Bomar Oligomer Product
UV/EB Oligomer

BR-571

BR-571: Difunctional Aliphatic Polyether Urethane Acrylate Oligomer

BR-571 is an aliphatic polyether urethane diacrylate with exceptionally low color. Based on a stable polyether backbone, BR-571 offers excellent physical properties in formulated films. While relatively high in neat viscosity, BR-571 reduces quickly with the addition of heat or monomer. Formulations using BR-571 often have a unique blend of toughness and flexibility.

Neat Properties
Property Value
Viscosity cP (60ºC) 31,000
Pt-Co (APHA) Color 20
Refractive Index (25ºC) 1.494
Density, g/cm3 (25ºC) 1.08
Monomer Dilution Properties
Value
Property I30 I50 TM50 TP50 H50 HE30
Durometer Hardness 64D 75D 80D 68D 71D 60D
Elastic Modulus (GPa [ksi]) 310.3 [45] 965.3 [140] 1,172.1 [170] 482.6 [70] 620.5 [90] 137.9 [20]
Elongation (%) 75 40 3.1 10.6 5.5 80
MEK Double Rubs (#) 75 25 >200 92 130 23
Tensile Strength (MPa [psi]) 23.4 [3400] 19.3 [2800] 31.7 [4600] 16.5 [2400] 19.3 [2800] 15.9 [2300]
Water Absorption (%) 24hrs 0.5 0.35 0.7 0.8 0.66 2.74
Viscosity (cP) 34,000 @ 25ºC 3,000 @ 25ºC 15,000 @ 25ºC 2,800 @ 25ºC 1,000 @ 25ºC 9,800 @ 25ºC

Features

  • Improves solvent resistance
  • Enhances toughness
  • Improves weatherability
  • Gloss finish
  • Provides hardness
  • Exceptionally low color
  • Exhibits hydrolytic stability

Applications

  • Coatings for wood
  • Pigmented coatings
  • Rigid plastic topcoats
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