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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

UR5641 - Optically Clear Flame Retardant Polyurethane

UR5641
Optically Clear Flame Retardant Polyurethane

250g - 5kg

Product code: UR5641RP250G - UR5641K5K


UR5641 is an optically clear flexible polyurethane resin, with the added bonus of having excellent flame retardant properties. Due to its exceptional properties it makes it suitable for the protection of LED luminaires which are located in hazardous environments. The resin system is based on halogen free aliphatic chemistry ensuring that cured UR5641 is resistant to the yellowing effects of UV light, making it useful in exterior as well as interior applications.


Key Properties:
  • Water white transparency
  • Flame retardant
  • Resistant to UV yellowing
  • Excellent for the protection of LED's in hazardous environments
  • Halogen free
  • RoHS Compliant

Product data sheets
UR5641 (tds) Download

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