BR-640D
BR-640D: Difunctional Aliphatic Polybutadiene Urethane Acrylate Oligomer
BR-640D is a polybutadiene (PBD) urethane acrylate with a functionality of two. Designed to meet rigorous electronic applications, BR-640D has many desirable properties typical to PBD resins, combined with radiation curability. In applications requiring thermal cycling resistance, BR-640D withstands the extremes of temperature typical of such tests, without undue degradation of properties. Excellent hydrophobic properties exhibited where 0.012 and 0.037% water was absorbed by cured coating when submerged in water for 24 hours. In addition to the adhesion properties listed in the table below, BR-640D showed excellent adhesion to ABS, acrylic, nylon-6, PVC, and PS.
| Neat Properties | |
|---|---|
| Property | Value |
| Viscosity cP (60ºC) | 5,000 |
| Pt-Co (APHA) Color | 15 |
| Refractive Index (25ºC) | 1.48 |
| Density, g/cm3 (25ºC) | 0.94 |
| Monomer Dilution Properties | ||||||
|---|---|---|---|---|---|---|
| Value | ||||||
| Property | I30 | I50 | TM50 | TP50 | H50 | HE30 |
| Tensile Strength (MPa [psi]) | 3.4 [500] | 5.5 [800] | ‖ | ‖ | 9.0 [1300] | 3.4 [500] |
| Elongation (%) | 190 | 190 | ‖ | ‖ | 10 | 60 |
| Elastic Modulus (MPa [ksi]) | 1.9 [0.27] | 4.5 [0.65] | ‖ | ‖ | 241.3 [35] | 11.7 [1.7] |
| Durometer Hardness | 76A | 45D | ‖ | ‖ | 66D | 45D |
| Water Absorption (%) 24hrs | 0.01 | 0.04 | ‖ | ‖ | 0.09 | 0.85 |
| MEK Double Rubs (#) | 65 | 9 | ‖ | ‖ | >200 | 10 |
| Viscosity (cP) | 15,000 @ 25ºC | 1,500 @ 25ºC | ‖ @ 25ºC | ‖ @ 25ºC | 60 @ 25ºC | 9,900 @ 25ºC |
** Tensile Properties per ASTM D882 - Not Tested || Incompatible X Unable to Measure