The Fraunhofer IMWS uses various methods to determine the filler and glass fiber content in a material. One common method is thermogravimetric analysis (TGA), in which the material is heated and the weight loss measured. The filler and glass fiber content can be calculated by comparison with reference materials. Another method is microscopy, in which the material is examined under a microscope to determine the number and distribution of fillers and glass fibers. It should be noted that the exact determination of the filler and glass fiber content depends on various factors, such as the type of material, the composition, and the specific requirements of the analysis.