Low Pressure Molding (LPM) Guide
How to Achieve IP68 Waterproofing Without Compromising Production Efficiency

As modern electronics continue to demand lighter weight, higher integration, and superior protection, Low Pressure Molding (LPM) has rapidly emerged as a preferred alternative to traditional potting and high-pressure injection molding.

From automotive sensors and wearable devices to industrial connectors, LPM enables robust sealing and insulation—without damaging sensitive electronic components.

This guide addresses key engineering and procurement concerns, while outlining how Fullglory Technology helps transform LPM into a scalable, production-ready solution.

Q1: What Is Low Pressure Molding (LPM), and How Does It Differ from Traditional Injection Molding?

Low Pressure Molding (LPM) is an encapsulation process that uses hot-melt materials—typically polyamide (PA) or polyolefin (PO)—injected at very low pressure (2–40 bar).

Compared to conventional plastic injection molding (often exceeding 500 bar), LPM operates under:

• Lower pressure → protects delicate PCB components
• Moderate temperature → reduces thermal stress
• Gentle flow behavior → minimizes mechanical impact

A key advantage of LPM is that it combines housing formation and encapsulation into a single step, eliminating secondary potting processes and reducing product size.

With extensive mold development experience, Fullglory precisely controls injection pressure, flow rate, and material behavior—ensuring zero damage, high yield, and consistent quality during encapsulation.

Q2: Why Is LPM Ideal for Waterproof Connectors and Sensors?

Traditional potting processes often require long curing times and may introduce air bubbles that compromise sealing performance.

In contrast, LPM delivers immediate and reliable protection with several key advantages:

• Integrated IP67 / IP68 sealing — no secondary sealing process required
• Excellent strain relief — protects cable-to-connector interfaces from mechanical stress
• Environmentally compliant materials — typically RoHS & REACH compliant, with recyclable waste

Fullglory’s LPM waterproof connector solutions are engineered for demanding environments such as automotive electronics, outdoor surveillance, and industrial systems.

Using high-performance hot-melt materials, our solutions maintain stable adhesion and mechanical integrity even under extreme temperatures ranging from -40°C to 150°C.

Q3: What Are the Common Challenges in LPM Production?

Despite its advantages, LPM production presents several technical challenges:

1. Material adhesion issues
Different cable jackets (e.g., PVC, Teflon) may not bond effectively with LPM materials.

2. Flashing or short shots
Improper mold design or pressure control can lead to defects.

3. Cycle time optimization
Balancing cooling efficiency with part quality is critical for mass production.

Fullglory addresses these challenges through a system-level engineering approach, including:

• Material compatibility testing (adhesion testing)
• Advanced mold flow simulation
• Process optimization for automated production

By resolving risks early in the design phase, we help customers shorten NPI timelines and ensure smooth mass production.

Q4: What Are Fullglory’s Advantages in Custom LPM Solutions?

LPM is not just about equipment—it requires deep integration of materials, tooling, and process parameters.

Fullglory’s core strengths include:

• In-house mold development
We understand LPM-specific shrinkage behavior, enabling precise mold design for optimal fit and demolding performance.

• Cross-industry experience
Serving medical devices, automotive electronics, and industrial systems requiring high durability and reliability.

• Integrated connector + cable + LPM solutions
We combine our own cable assemblies with LPM encapsulation to deliver fully tested, ready-to-use products.

For projects focused on weight reduction, higher protection levels, or assembly efficiency, Fullglory is your trusted engineering partner.

LPM Is Not Just a Process — It’s a Competitive Advantage

From precision sensors to rugged industrial connectors, LPM is redefining how electronic products are designed and protected.

With Fullglory’s expertise, LPM becomes more than a manufacturing process—it becomes a strategic advantage in product performance, reliability, and time-to-market.

Not sure if LPM is right for your product?

Share your design drawings or application requirements with us—our engineering team will provide custom feasibility evaluation and rapid prototyping support.