UR5638

PROVISIONAL TDS UR5638 Polyurethane Resin UR5638 is a two-part, soft optically clear polyurethane resin ideal for use in protective applications. Due to a carefully selected blend of components an extremely durable medium viscosity system is achieved which can be used for a wide variety of applications. Water white transparency ideal for LED applications 3.7:1 mix ratio Does not contain IPDI low hazard material High resistance to weather/UV, acids and alkalis, water and mould growth suitable for a range of environments Approvals RoHS-2 Compliant (2011/65/EU): Yes UL Approval: No Typical Properties Liquid Properties: Base Material Polyurethane Density Part A - Resin (g/ml) 0.99 Density Part B - Hardener (g/ml) 1.16 Part A Viscosity (mPa s 23C) 775 Part B Viscosity (mPa s 23C) 1200 Mixed System Viscosity (mPa s 23C) 2000 Mix Ratio (Weight) 3.73:1 Mix Ratio (Volume) 4.42:1 Usable Life (20C) ~50 mins Gel Time (23C) ~100 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 15C, Below 35C Shelf Life 12 months < 1% Shrinkage Refractive Index 1.481 Cured System: Thermal Conductivity (W/m.K) 0.20 Cured Density (g/ml) 1.11 Temperature Range (C) -40 to +120 Max Temperature Range (Short Term (C)/30 mins) +130 (Application and Geometry Dependent) Dielectric Strength (kV/mm) 11 14 Volume Resistivity (ohm-cm) 10 Shore Hardness A45 Colour (Mixed System) Water White Flame Retardancy No Loss Tangent 50 Hz 0.025 Permittivity 50 Hz 3.50 Comparative Tracking Index Not Measured Water Absorption (9.7mm thick disk, 51mm diameter) < 1% / < 1% 10 days 20C / 1 hour 100C Elongation At Break 50% Mixing Procedures 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 two 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. 1 3 2 5 6 4