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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 then processed through compression molding or transfer molding. 

However, molding these materials without preheating equipment will slow down duration, lengthening the process. Moreover, this will increase tooling wear and tear — deteriorating product quality and risking more rejects. In the past, manufacturers used electric or infrared heating to reduce these problems. Today, high-frequency preheating has become the standout method of choice. 

With conventional heating, conduction transfers heat from the outside of the material to the inside. The high-frequency difference: this heating process is able to generate heat directly inside the material. The inside of the RF Preheater has the capacity to generate an alternative high frequency electric field. This in turn heats the polar molecules of the materials. Simultaneously, these molecules continuously align themselves with the field. The molecular movement creates friction, causing the material to rapidly heat throughout its entire mass.   

Visit ThermaLab to test your product in an RF Preheater.

Proudly made in the U.S.A.

Click to see the Product Technical Specification section.
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Preheating, softening, and curing thermosetting plastics for compressed molding, transfer molding, and extrusion molding.

  • Phenolic pucks
  • Bakelite
  • SMC (Sheet Molding Composite) Bonding
  • Melamine tableware
  • Epoxy
  • Urea-formaldehyde
  • Synthetic rubber
  • Polyester
  • Silicone
  • Bulk or granular solids
  • Electric vehicle components
  • Automotive brake pistons, electrical insulators; ignition, suspension, and steering components
  • Aerospace rocket nozzles, nose cones, ablative shields
  • Electric and micro electric component housings
  • Circuit board connectors, switches, housings
  • Electrical insulation gaskets, seals, connectors
  • Antenna radomes, reflectors, feed horns
  • Composite gears, casters, linkages
  • 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
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Product Technical Specifications for the RF Preheaters

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Our Breadth of Expertise Has Changed the Way Industries Achieve Production

For over 80 years, Thermex-Thermatron has pioneered cutting-edge technology, advancing the RF Preheating arena. Engineering shorter compression molding times, our RF Preheater Systems enhance performance. Thermex-Thermatron equipment is made to achieve even curing without overheated, uncured areas. 

A Long-Time Leader in Developing Efficient RF Preheating Technology

Manufacturers need innovative, highly developed equipment poised to tackle unique RF heating characteristics. Using industry-leading dielectric heating tools allows you to unlock exceptional material performance from thermoset plastics. It doesn’t just come down to precision. Through quicker production, industries can meet crucial expectations, delivering mass volumes with durable yields. 

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Elevate The Production of Your Raw Materials

During the manufacturing process, our RF Preheater activates when the molding compound quickly heats, reaching its softening point within a minute. Thermex-Thermatron RF Preheaters empower thermoset resin materials to achieve molding temperature rapidly. With proven, impactful technology, you can reap the benefits of RF preheating — transforming product quality through accelerated speed. 

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Epoxy Molding Compound

Two differing kinds of chemicals merge when forming this copolymer. Through silica and epoxy resin, EMC fortifies semiconductor circuits. Epoxy molding compound is made to withstand external variables; from heat to various moistures.

Heat Transfer

As heat moves across a system, a difference in temperature creates a catalyst, bringing about the transfer of thermal energy between points. Accordingly, the greater the motion of a matter’s molecules, the greater the build of its potential heat energy. 

Composite Materials

The synthesis of a pair of materials with unique properties (both physical as well as chemical). When combined, these materials create a powerful conglomeration. Using radio frequency, preheating composite materials allows for a specialized strength. This then sharpens a product’s overall properties. 

Thermoset Resin Materials

A tier of products that includes vinyl esters, epoxy, as well as unsaturated polyesters. With ideal resistance to solvents, thermoset resins sustain cross-linking polymer chain reactions. Molecules join together to create three-dimensional networks. 

After curing any kind of thermoset resin material, the polymers extracted cannot be reversed. Thermoset resin materials are able to withstand a significantly higher heat resistance. As such, the strength of these materials outperforms general thermoplastics. 

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