UR5640 Optically Clear Polyurethane Resin

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UR5640 is an optically clear resin making it ideal for LED encapsulation, suitable for aesthetic as well as protective application over the top of the luminaire. Due to the aliphatic chemical nature of the resin chemistry, the cured UR5640 is naturally resistant to the yellowing effects of UV light, making it useful for a range of outdoor applications. UR5640 shows excellent weather resistance, as well as chemical resistance against a range of chemicals. This enables this clear, though yet flexible resin to be used in a range of applications, both indoor or out.


Approvals RoHS Compliant (2015/863/EU): Yes
UL Approval: No
Typical Properties
Liquid Properties: Base Material Polyurethane
Density Part A – Resin (g/ml) 1.03
Density Part B – Hardener (g/ml) 1.12
Part A Viscosity (mPa s @ 23ºC) 700
Part B Viscosity (mPa s @ 23ºC) 1200
Mixed System Viscosity (mPa s @ 23ºC) 900
Mix Ratio (Weight) 1.27 : 1
Mix Ratio (Volume) 1.44 : 1
Usable Life (20°C) 17 mins
Gel Time (23°C) 21 mins
Cure Time (23 °C) 24 hours
Cure Time (60 °C) 4 hour
Colour Part A – Resin Clear
Colour Part B – Hardener Clear
Storage Conditions Dry Conditions: Above 5°C, Below 30°C
Shelf Life 12 months
(Measured on a 100ml sample in a cylinder of diameter 49.4mm @ 23°C) <90°C
Shrinkage <1%

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