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Polyurethane Potting Compounds

Electrolube resins in use.
  • Good flexibility, even at low temperatures
  • Ideal for delicate components
  • Good for complex geometries
  • Exceptionally wide range of hardness options available
  • Good to excellent water resistance

Electrolube Polyurethane resins are specialist systems for potting and encapsulating printed circuit boards (PCBs), electronic components and devices. Polyurethane resin systems are designed to insulate the device from harsh environments acting as a barrier against contaminates such as moisture, chemicals and protection against physical shock and vibrations.

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Polyurethane encapsulants offer several advantages over epoxies and silicones. They provide chemical, dust and moisture resistance, as well as exhibiting excellent electrical resistance and flexibility. They also have good adhesion to most substrates, both metal and plastic.

Due to the nature of the urethane bond, in general it is recommended that a maximum continuous service temperature of 130C is observed.

Polyurethane resins generally have much faster cure times than epoxies and exhibit more flexibility and a wider range of shore hardness. Due to their elastomeric or rubbery state when cured, polyurethane resins are often the preferred choice when the electronics being potted which contain delicate components. This has led to wide a wide range of applications in the automotive and home appliance industries and increasingly polyurethane resins are being used as LED potting compounds for internal and external lighting applications.

Traditionally polyurethane resins can demonstrate a lower water resistance, especially at high temperatures, however Electrolube offer a range of products formulated especially for water resistance and are well suited to the automotive and marine industries. Similar to epoxies, the polyurethane resins usually come in two component systems, but usually display lower exotherm during the cure process, even with the faster curing systems.

Basic Key Properties:

  • Good flexibility, even at low temperatures
  • Ideal for delicate components
  • Good for complex geometries
  • Exceptionally wide range of hardness options available
  • Good to excellent water resistance

For More details on the Chemistry of Polyurethane resins, have a look at our knowledge centre articles below:

Encapsulation Resins

Polyurethane Potting Compound

UR5083 - Clear Straw Polyurethane Resin

UR5083
Clear Straw Polyurethane Resin

1K - 5K - 250g resin pack - 500g resin pack

Product code: UR5083RP500G - UR5083RP250G - UR5083K5K - UR5083K1K - UR5083B5K - UR5083AB5K


UR5083 is a very high performance resin system that has the unique ability to "self heal" if penetrated. This makes a good choice for applications such as cabling and wiring where connectors or components require passing through the resin itself after application. Another benefit of this is that testing can also be done through the resin itself.

The resin adheres to the case or electronic device, while sliding off the test probe, wire or connector as it is removed, closing the up behind as it is removed and providing a barrier to moisture. These properties make it ideal for electronics encapsulation for marine applications or submerged units such as underwater cabling.

Its long useable life also makes it a good choice for potting complex PCB geometry.


Key Properties:
  • Self-healing polyurethane gel
  • Low viscosity
  • Excellent water resistance
  • Excellent electrical properties
  • Good moisture resistance during cure.
  • Long useable life
  • RoHS Compliant

Product data sheets
UR5083 (tds) Download

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