Colorless clear and rigid PU doming and coating

       Colorless clear and rigid PU doming and coating              INTRODUCTION                                                                   PU-245 is a two-component, colorless clear, rigid, low viscosity, fast cure liquid polyurethane resin; it has excellent UV and yellow resistance property, weather resistant and anti-aging, form a bright crystal clear and smooth surface after cured. It is widely used in crafts making, doming, casting, encapsulation, potting, and non-yellowing coating and so on.   UNCURED PROPERTIES                                                          

Item	PU-245A	PU-245B
Appearance	Colorless clear liquid	Colorless to yellowish liquid
Viscosity cps/25°C	400 ±100	250 ± 50
Shelf life (month)	6	6
Mixing Ration (by weight)	A:B=1:1
Pot Life (at 25°C)	40min (for 200g mixture)
Cure condition	30°C×20h or 60°C×3h

  CURED PROPERTIES                                                              

Item	PU-245
Appearance	Transparent and rigid
Hardness (Shore D)	80±5
Tensile strength (Mpa)	2
Elongation (%)	200
Volume resistivity (ohm-cm)	>1015

  OPERATION DETAILS                                                            It is very important to maintain the humidity of the operating environment. We recommend please do the operation as follow. Pre-Processingthe base material which need to doming/potting/coating: put it into the 60°C oven to remove the moisture on the surface. Keep the container clean and dry which used to mixing the adhesive. Take the correct mix ratio amount of part A and part B, A:B=1:1 (by weight). Stir the mixture uniformly, and then do the operation of take off the gas immediately (use the vacuum pump to de-foaming), until there is no bubble on the surface of liquid. Please use up the mixture within the operation time, the more quantity of mixing, the less operation time. The operation of potting/doming: don’t potting in a high height, don’t potting in many different areas, just take a standpoint and potting the glue slowly. Doming: use clean needle to doming. If use the tube package product, just connect the mixing tube and doming, the usual thickness is about 2mm, observe the surface within 5min after doming, use the needle to remove the small bubbles if there have. Curing condition and time: 30°C×20h or 60°C×3h. During curing, please keep the environments cleaning to avoid the dirt dropping into the uncured glue. It is very important to seal the part A and part B well after use. And please take the basic protective measures when operation.