Bomar Oligomer Product
UV/EB Oligomer

BR-5541MD

BR-5541MD: Difunctional Aliphatic Polyether Urethane Methacrylate

BR-5541MD is a flexible polyether urethane methacrylate oligomer diluted in 20% IBOMA with a low modulus, good adhesion to a variety of substrates, and excellent elasticity. The high molecular weight of the backbone structure offers improved elasticity and rebound versus similar high elongation materials. The low modulus of the material allows for a high degree of flexibility comparable to silicone-based materials. The compressibility of the material also offers potential usage in gasket and sealing applications.

Neat Properties
Property Value
Viscosity cP (60ºC) 29,000
Pt-Co (APHA) Color 17
Refractive Index (25ºC) 1.47
Density, g/cm3 (25ºC) 1.00
Monomer Dilution Properties
Value
Property I30 I50 TM50 TP50 H50 HE30
Tensile Strength (MPa [psi]) 6.5 [940] 24.1 [3500] 22.1 [3200] 11.7 [1700] 13.8 [2000] 0.5 [75]
Elongation (%) 380 440 4.4 16.8 8.6 250
Elastic Modulus (MPa [ksi]) 2.3 [0.34] 103.4 [15] 758.4 [110] 275.8 [40] 344.7 [50] 0.7 [0.10]
Durometer Hardness 45A 69A 76D 58D 65D 70A
Water Absorption (%) 24hrs 0.43 0.28 0.63 0.57 0.46 1.79
MEK Double Rubs (#) 42 20 >200 17 175 30
Viscosity (cP) 19,000 @ 25ºC 4,200 @ 25ºC 14,000 @ 25ºC 5,000 @ 25ºC 3,000 @ 25ºC 15,000 @ 25ºC

** Tensile Properties per ASTM D882   - Not Tested   || Incompatible   X Unable to Measure

Features

  • High elongation
  • Low modulus for soft resin applications
  • Good surface cure
  • Excellent elasticity/rebound
  • Improved tear strength
  • Adhesion to a variety of substrates

Applications

  • Plastic bonding adhesives
  • Cure-in-place gaskets and sealants
  • Flexible 3D printing resins
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