Overmolding is a common method for protecting electronic assemblies, adding a molded thermoplastic or elastomer layer for sealing, strain relief, and mechanical protection.
In high-pressure processes, however, that same protection can come at the cost of component damage. Low-pressure overmolding addresses this by encapsulating assemblies without introducing excessive mechanical or thermal stress.
iCONN Systems applies this process to custom cable assemblies and connectors designed for harsh environment applications.
What Is Low-Pressure Overmolding and Why Does it Matter?
Low-pressure overmolding encapsulates electronic components using low-viscosity thermoplastic adhesives, typically polyamides. These materials flow easily at reduced injection pressures, allowing complete mold fill without damaging sensitive assemblies.
Typical processing conditions include lower pressures and temperatures compared to conventional injection molding, reducing mechanical and thermal stress on components. Short cycle times further minimize exposure during processing.
During the process, components are placed into a pre-designed mold. The thermoplastic adhesive is heated to a flowable state and injected into the mold cavity, where it surrounds and encapsulates the assembly. The material then cools and solidifies before the part is removed for downstream processing.
Low-pressure overmolding is often evaluated as an alternative to traditional potting and encapsulation. In potting, assemblies are enclosed in a housing and filled with resin, which cures into a rigid structure.
While effective for sealing, potting creates a permanent enclosure that limits rework and can introduce stress at cable exit points. In contrast, overmolding provides integrated strain relief and a more flexible protective layer.
Benefits of Choosing Low-Pressure Overmolding vs. Traditional Potting and Encapsulation
More and more manufacturers are choosing low-pressure overmolding as a protective shielding technique that's less aggressive on the assemblies and less irreparable than potting and resin encapsulation.
In practice, this approach offers several advantages over potting and encapsulation:
- Environmental sealing against moisture and contaminants
- Integrated strain relief that reduces stress on cables and connectors
- Resistance to vibration and mechanical shock
- Lower material usage compared to full encapsulation (application-dependent)
- Improved manufacturability and cycle efficiency
Low-pressure overmolding is commonly used in applications such as:
- Cable assemblies and wire harnesses
- Sensors and sealed electronic connectors
- Printed circuit board (PCB) protection
- Harsh environment interconnect systems
iCONN Can Help Ruggedize Your Next Electronics Assemblies
iCONN Systems provides custom cable assemblies, connectors, and overmolded solutions designed for demanding environments. Our engineering team supports design, prototyping, and production, ensuring each assembly meets application-specific performance requirements.
Our capabilities include overmolded cable assemblies and sealed electronic connectors built to perform in harsh conditions. Manufacturing processes align with ISO 9001:2015 quality standards and applicable environmental regulations such as RoHS and REACH.
Contact our team to review your application requirements, discuss design constraints, or request a quote for your next overmolded assembly.
