Bomar Resins
LumiSet™ Resin


LSR-241: Hydrophobic Urethane Methacrylate Resin

LumiSet™ LSR-241 is a hydrophobic urethane methacrylate resin designed for use in top coat applications for hybrid and long-wear nail lacquers. Synthesized using building blocks from nail gel chemistries, LSR-241 is a solvent-borne film-forming resin that can offer nail lacquer formulators the benefits of impact resistance, gloss, and durability from nail gels while also achieving a tack-free finish without the need for UV or LED lamps. The combination of toughness, gloss, and hydrophobicity offers formulators an alternative to leachable plasticizers or potentially toxic gloss enhancers. Top coats formulated with LSR-241 should be paired with an adhesion-promoting base coat or base/color coat combo to ensure proper adhesion to the nail bed. LSR-241 is INCI registered and can be formulated to cure with sunlight exposure using appropriate INCI-registered photoinitiators.

Uncured Properties
Viscosity, cP (25°C)400
Yellowness Index (b*) ǂ0.14
Density, g/cm3 (25°C)0.95
MEHQ Content (ppm)Undetectable
% Solids24% in butyl/ethyl acetate blend
Tack Free Time (min.) ǂǂ1.3

ǂ Per ASTM E313
ǂ Per ASTM D5895 5 mil wet film, reduced to 30% solid with butyl acetate

Film Properties Reduced To 30% Solids With Butyl Acetate
PropertyAir DriedSunlight Cured
Tensile Strength, psi**4,5005,200
Elongation, %**66
Elastic Modulus, ksi**190205
Toughness (J)0.0700.083
Sward Hardness - 30 minutes1015
Sward Hardness - 24 hours1215
Contact Angle9499
Gloss on glass plate 20°6363
Gloss on glass plate 60°8585
Gloss on glass plate 85°9595

** Per ASTM D882. Air-dried and cured in Q-Sun for 1 hour at 0.19 W/m2


  • Excellent hydrophobicity in the polymer backbone
  • Fast dry times for top coat applications
  • Dries to a tack-free film
  • Inherent toughness improves chip resistance
  • Reactive to cure with sunlight exposure
  • High gloss finish


  • Hybrid nail lacquer top coats
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