Classic Neuburg Siliceous Earth is a natural combination of corpuscular Neuburg Silica and lamellar kaolinite: a loose mixture impossible to separate by physical methods.
Neuburg Siliceous Earth is available in four different particle fractions, maked with the letter V, N, Z and P.
The measuring method for this particle size distribution is based on the Fraunhofer analysis of diffraction spectra.
The analyses were performed with a Matersizer 3000, a laser device from Malvern Instruments.