Bomar Oligomer Product
UV/EB Oligomer

BR-741

BR-741: Hexafunctional Aliphatic Urethane Acrylate Oligomer

BR-741 is a low molecular weight, difunctional, aliphatic polyester urethane acrylate that can be effectively formulated for adhesion to steel, aluminum, and various plastics with some amount of surface energy. The resulting hard, tough film makes an effective protective coating, which will be non-yellowing, due to the aliphatic backbone of BR-741.

Neat Properties
Property Value
Viscosity cP (60ºC) 74,000
Pt-Co (APHA) Color 40
Refractive Index (25ºC) 1.494
Density, g/cm3 (25ºC) 1.1
Monomer Dilution Properties
Value
Property I30 I50 TM50 TP50 H50 HE30
Durometer Hardness 59D 83D >95D 81D 83D
Elastic Modulus (GPa [ksi]) 2,689.0 [390] 2,344.2 [340] 2,895.8 [420] 2,551.1 [370] 2,275.3 [330]
Elongation (%) 10 3 1.2 3 1.8
MEK Double Rubs (#) 35 13 >200 175 >200
Tensile Strength (MPa [psi]) 63.4 [9200] 51.0 [7400] 26.2 [3800] 37.2 [5400] 31.0 [4500]
Water Absorption (%) 24hrs
Viscosity (cP) 34,000 @ 25ºC 1,900 @ 25ºC 8,700 @ 25ºC 1,100 @ 25ºC 800 @ 25ºC — @ 25ºC

Features

  • Improves adhesion
  • Enhances hardness
  • Non-yellowing
  • Develops weatherability
  • Provides abrasion resistance
  • Gloss finish

Applications

  • Coatings for metal
  • Coatings for plastic
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