry fiber preform (glass, carbon, or aramid) is placed into a matched two-part mold (usually made of metal or composite).
  2. Mold Closure: The mold is closed and clamped tightly.
  3. Resin Injection: Catalyzed liquid resin is injected into the mold cavity under pressure, displacing the air and saturating the dry fibers.
  4. Curing: The mold is heated (or left at room temperature) to cure the resin.
  5. Demolding: Once cured, the mold is opened, and the finished part is removed.

RTM is highly efficient for medium-volume production runs and yields parts with excellent dimensional accuracy and void-free structures.

Typical Processing

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Pultrusion

Pultruded Grating, Tent Poles, Solid Rod, Flat Strip, Square Tube, Hollow Round Tube.

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SMC/BMC

Insulating FRP Parts (Low Voltage), FRP Plates for Water Tanks, FRP Insulators (High Voltage), Sanitary Ware and Auto Parts

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Solid surface

Solid Surface And Artificial Marble Resins, Engineered Stone, Quartz Stone, Granite.

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Hand Lay-up

Chemical Resistance, Tanks & Pipes Resin