Powder formed from mineral or rock material with controlled particle size distribution for thermal films

摘要

An ultra-fine powder formed from a naturally occurring mineral or rock material and having a controlled or “engineered” particle size distribution (PSD) to match the infrared spectra with a maximum particle size in the range of 14-17 microns measured as either D99, or preferably D95, and a minimum particle size D5 in the range of 4-7 microns. Preferably the maximum particle size is about 15 microns, the minimum particle size is about 5 microns and the D50 particle size is about 8-10 microns with the moisture content of the particle size “engineered” powder being less than about 0.20 percent by weight and preferably about 0.05 to 0.08 percent by weight of the powder. This specially “engineered” ultra-fine powder is used to reduce the thermicity of thermal film to a value less than about 20%.

主权项

1. An ultra-fine powder formed from a naturally occurring mineral or rock material, said powder having a particle size distribution with an engineered maximum particle size and an engineered minimum particle size, said engineered maximum particle size having a value in the range of about 14 to 17 microns and said engineered minimum particle size having a value in the range of about 2 to 7 microns, said powder has a particle size spread between the maximum particle size of said powder and the minimum particle size of said powder and said particle size spread is less than about 12 microns.