UR5639 Flexible Polyurethane Resin

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UR5639 is a flexible polyurethane resin designed primarily as an LED encapsulant, although its flexibility makes it suitable for a range of applications where delicate components are present. It has low exotherm while curing, and low viscosity which aids the potting process.

It has excellent UV stability and a optically clear finish making it an excellent choice for both indoor and outdoor LED applications.


Approvals RoHS Compliant (2015/863/EU): Yes
UL Approval: No
Typical Properties
Liquid Properties: Base Material Polyurethane
Density Part A – Resin (g/ml) 0.96
Density Part B – Hardener (g/ml) 1.16
Part A Viscosity (mPa s @ 23ºC) 1690
Part A Viscosity (mPa s @ 35ºC) 804
Part B Viscosity (mPa s @ 23ºC) 700
Mixed System Viscosity (mPa s @ 23ºC) 1300
Mix Ratio (Weight) 2:1
Mix Ratio (Volume) 2.38:1
Usable Life (20°C) ~25 mins
Gel Time (23°C) ~34 mins
Cure Time (23 °C) 24 hours
Cure Time (60 °C) 4 hours
Colour Part A – Resin Clear
Colour Part B – Hardener Clear
Storage Conditions Dry Conditions: Above 5ºC, Below 30ºC
Shelf Life 12 months
Shrinkage < 1%

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