Bomar Oligomer Product
UV/EB Oligomer

BR-371B

BR-371B: Difunctional Aliphatic Polyether Urethane Acrylate Oligomer

BR-371B, a low molecular weight, difunctional, aliphatic polyether urethane acrylate oligomer, is a great fit for coatings that require high tensile strength, superior hardness, scratch resistance, and weathering resistance. Formulations with BR-371B yield hard, clear, low-yellowing films. This is a reduced MEHQ version of BR-371S.

Neat Properties
Property Value
Viscosity cP (60ºC) 67,000
Pt-Co (APHA) Color <100
Refractive Index (25ºC) 1.497
Density, g/cm3 (25ºC) 1.10
Monomer Dilution Properties
Value
Property I30 I50 TM50 TP50 H50 HE30
Durometer Hardness 86D 87D 92D 85D 84D 88D
Elastic Modulus (GPa [ksi]) 1,723.7 [250] 1,585.8 [230] 1,999.5 [290] 1,447.9 [210] 1,310.0 [190] 1,723.7 [250]
Elongation (%) 4.3 4.1 2.6 4.2 3.7 4.1
MEK Double Rubs (#) >200 100 >200 >200 >200 >200
Tensile Strength (MPa [psi]) 41.4 [6000] 37.9 [5500] 38.6 [5600] 31.0 [4500] 31.7 [4600] 37.9 [5500]
Water Absorption (%) 24hrs 0.21 0.15 0.25 0.31 0.24 0.76
Viscosity (cP) 42,000 @ 25ºC 1,900 @ 25ºC 12,000 @ 25ºC 1,900 @ 25ºC 500 @ 25ºC 5,500 @ 25ºC

Features

  • High tensile strength
  • Superior hardness
  • Excellent adhesion to plastics
  • Low color
  • Fast cure speeds
  • Optical clarity

Applications

  • Wood coatings
  • Rigid plastic coatings
  • Hard gel nail coatings
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