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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

UR5644 - Flame Retardant Cloudy/Hazy Polyurethan

UR5644
Flame Retardant Cloudy/Hazy Polyurethan

250g - 5Kg

Product code: UR5644RP250G - UR5644K5K


UR5644 is a flame retardant polyurethane resin / potting compound which has a hazy, light defusing effect ideal for potting LEDs. It is flame retardant and will pass UL94 V-0 (approval pending) making it an excellent choice for LEDs used in Hazardous or ATEX areas giving a softer light than the optically clear UR5641 while still offering excellent levels of protection. UR5644 is based on the same halogen free aliphatic chemistry as UR5641, offering resistance to the yellowing effects of UV light as well as good chemical resistance while allowing the transfer of the majority of RF radio frequencies with the minimal of scattering.

UR5644 has good adhesion to a wide range of substrates meaning it can be used to encapsulate any number of components that require a high level of flame retardantcy while it also offers good chemical resistance and low water absorption.


Key Properties:
  • Hazy Light Diffusing Effect
  • Flame retardant UL94 V-0 (pending)
  • Resistant to UV yellowing
  • Excellent for the protection of LED's in hazardous environments
  • Halogen free
  • Good Adhesion
  • Good Chemical resistance
  • RoHS Compliant

Product data sheets
UR5644 (tds) Download

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