Electrolube 5041

UR5041 water resistant polyurethane potting compound is a two-part black encapsulation and potting compound formulated to perform to the highest levels.

Electrolube 5041

Electrolube UR5041 is a two-part, ultra-high-performance resin system which features excellent resistance to seawater and low water absorption.

  • Excellent resistance to sea water; ideal for marine environments
  • Good low-temperature performance; suitable for use down to -60°C
  • High toughness and tear resistance; offers good physical protection
  • Excellent oxidation resistance; high performance in a range of challenging environments


  • Excellent resistance to sea water
  • High toughness and tear resistance
  • Good adhesion to most substrates
  • Properties retained at temperatures down to -60°C
  • RoHS Compliant


Resin Packs

When in Resin pack form, the resin and hardener are mixed by removing the clip and moving the contents around inside the pack until thoroughly mixed. To remove the clip, remove both end caps, grip each end of the pack and pull apart gently. By using the removed clip, take special care to push unmixed material from the corners of the pack. Mixing normally takes from three to four minutes depending on the skill of the operator and the size of the pack. Both the resin and hardener are evacuated prior to packing so the system is ready for use immediately after mixing. The corner may be cut from the pack so that it may be used as a simple dispenser. There is also a YouTube video (Polyurethane Mixing Instructions) available on the Electrolube channel to show the mixing process.

Bulk Mixing

When mixing, care must be taken to avoid the introduction of excessive amounts of air. Automatic mixing equipment is available which will not only mix both the resin and hardener accurately in the correct ratio but do this without introducing air. Containers of Part A (Resin) and Part B (Hardener) should be kept sealed at all times when not in use to prevent the ingress of moisture. Bulk material must be thoroughly mixed before use. Incomplete mixing or use of the wrong mix ratio will result in erratic or partial curing.

Typical Properties

Liquid Properties:

  • Base Material
    • Polyurethane
  • Density Part A – Resin (g/ml)
    • 1.17
  • Density Part B – Hardener (g/ml)
    • 1.24
  • Part A Viscosity (mPa s @ 23oC)
    • 9300
  • Part B Viscosity (mPa s @ 23oC)
    • 55
  • Mixed System Viscosity (mPa s @ 23oC)
    • 2500
  • Mix Ratio (Weight)
    • 3.64:1
  • Mix Ratio (Volume)
    • 3.85:1
  • Usable Life (20°C)
    • 20 mins
  • Gel Time (23°C)
    • 60 mins
  • Cure Time (23 °C)
    • 24 hours
  • Cure Time (60 °C)
    • 4 hours
  • Colour Part A – Resin
    • Black
  • Colour Part B – Hardener
    • Amber
  • Storage Conditions
    • Dry Conditions: Above 15ºC, Below 30ºC
  • Shelf Life
    •  12 Months
  • Exotherm (Measured on 100ml sample in a cylinder of diameter 49.4mm @ 23oC)
    • < 50ºC
  • Shrinkage
    • < 0.5%


It is far easier for machines & containers to be cleaned before the resin has been allowed to cure. Electrolube’s RRS is suitable for cleaning machines and containers and cured resin may be slowly softened and removed by soaking in our RRS.


Do not heat cure large volumes immediately. Allow these to gel at room temperature and post-cure at high temperature if required (refer to liquid properties for details). Small volumes (250ml) may be heat cured immediately.


When storing under very cold conditions, the hardener may crystallise. If this occurs, simply warm (40°C) the container gently until all crystals have re-melted.

Health & Safety

Always refer to the Health & Safety data sheet before use. These can be downloaded from www.electrolube.com


To request any type of technical sheet or safety sheet.

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