Bomar Oligomer Product
UV/EB Oligomer

BR-581MT

BR-581MT: Difunctional Aliphatic Tack-Free Topcoat Oligomer

BR-581MT is an oligomer blend that provides a low color, tack-free cure under low-intensity LED cure conditions. BR-581MT provides a balance of hardness and flexibility for abrasion resistance on flexible substrates, while also yielding a high-gloss, non-yellowing finish. This product is a resin blend containing 25% DEGDMA, is tin-free, is fully INCI listed, and can be formulated into a tack-free top coat for nail gel applications. For further recommendations on formulating for nail applications, please see our sell sheet for a starting point formula.

Neat Properties
Property Value
Viscosity cP (25ºC) 8,000
Pt-Co (APHA) Color 35
Refractive Index (25ºC)
Density, g/cm3 (25ºC)
Monomer Dilution Properties
Value
Property I30 I50 TM50 TP50 H50 HE30
Durometer Hardness 42D 66D 87D D64 D78
Elastic Modulus (GPa [ksi]) 19.3 [2.8] 172.4 [25] 2,413.2 [350] 206.8 [30] 965.3 [140]
Elongation (%) 50 70 1.7 24 10.5
MEK Double Rubs (#) 12 6 >200 65 >200
Tensile Strength (MPa [psi]) 1.9 [270] 4.1 [600] 31.7 [4600] 13.8 [2000] 25.5 [3700]
Water Absorption (%) 24hrs 0.27 0.19 0.28 0.47 0.31
Viscosity (cP) 1,100 @ 25ºC 300 @ 25ºC 1,200 @ 25ºC 340 @ 25ºC 180 @ 25ºC ‖ @ 25ºC

Features

  • Tack-free surface cure with low intensity LED lamps
  • Excellent gloss
  • Tin-free
  • Flexibility to prevent chipping
  • Superior hardness
  • Low yellowing
  • Low MEHQ levels and INCI listed
  • Excellent shelf stability up to 50°C

Applications

  • Tack-free nail gel top coats
  • Tack-free coatings for LED curing
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