Bomar Oligomer Product
UV/EB Oligomer

BR-641E

BR-641E: Difunctional Aliphatic Polybutadiene Urethane Acrylate Oligomer

BR-641E is a polybutadiene urethane acrylate oligomer designed for rigorous electronic coating, flexible ink, and pressure-sensitive adhesive applications. This oligomer is also perfect for extremely low water absorption applications. It is resistant to thermal cycling and can withstand the temperature extremes typical of such tests without undue degradation of properties.

Neat Properties
Property Value
Viscosity cP (60ºC) 25,000
Pt-Co (APHA) Color 20
Refractive Index (25ºC) 1.477
Density, g/cm3 (25ºC) 0.88
Monomer Dilution Properties
Value
Property I30 I50 TM50 TP50 H50 HE30
Durometer Hardness 42A 60A
Elastic Modulus (GPa [ksi]) 0.5 [0.07] 1.5 [0.22]
Elongation (%) 85 400
MEK Double Rubs (#) 32 12
Tensile Strength (MPa [psi]) 0.3 [50] 2.4 [350]
Water Absorption (%) 24hrs 0.02 0.03
Viscosity (cP) 16,000 @ 25ºC 2,600 @ 25ºC ‖ @ 25ºC ‖ @ 25ºC ‖ @ 25ºC ‖ @ 25ºC

Features

  • Excellent flexibility
  • High temperature resistance
  • Excellent chemical resistance
  • Very low moisture absorption
  • Thermal cycling capability

Applications

  • Electronics coatings
  • Flexible inks
  • Pressure-sensitive adhesives
Back to top