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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

UR5528 - Black Polyurethane Resin

UR5528
Black Polyurethane Resin

50g - 250g - 5KG

Product code: UR5528RP50G - UR5528RP250G - UR5528K5K


UR5528 is a black, two part polyurethane potting and encapsulation compound with excellent chemical resistance suitable for a wide variety of applications.

Its excellent water resistance properties make it a good choice for marine electronics, or where moisture ingress is a potential issue while it is also a tough and durable resin offering physical protection.

Its excellent adhesion to a wide range of substrates makes it very versatile option, with low viscosity easing the potting or encapsulation process.


Key Properties:
  • Durable with a high degree of toughness
  • Excellent adhesion to a wide variety of substrates
  • Low viscosity allowing ease of application
  • Excellent resistance to acids, alkalis and other aqueous materials
  • RoHS Compliant

Product data sheets
UR5528 (tds) Download

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