Radio Frequency Welding & Dielectric Sealing Machines



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When you’re looking for access to top-quality radio frequency welding machines, also called dielectric sealers, MarkPeri is the comprehensive source your business can count on.

We manufacture an impressive range of RF plastic joining machines representing the cutting edge in the industry. We also provide an extensive inventory of dielectric / RF welding machines from other top U.S. brands. From helping you choose the right material for your rf welding application to machine consultations, you get the selection you want along with customer service and product support dedicated to your complete satisfaction..

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    RF welding, also known as dielectric welding, uses radiofrequency waves to create an airtight seal between two materials. Across the industrial sector, manufacturers also use the names dielectric sealing, radio frequency welding and RF sealing. These processes use radiofrequency energy to join various thermoplastic films by fusing materials from the inside out. The created seal does not leak air, moisture or other components.

    Dielectric welding and heat sealing are distinct processes with noted differences. RF heat sealing equipment uses a combination of external heat and pressure to create a bond. Dielectric welding does not require an external heating source, allowing for more consistency and creating stronger bonds.

    During the process, the radio frequency excites the molecules in the plastic, causing them to move exponentially faster and generate heat. The heat allows the plastic materials to join together, assisted by pressure coming from a plate or compressor. When the materials cool, they become molten and fuse.

    Several kinds of plastic materials commonly used in the RF welding process include:

    • Polyvinyl chloride (PVC).
    • Polyethylene terephthalate (PET).
    • Low-density polyethylene (LDPE).
    • Polyurethane.
    • Nylon.
    • Cellulose acetate.
    • Ethylene-vinyl acetate (EVA).


    RF welders work well for manufacturing products that require a watertight or airtight seal. Because of the fast welding speeds and the fact that the equipment generally stays cool when functioning, this process is ideal for large-scale production operations. Various industries use radio frequency welding applications for products with unique shapes and sizes.

    Manufacturers prefer dielectric welding for many of their high-volume fabrication needs, from consistent straight welds for tarps, plastic doors and signage to distinct shapes such as tent peaks, water tanks and plastic cylinders. Many companies require multiple technologies for different seams in their manufacturing processes.

    Some typical applications include:


    The RF welding process creates leak-proof seams by combining the strengths of the original materials, making the bond as durable as the original materials. The joint is heavy-duty and highly resistant to tears and rips, resulting in a product superior to conventional bonding methods.

    Dielectric welding is an ideal solution for durable seams in heavy-use scenarios under harsh conditions.  Some of the primary benefits of using dielectric welding equipment include:

    • Lower RF tooling costs: Dielectric welding equipment bonds materials with less power and arcing, creating minimal wear on the dies and platens. Less wear on the tooling means a longer life span with higher quality results.
    • Superior weld strength: RF welding machines can outperform conventional equipment by delivering consistent and controllable output power throughout the process. RF welders produce stronger welds without wasting resources and time adjusting to variable operating conditions.
    • Improved energy efficiency: Radio frequency welding equipment often operates on half the power of tube-style plastic heat sealers. These reduced levels translate to lower utility bills and improved efficiencies that can increase your operation’s bottom line.


    Since 1981, our in-house team of electrical, mechanical and RF engineers have been using cutting-edge machines and innovative techniques to advance RF plastic welder technology. With hundreds of machines ranging from 1/2kW to 100kW and combined warehouse space in excess of 40,000 square feet, we offer both turnkey products and tailored solutions based on your specific needs. We have the ability to custom design, modify or adapt radio frequency welders and dielectric sealers for optimal performance no matter the size of the operation or type of application.
    If you’re in the industrial packaging, automotive or medical industry, having the right dielectric welding machine is an operational necessity. Our dielectric welders and RF heat sealers represent exceptional performance and superior energy efficiency. They help you manufacture better products with stronger seals capable of withstanding regular wear and tear and heavy use. You’ll find the following types of RF welders within our inventory:

    Bar Welders — Our MarkPeri bar welders come in 36-inch to 72-inch-wide bar lengths and offer anywhere from 6kW to 20kW power output. Commonly used for sealing long seams found in products such as tarps and liners, our bar RF welding machines for sale feature an exceptionally small footprint, custom mounting of start buttons and a special attachment for punching out grommets for a smoother welding process.

    Small Footprint RF Machines — When space in your production facility is a concern, no other RF welder manufactured in the U.S. is as compact as our small footprint machines. A powerful 25kW version of our reliable 4kW design, this RF plastic welder has helped countless businesses in the automotive and medical industries improve productivity no matter the physical constraints.

    Double Cycle TTBL Machines — Our double cycle RF welding machine delivers ultimate performance and reliability while eliminating the need for additional processing equipment. With a small footprint, this 10kW generator features a stepper motor-controlled double-cycle switch. You get a durable RF welder for plastic that’s suitable for a wide variety of medical applications.


    If you’re searching for a more affordable way to buy radio frequency welding equipment, MarkPeri is a full-service supplier capable of rebuilding all types of machines. We offer value in the reconditioned market by delivering quality and selection along with dedicated customer service, product knowledge and support. Our team of experienced technicians take great care in restoring radio frequency welding machines to “like new” condition. All refurbished RF welders for sale come with a six-month factory warranty.


    MarkPeri is home to the widest range of RF welders for sale for your automotive, industrial or medical applications. We manufacture and sell bar welders, small footprint RF machines and double cycle TTBL machines capable of unlocking the full potential of your operation. Whether you need a cost-effective used or refurbished option or a custom-configured plastic welding machine or additional rf welding information, you’ll find it here. Give us a call for more information and to place your order today!

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