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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

UR5634 - Optically Clear Polyurethane Resin

UR5634
Optically Clear Polyurethane Resin

250g Resin Pack - 5 Kg Kit - 25kg

Product code: UR5634RP250G - UR5634K5K - UR5634K25K


A two-part, semi-rigid polyurethane resin which is a carefully selected blend of components specifically formulated to be optically clear, making it ideal for LED encapsulation or potting. Its water-white transparency makes it an excellent choice for use in both decorative and protective applications in the LED luminaires industry.

It exhibits superb weather resistance, as well as good resistance to acids and alkalis making it suitable for a wide range of environments and an extremely durable potting and encapsulation compound for use in a wide range of applications.

It is also strongly resistant to yellowing when exposed to UV light making it especially useful as an outdoor LED encapsulant or for use in other applications where it may be exposed to direct sunlight.

For Full product specs please see the TDS link below.


Key Properties:
  • Extremely durable, low viscosity system.
  • Can be used for a wide variety of applications.
  • Water white transparency; ideal for LED encapsulation.
  • 1:1 by volume mix ratio; aids ease of processing.
  • Does not contain IPDI; low hazard material.
  • High resistance to weather/UV, acids and alkalis, water and mould growth.
  • RoHS Compliant


Product data sheets
UR5634 (tds) Download

Log into our MSDS database for Safety Data Sheets: MSDS