URASET™ UB-21

URASET™ UB-21

FLEXIBLE URETHANE ADHESIVE

URASET™ UB-21

UB-21 is a clear, two-part urethane resin system, which combines good handling characteristics with excellent cured properties. Its low viscosity allows good flowability and air release. The cured elastomer has excellent bond to metals, ceramics, and many plastics used in medical industry such as acrylic, polycarbonate, PVC etc. They also have excellent water resistance and are exceptionally resistant to thermal shock. They can be used as an adhesive or for potting, casting and encapsulating applications.

Product Specifications

No.of Components 2
Mix Ratio by Weight 58.3/100
Mixed Viscosity @RT(cps) 750-850
Pot Life @25°C(100 gram) 100-140
Recommended Cure Gel @ 25°C + 2 hr @ 100°C
Alternate Cure 2-3 days @ 25°C
Color Light Clear Yellow
Specific Gravity 1.1
Hardness(Shore) A-88
Refractive Index
Lap Shear Strength @25°C(psi) 1280
Tg(°C)
CTE(Below Tg)10-6/°C
Service Temp.Range 55°C-125°C
Thermal Conductivity(W/m°K) NA
Volume Resistivity(500 V) 2x10^13

Features & Applications:

  • Kerf filling
  • Connector seal
  • Flowable liquid
  • Semi-Rigid cured polymer
  • Fast cure time

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