UR5644 Flame Retardant Cloudy/Hazy Polyurethan

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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.


Approvals RoHS Compliant (2015/863/EU): Yes
UL Approval: Meets UL94 V-0
Typical Properties
Liquid Properties: Base Material Polyurethane
Density Part A – Resin (g/ml) 1.14
Density Part B – Hardener (g/ml) 1.13
Part A Viscosity (mPa s @ 23ºC) 300
Part B Viscosity (mPa s @ 23ºC) 4500
Mixed System Viscosity (mPa s @ 23ºC) 1000
Mix Ratio (Weight) 0.75 : 1
Mix Ratio (Volume) 0.75 : 1
Usable Life (20°C) 12 mins
Gel Time (23°C) 25 mins
Cure Time (23 °C) 24 hours
Cure Time (60 °C) 4 hours
Colour Part A – Resin Hazy white
Colour Part B – Hardener Clear
Storage Conditions Dry Conditions: Above 5°C, Below 30°C
Shelf Life 9 months
(Measured on a 100ml sample in a cylinder of diameter 49.4mm @ 23°C)
Shrinkage <1%

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