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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 130°C 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

UR5123 - Thixotropic Polyurethane Resin

UR5123
Thixotropic Polyurethane Resin

Product code: UR5123RP250G - 250G UR5123K5K - 5Kg


UR5123 is a polyurethane potting compound which has been formulated for the specialist protection of units operating in extreme environments such as military, aerospace and automotive electronics. It is an ultra-high performance resin, offering excellent characteristics as well as toughness and tear resistance.

UR5123 is thixotropic allowing the resin flow to be controlled and for more accurate placement. It is designed not to flow through small diameter (1-2mm) holes in PCB's and casings. It also has a low moisture sensitivity allowing for excellent surface cure. Once cured it has very good adhesion to most substrates, and it maintains flexibility to protect delicate components even to temperatures as low as -60°C, while its upper operating temperature is 130°C.

UR5123 is also an ideal choice for marine applications where the electronics will be exposed to fresh or sea water, or even completely submerged as it has a low water absorption and high resistance to water.


Key Properties:
  • Ultra-High Performance
  • Thixotropic - controllable flow
  • High Toughness + tear resistance
  • Good adhesion to most materials
  • Maintains flexibility to -60°C
  • Low water absorption, high resistance to both fresh and sea water;
  • Cure colour : Black
  • RoHS Compliant

Product data sheets
UR5123 (tds) Download

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