UR5528 Black Polyurethane Resin

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UR5528 is a black, two part polyurethane potting and encapsulation compound with excellent chemical resistance suitable for a wide variety of applications.

Its excellent water resistance properties make it a good choice for marine electronics, or where moisture ingress is a potential issue while it is also a tough and durable resin offering physical protection.

Its excellent adhesion to a wide range of substrates makes it very versatile option, with low viscosity easing the potting or encapsulation process.


Approvals RoHS Compliant (2015/863/EU): Yes
UL Approval: No
Typical Properties
Liquid Properties: Base Material Polyurethane
Density Part A – Resin (g/ml) 1.02
Density Part B – Hardener (g/ml) 1.24
Part A Viscosity (mPa s @ 23ºC) 3500
Part B Viscosity (mPa s @ 23ºC) 150
Mixed System Viscosity (mPa s @ 23ºC) 2000
Mix Ratio (Weight) 2.37:1
Mix Ratio (Volume) 2.87:1
Usable Life (20°C) 20 mins
Gel Time (23°C) 35 mins
Cure Time (23 °C) 24 hours
Cure Time (60 °C) 5 hours
Colour Part A – Resin Black
Colour Part B – Hardener Amber
Storage Conditions Dry Conditions: Above 15ºC, Below 30ºC
Shelf Life 12 months
(Measured on 100ml sample; cylinder of diameter 49.4mm @ 23ºC) < 35ºC
Shrinkage < 1%

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