Momentive Performance Materials PolarTherm boron nitride (BN) powders of grades PT120, PT140, PT160, and PT180 are primarily single-crystal hexagonal platelets possessing very high purity. These powders possess mean particle sizes inthe range of 6 to 13 μm and are >99% -325 mesh.
The high-temperature processing and single-crystal nature of these powder grades make them outstanding thermal conductors.
PT120
PT120 has a hexagonal platelet structure with a slightly larger particle size (12-13 μm) than PT140,
PT160, and PT180, as well as a lower surface area. It also has a more uniform particle size distribution.
PT140
PT140isrefinedtoachievealowersurfacearea.This
gives improved blending results in many formulations.
PT160
Grade PT160 falls in the middle of the PT120-180
range in terms of mean particle size (7-10 μm) and surface area (13 m2/g), and, as such, is suitable as an additive in abroad range of materials. PT180
PT180 is processed to achieve agglomerated particles,
and therefore a higher specific surface area than similar grades.This results in a random crystal orientation when loaded in a polymer matrix, thus
creating numerous thermal paths enhancing the overall thermal conductivity. |
