Residual dirt analyses for counting particles
Residual dirt analysis is carried out by inspecting samples of product and packaging for residual dirt particles. Those particles can be both product parts respectively abrasion such as rubber or plastic particles, as well as fibers or human tissue.
During sample preparation, the product is rinsed with highly cleaned water, which is then filtered on a paper filter with a pore size of 0.8 micrometers. The dirt particles remain on the filter membrane, which is stored in a petrislide made of plastic and then closed with a transparent lid.