Low Pressure Molding

Sealed, Rugged… Overmolded.

What is Low Pressure Molding?

Low Pressure Molding (LPM) is a slight variation from conventional injection molding. As the name would suggest, parts are molded at lower pressures, allowing for gentle encapsulation of delicate electronic assemblies.


The Low Pressure Molding Process


The overmolding process involves loading bare, unprotected PCBs and cable assemblies into a precision crafted moldset tool, and then filling the cavity with the appropriate low pressure molding material. This effectively surrounds the component in the desired shape, producing a sealed and protected product that can be immediately handled and tested. The LPM process is ideally suited for replacing epoxy potting processes to save on cycle time and reduce material consumption.

Why Low Pressure Molding?

Conventional injection molding materials require processing temperatures and pressures that would damage a printed circuit board. Low Pressure Molding (LPM) uses thermoplastic materials with very low viscosity, allowing for overmolding and encapsulation of even the most sensitive circuit board assemblies. Because the materials are natural adhesives, the process is well-suited to sealing circuitry against dirt, dust and moisture…in many cases, up to an IP-68 rating.

Low Pressure Molding Video

Cavist low pressure PCB overmolding
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Moldflow Analysis: You get one shot.

Moldflow simulation gives us confirmation in the correct and complete filling of the moldset cavity. By simulating different gating points and flow profiles, we can accurately assess how the material will flow through the cavity, giving us the best chance to deliver sealed, aesthetically pleasing parts right out of the gate.

Low Pressure Molding

Cavist low pressure molding moldflow analysis
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The Right Materials

Cavist has spent decades at the forefront of low pressure molding materials. Because of our background developing low pressure molding machines, we have developed an intimate understanding of how to process hot melt polyamide materials. There are dozens of critical factors that we have only realized over time. Our craft is often oversimplified. Let us guide you through the process. Our experience will save you time and get your product to market. 

You don’t get where we are by mistake...
Or do you?

Cavist has made mistakes and will be the first to admit it. Over 20 years worth. Many during the development of the world’s leading low pressure molding machines. They key is, these mistakes have not been at the expense of any client, and we’ve gained irreplaceable knowledge and experience we’ve incorporated into our process. 

From working with low pressure molding materials, to the durability and longevity of the parts they protect, the Cavist low pressure molding process is unmatched. This kind of experience just isn’t found anywhere else.