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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

UR5044 - Dark Blue Polyurethane Resin

UR5044
Dark Blue Polyurethane Resin

250g - 1KG - 5KG - 10KG - 25KG

Product code: UR5044RP250G - UR5044K1K - UR5044K5K - UR5044K10K - UR5044K25K


UR5044 is a UL94 approved two part Polyurethane resin system, which when cured has a dark blue finish. It is a high performance resin system for use in a range of potting and encapsulation applications.

Its flexibility and its digoutable characteristics make it an ideal compound for use in prototype electronics, or potted units which may require rework or repair within their life cycle. Its excellent flexibility is maintained even at temperature extremes, and this combined with its other attributes makes it a good alternative to silicone resin systems.

For Full product data, please see the TDS link below.


Key Properties:
  • Flame retardant, certified to UL94 V-0
  • Soft, re-workable resin
  • Flexible even at temperature extremes
  • Excellent low temperature performance to -70 °C
  • Ideal for prototype circuitry, silicone replacement, and control units
  • RoHS Compliant

Product data sheets
UR5044 (tds) Download

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