Low pressure molding is an encapsulation process that uses thermoplastic hot-melt adhesives injected at very low pressures — typically between 1 and 5 bar — to surround and protect electronic assemblies. Unlike traditional high-pressure injection molding, which can crack or shift delicate solder joints, the low-pressure approach gently fills the mold cavity around the components without subjecting them to mechanical stress.
The technology originally emerged in European automotive manufacturing, where it was developed to ｒｅｐｌａｃｅ older potting and sealing methods that were slow, messy, and difficult to rework. Today, low pressure molding for electronics has spread across medical devices, industrial sensors, LED lighting, connector harnesses, and consumer electronics — anywhere that reliable environmental protection is required in a compact form factor.
Manufacturers often weigh low pressure molding against conformal coating when planning board-level protection. Both serve to shield circuit boards from environmental hazards, but they differ significantly in protection level, application method, and suitable use cases.
| Aspect | Conformal Coating | Low Pressure Molding |
|---|---|---|
| Protection level | Thin film barrier against moisture, dust, and mild chemicals | Full encapsulation with thick protective body against water, vibration, and impact |
| Process pressure | Spray or dip — no injection pressure on components | Low injection pressure (1–5 bar), safe for delicate parts |
| Cycle time | Minutes of spraying plus drying/baking time | Seconds to minutes per part, no curing phase needed |
| Best suited for | Dense PCB assemblies needing a lightweight protective film | Connectors, sensors, and modules needing rugged mechanical and waterproof sealing |
| Reworkability | Limited; removal requires solvents or thermal methods | Material can be softened and removed with heat |
In practice, many products benefit from both: a conformal coating applied to the full board for baseline protection, supplemented by low pressure molding on specific connectors or sensor modules that face direct exposure to water or mechanical stress. Farway Electronic offers both services under one roof, allowing customers to combine them without coordinating multiple suppliers.
The versatility of low pressure molding makes it valuable across several demanding industries. Each sector presents unique environmental challenges that the encapsulation process is well equipped to address.
Vehicles expose electronic control units, sensor modules, and wiring connectors to constant vibration, temperature cycling, and moisture. Low pressure molding for automotive electronics provides vibration damping and waterproof sealing for components such as anti-pinch window lifter controllers, playback function boards, and battery management modules — all products that Farway manufactures for transportation industry customers.
Medical sensors and wearable monitors require biocompatible encapsulation that withstands sterilization and body-fluid exposure. Low pressure molding materials can meet these demands while maintaining the compact form factors that portable and implantable devices require. Farway holds ISO 13485 certification for medical device quality management, positioning the company to support medical-grade encapsulation projects.
Factory-floor sensors and outdoor LED modules face dust, humidity, and thermal shock. Encapsulating these assemblies with pcba low pressure encapsulation creates a sealed housing that protects against ingress and extends service life in harsh operating conditions.
Farway Electronic operates four low-pressure injection moulding machines at its 2,000-square-metre production facility in LongGang, Shenzhen. The company's low pressure molding service covers the full project lifecycle — from technical consulting and engineering support through product and mould development to volume production.
Because Farway controls the entire manufacturing chain, customers can move from prototype to volume production without transferring tooling or redesigning for a new supplier's process constraints. The same engineering team that reviews your BOM and DFM feedback also oversees the molding process, ensuring that design intent carries through to the encapsulated product.
Encapsulation is only as good as the testing that validates it. Farway integrates comprehensive inspection and testing into every production run, applying IPC-A-610 assembly standards and a multi-stage quality control process.
After molding, boards pass through pcba testing that can include AOI optical inspection, X-ray inspection, ICT circuit testing, FCT functional testing, thermal imaging, and high- and low-temperature reliability testing. This verifies not only that the encapsulation is intact but also that the electronics underneath continue to function correctly after the molding process.
Selecting a low pressure molding supplier involves more than comparing quotes. The right partner should demonstrate engineering depth, process control, and the ability to scale from prototype to production without quality drift. Consider these practical questions when evaluating potential suppliers:
Farway Electronic addresses each of these points with an integrated service model, four molding machines, certified quality systems, and the ability to handle orders ranging from a single prototype piece through large-batch production.
Hey there! Your message matters! It'll go straight into our CRM system. Expect a one-on-one reply from our CS within 7×24 hours. We value your feedback. Fill in the box and share your thoughts!