Porous powders find application in many industries these days. These range from catalysts to pharmaceuticals; from environmental cleanup to liquid chromatography. Not only is it important to know the pore size distribution of these powders, but it is also crucial to have a reliable particle size distribution analysis of these materials. In general, these analyses can be performed in much the same way as analyses of nonporous particles. When using laser-scattering particle size analysis, however, a few additional precautions are necessary. 全自动数字式激光粒度仪