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RF Preheaters


RF Preheaters preheat molding materials uniformly, rapidly and with greater efficiency including materials such as phenolic, melamine, urea compounds, and polyester. These materials are being processed either by compression molding or transfer molding. Therefore, molding these materials without preheating lengthens molding time, and increases tooling wear resulting in deterioration of product quality and increase of rejects.

In the past, electric or infrared heating was used to reduce these problems, but today high-frequency preheating is the method of choice. Unlike the conventional heating which transfers heat by conduction from the outside of the material to the inside – high-frequency heating generates heat inside the material. The alternative high frequency electric field generated inside the RF Preheater causes the polar molecules of the material to be heated to continuously align themselves with the field. The friction resulting from molecular movement causes the material to rapidly heat throughout its entire mass.

Proudly made in the U.S.A.

Click to see the Product Technical Specification section.
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Preheating of thermosetting plastics for compression molding.

  • Phenolic | Phenol-formaldehyde (Bakelite)
  • Urea-formaldehyde (Melamine)
  • Polyester
  • Epoxy
  • RFGC
  • Preheating and curing of polyester, urethane, epoxy, urea, silicone, synthetic rubber, and phenolic resins
  • Adhesive curing
  • SMC (Sheet Molding Composite) Bonding
  • Bulk or granular solids
  • Testing/heating studies
  • General drying
  • Preform Rotators are available to enhance heating uniformity.
  • Heat Delay Timer
  • IR Temperature Sensor Integrated into the Heat Cycle
  • Remote Cycle Start/Stop Function
  • Power Output Available in 5kW, 10kW, 12.5kW, and 20kW
Rf Preheaters

Product Technical Specifications for the RF Preheaters



Associated Parts

  • RF Oscillator Tubes - Part T57-1046
Thermex Strip 01


RF Preheaters – RF Preheaters are dielectric heaters used to preheat materials prior to other manufacturing processes.  Radio Frequency Preheaters are frequently utilized for compression molding resulting in stronger, temperature resistant thermoset plastic.