UV/EB Oligomer
BR-641S
BR-641S: Difunctional Aliphatic Polybutadiene Urethane Acrylate
BR-641S is an IBOA-free polybutadiene (PBD) urethane acrylate oligomer designed to meet rigorous electronic applications. BR-641S has many desirable properties typical to PBD resins combined with UV-curability. In applications requiring thermal cycling resistance, BR-641S withstands the extremes of temperature typical of such tests without undue degradation of properties.
| Neat Properties | |
|---|---|
| Property | Value |
| Viscosity cP (60ºC) | 57,000 |
| Pt-Co (APHA) Color | 30 |
| Refractive Index (25ºC) | 1.484 |
| Density, g/cm3 (25ºC) | 0.91 |
| Monomer Dilution Properties | ||||||
|---|---|---|---|---|---|---|
| Value | ||||||
| Property | I30 | I50 | TM50 | TP50 | H50 | HE30 |
| Tensile Strength (MPa [psi]) | 4.1 [600] | 16.5 [2400] | II | II | II | II |
| Elongation (%) | 130 | 210 | II | II | II | II |
| Elastic Modulus (MPa [ksi]) | 9.0 [1.3] | 103.4 [15] | II | II | II | II |
| Durometer Hardness | 65A | 82A | II | II | II | II |
| Water Absorption (%) 24hrs | ||||||
| MEK Double Rubs (#) | 38 | 13 | II | II | II | II |
| Viscosity (cP) | 35,000 @ 25ºC | 2,800 @ 25ºC | II @ 25ºC | II @ 25ºC | II @ 25ºC | II @ 25ºC |
** Tensile Properties per ASTM D882 - Not Tested || Incompatible X Unable to Measure