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]) | 7.6 [1100] | 18.6 [2700] | ‖ | 13.8 [2000] | 10.3 [1500] | — |
| Elongation (%) | 55 | 65 | ‖ | 25 | 3 | — |
| Elastic Modulus (MPa [ksi]) | 53.1 [7.7] | 551.6 [80] | ‖ | 275.8 [40] | 448.2 [65] | — |
| Durometer Hardness | 84A | 58D | ‖ | 69D | 76D | — |
| Water Absorption (%) 24hrs | 0.04 | 0.03 | ‖ | — | — | — |
| MEK Double Rubs (#) | 10 | 7 | ‖ | 40 | >200 | — |
| Viscosity (cP) | 19,000 @ 25ºC | 2,100 @ 25ºC | ‖ @ 25ºC | 2,300 @ 25ºC | 900 @ 25ºC | — @ 25ºC |
** Tensile Properties per ASTM D882 - Not Tested || Incompatible X Unable to Measure