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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

UR5125 - High Temperature Polyurethane Resin.

UR5125
High Temperature Polyurethane Resin.

250G Pack - 5Kg Kit

Product code: UR5125RP250G - UR5125K5K


UR5125 is a two-part polyurethane encapsulation resin that has been primarily developed for encapsulation of electrical components that require high temperature performance. UR5125 has a wide operating temperature range, (-60°C to +150°C) with the flexibility of a polyurethane to allow changes in temperature that afford identical levels of protection to the potted component or unit. It has excellent resistance to salt water, making it an ideal choice for marine applications such as underwater sensors or other seaborne electronics exposed to the elements and its flexibility allows resistance to low temperatures which may be associated with underwater applications.

UR5125 is also highly resistant to most chemicals lending itself to a multitude of applications in the Automotive or Aerospace industries as well as the marine environments.


Key Properties:
  • Excellent high temperature performance;
  • operating temperatures -60°C +150°C
  • Excellent resistance to sea water and good chemical resistance
  • Excellent adhesion to a wide range of substrates
  • Good flexibility even at low temperatures
  • Black Potting Compound / Encapsulant
  • RoHS Compliant

Product data sheets
UR5125 (tds) Download

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