Low Pressure Molding (LPM), also known as Low Pressure Injection Molding, is a process used to mold and protect electronic components such as printed circuit boards (PCBs), sensors, and connectors from vibrations, shocks, and harsh environments. The LPM process utilizes melted plastic material, injected into a mold cavity at relatively low pressures (1.5 to 40 bar or 21.8 to 580 psi), making it ideal for sensitive electronics.

1. Low Pressure Molding Process

Compared to traditional injection molding or potting, Low Pressure Molding simplifies the manufacturing process into three key steps:

Step 1: Insert

• The electronic components or parts to be encapsulated are inserted into the mold cavity.
• This step typically takes 5-10 seconds.

Step 2: Overmolding

• The LPM machine injects melted material into the mold at low pressure.
• The material flows around and encapsulates the components.
• The process takes 15-60 seconds.

Step 3: Cooling and Ejection

• The molded part cools and solidifies.
• Once cooled, the part is ejected and immediately ready for handling and testing.

2. Applications of Low Pressure Molding

As electronic components become more compact and powerful, encapsulation technologies like LPM play a crucial role in ensuring durability. LPM has become a widely adopted manufacturing technique across multiple industries.

Automotive Industry

LPM is used in manufacturing:

• Sensors
• Wiring harnesses
• Micro switches
• Interior components

LPM’s ability to mold complex shapes and large parts makes it an ideal choice for automotive components.

Electronics

LPM is particularly suited for delicate electronic components such as:

• PCBs
• Sensors
• Connectors
• Cables

The low pressure minimizes the risk of damage during encapsulation, ensuring reliable and high-quality products.

Medical Devices

LPM is widely used in medical applications due to its ability to create complex, precise, and biocompatible components. Common applications include:

• Medical electronics
• Diagnostic devices
• Medical catheter sealing

Custom Goods

LPM’s versatility allows for the production of intricate details and large-scale components, making it a preferred method in consumer goods industries such as:

• Toys
• Household items
• Home appliances