UV/EB Oligomer
BR-741
BR-741: Difunctional Aliphatic Urethane Acrylate Oligomer
BR-741 is a low molecular weight, difunctional, aliphatic polyester urethane acrylate that can be effectively formulated for adhesion to steel, aluminum, and various plastics with some amount of surface energy. The resulting hard, tough film makes an effective protective coating, which will be non-yellowing, due to the aliphatic backbone of BR-741.
| Neat Properties | |
|---|---|
| Property | Value |
| Viscosity cP (60ºC) | 85,000 |
| Pt-Co (APHA) Color | 17 |
| Refractive Index (25ºC) | 1.488 |
| Density, g/cm3 (25ºC) | 1.12 |
| Monomer Dilution Properties | ||||||
|---|---|---|---|---|---|---|
| Value | ||||||
| Property | I30 | I50 | TM50 | TP50 | H50 | HE30 |
| Tensile Strength (MPa [psi]) | 66.2 [9600] | 75.8 [11000] | 75.8 [11000] | 59.3 [8600] | 60.7 [8800] | 51.7 [7500] |
| Elongation (%) | 3.4 | 4.3 | 2.8 | 4.8 | 4.6 | 7.0 |
| Elastic Modulus (MPa [ksi]) | 2,620.0 [380] | 2,757.9 [400] | 3,033.7 [440] | 2,344.2 [340] | 2,068.4 [300] | 2,413.2 [350] |
| Durometer Hardness | 89D | 88D | 92D | 87D | 86D | 90D |
| Water Absorption (%) 24hrs | 0.19 | 0.17 | 0.27 | 0.35 | 0.28 | 0.76 |
| MEK Double Rubs (#) | 65 | 15 | >200 | 180 | 190 | 100 |
| Viscosity (cP) | 37,000 @ 25ºC | 1,800 @ 25ºC | 12,000 @ 25ºC | 1,500 @ 25ºC | 400 @ 25ºC | 5,700 @ 25ºC |
** Tensile Properties per ASTM D882 - Not Tested || Incompatible X Unable to Measure