Low pressure molding (LPM) is an encapsulation process that uses thermoplastic hot-melt adhesives — typically polyamide or polyurethane-based compounds — injected at very low pressures (usually between 1.5 and 40 bar) and modest temperatures to protect delicate electronic components. Originally developed in Europe during the 1980s for automotive connector and harness sealing, the technology has since spread across medical devices, sensor modules, LED lighting, battery packs, and consumer electronics.
Unlike conventional potting, which pours liquid resin into a housing and waits hours for curing, low pressure molding completes encapsulation in a matter of seconds. The thermoplastic material solidifies rapidly upon contact with the cooler mold surface, forming a seamless, waterproof, and mechanically robust shell around the component. This speed advantage alone can dramatically shorten cycle times and reduce work-in-process inventory on the factory floor.
Compared to traditional potting, low pressure molding eliminates long curing times, reduces material waste, and avoids the shrinkage stress that can crack delicate solder joints. Unlike conformal coating, which applies only a thin protective film, LPM creates a thick, structurally robust encapsulation that shields against physical impact and environmental ingress simultaneously.
These advantages explain why low pressure molding for electronics has become a preferred protection strategy for product engineers who need both speed and reliability in one process.
The versatility of low pressure molding makes it valuable across a wide spectrum of industries. Some of the most common application areas include:
A typical low pressure molding workflow can be broken down into clear, repeatable stages:
| Stage | What Happens |
|---|---|
| 1. Mold and Fixture Design | Engineers design a custom mold (or ｓｅｌｅｃｔ an existing one) tailored to the component geometry, defining wall thickness, gate location, and venting. |
| 2. Component Loading | The bare PCB assembly, connector, or harness is placed into the mold cavity, either manually or with a robotic fixture. |
| 3. Material Melting and Injection | Solid hot-melt granules are heated in a reservoir to a molten state and gently injected into the mold at low pressure. |
| 4. Solidification | The thermoplastic cools and hardens within seconds, forming a conformal shell around the component. |
| 5. Demolding and Inspection | The encapsulated part is removed, visually inspected, and — where required — functionally tested before moving to downstream assembly. |
Because the entire cycle takes well under a minute per part, low pressure molding scales efficiently from prototype validation to high-volume production without major process changes.
Many low pressure molding providers focus narrowly on the encapsulation step alone. Product teams are then left to coordinate separately with a PCB fabricator, an SMT assembler, a testing house, and finally an overmolding vendor — a fragmented chain that introduces logistical risk, quality gaps, and hidden cost.
Farway Electronic, based in LongGang, Shenzhen, takes a different approach. Established in 2018, the company operates a 2,000-square-metre production workshop that integrates the entire electronics manufacturing chain under one roof — from pcb board making process through component sourcing, SMT assembly service, DIP through-hole welding, conformal coating, low pressure injection molding, PCBA testing, and finished-product box-build assembly.
This integrated model means that when a product needs waterproof low pressure injection molding pcb protection, the same engineering team that built and tested the board also designs the overmolding tooling and runs the encapsulation line. There is no handoff between vendors, no mismatched documentation, and no ambiguity about who owns quality.
Farway operates four low-pressure injection molding machines alongside two SMT lines, two DIP plug-in lines, one conformal-coating spraying line, and two finished-product assembly lines — giving customers a genuine single-source path from bare board to packaged, environmentally protected product.
Encapsulation is only as trustworthy as the quality system behind it. Farway holds management-system certifications that span the most demanding electronics sectors:
Product-level compliance scope on the website also includes UL, RoHS, SGS, and REACH. On the assembly side, Farway works to IPC-A-610 for PCBA acceptance and IPC-A-600H for PCB implementation. These standards matter because they define the inspection criteria and process controls that ensure every encapsulated board meets consistent, traceable quality — whether the end product goes into a hospital, a vehicle, or an industrial control cabinet.
Farway's technical team covers electronic engineering, BOM engineering, structural engineering, electronic procurement, maintenance, and testing. This breadth allows the company to support customers at every stage of product development, not just at the encapsulation step.
Value-added services include New Product Introduction (NPI) support, Design for Excellence (DFX) review, program burning, stencil fabrication, fixture production, and repair service. For teams that need finished product assembly service china, Farway can integrate tested PCBA boards with human-machine interfaces, enclosures, wiring harnesses, and connectors into fully packaged, traceable products — complete with SOP-based production, QC full inspection, QA and OBA sampling, and barcode traceability.
The company also provides a comprehensive testing portfolio: SPI solder-paste inspection, AOI, FAI first-article inspection, X-ray inspection, ICT circuit testing, FCT functional testing, thermal imaging inspection, and high- and low-temperature reliability testing. Importantly, Farway backs eligible non-external defects with a one-year free-repair commitment, giving customers a clear post-delivery safety net.
| Capability | Published Range |
|---|---|
| PCB layer count | 1 to 32 layers (rigid, flexible, rigid-flex) |
| PCB materials | FR-4, CEM-3, Rogers, Teflon, high-Tg, ceramic, halogen-free, and more |
| Maximum PCB size | 850 mm × 520 mm |
| Board thickness | 0.2 mm – 8 mm |
| Placement capability | 01005 components; BGA pitch 0.2 mm; QFN, CSP supported |
| Conformal coating board size | Up to 550 mm × 470 mm |
| Order volume | Prototype from 1 piece through medium and large batches |
With these capabilities, Farway serves more than 100 industry customers across more than 20 countries and regions, spanning transportation, new energy, security, medical, communication, and other electronic product fields.
Low pressure molding is a powerful technology, but its value depends heavily on who applies it. A provider that only runs the molding machine cannot catch upstream PCB defects, optimize solder-joint geometry for encapsulation, or verify that the finished assembly passes functional testing under real-world conditions. A provider that only assembles boards may lack the tooling expertise and material knowledge to design an effective overmold.
The ideal partner brings both together: board-level manufacturing competence and encapsulation process expertise, unified under a single quality system. That is precisely the integrated model Farway offers — a low pressure injection molding service china customers can access alongside PCB fabrication, SMT, DIP, coating, testing, and final assembly, all in one Shenzhen facility.
When protection, traceability, and speed-to-market all matter, consolidation is not just convenient — it is a competitive advantage. Every vendor boundary eliminated is one fewer place for quality to slip, documentation to drift, or lead time to grow.
Whether you are developing a waterproof medical sensor, a vibration-resistant automotive control module, or an industrial device that must survive harsh environments, Farway Electronic can take your project from bare board to fully encapsulated, tested, and packaged product — all under one roof in Shenzhen.
Discuss your low pressure molding requirements with Farway's engineering team and receive a rapid quotation tailored to your design.
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