Bomar Oligomer Product
UV/EB Oligomer

BR-5541M

BR-5541M: Difunctional Aliphatic Polyether Urethane Methacrylate Oligomer

BR-5541M is a flexible polyether urethane methacrylate oligomer diluted in 20% IBOA 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 such as BRS-14320S, but with improved compatibility and surface cure. The compressibility of the material also offers potential usage in gasket and sealing applications.

Neat Properties
Property Value
Viscosity cP (60ºC) 24,000
Pt-Co (APHA) Color 20
Refractive Index (25ºC) 1.47
Density, g/cm3 (25ºC) 1.00
Monomer Dilution Properties
Value
Property I30 I50 TM50 TP50 H50 HE30
Durometer Hardness 53A 30D 76D 59D 62D 71A
Elastic Modulus (GPa [ksi]) 3.0 [0.43] 37.2 [5.4] 689.5 [100] 275.8 [40] 344.7 [50] 5.4 [0.79]
Elongation (%) 270 400 4 15.7 10.3 400
MEK Double Rubs (#) 60 19 >200 30 57 35
Tensile Strength (MPa [psi]) 3.0 [440] 15.9 [2300] 19.3 [2800] 11.0 [1600] 15.2 [2200] 6.9 [1000]
Water Absorption (%) 24hrs 0.52 0.24 0.75 0.66 0.55 2.98
Viscosity (cP) 23,000 @ 25ºC 4,800 @ 25ºC 15,000 @ 25ºC 5,600 @ 25ºC 3,400 @ 25ºC 18,000 @ 25ºC

Features

  • High elongation
  • Low modulus for soft resin applications
  • Good surface cure
  • Excellent elasticity/rebound
  • Adhesion to a variety of substrates, mainly plastics but also glass and metal
  • Improved tear strength

Applications

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