UV/EB Oligomer
BR-643
BR-643: Difunctional Aliphatic Polybutadiene Urethane Acrylate Oligomer
BR-643 is a polybutadiene (PBD) urethane acrylate. Designed to meet rigorous electronic applications, BR-643 has many desirable properties typical to PBD resins, combined with radiation curability. In applications requiring thermal cycling resistance, BR-643 withstands the extremes of temperature typical of such tests, without undue degradation of properties.
| Neat Properties | |
|---|---|
| Property | Value |
| Viscosity cP (60ºC) | 17,000 |
| Pt-Co (APHA) Color | 50 |
| Refractive Index (25ºC) | 1.508 |
| Density, g/cm3 (25ºC) | 0.95 |
| Monomer Dilution Properties | ||||||
|---|---|---|---|---|---|---|
| Value | ||||||
| Property | I30 | I50 | TM50 | TP50 | H50 | HE30 |
| Tensile Strength (MPa [psi]) | 13.1 [1900] | 25.5 [3700] | ‖ | 13.8 [2000] | 27.6 [4000] | 3.4 [490] |
| Elongation (%) | 53.0 | 54.5 | ‖ | 10.8 | 9.6 | 41.0 |
| Elastic Modulus (MPa [ksi]) | 158.6 [23.0] | 930.8 [135.0] | || | 368.9 [53.5] | 648.1 [94.0] | 12.3 [1.78] |
| Durometer Hardness | 39D | 51D | ‖ | 74D | 80D | 31D |
| Water Absorption (%) 24hrs | 0.09 | 0.15 | ‖ | 0.25 | 0.21 | 0.72 |
| MEK Double Rubs (#) | 11 | 12 | ‖ | 31 | 60 | 200 |
| Viscosity (cP) | 15,000 @ 25ºC | 1,800 @ 25ºC | ‖ @ 25ºC | 1,900 @ 25ºC | 800 @ 25ºC | 5,100 @ 25ºC |
** Tensile Properties per ASTM D882 - Not Tested || Incompatible X Unable to Measure