The material used to manufacture our Biopsy Pads is fully reticulated, fine pore, soft and flexible, polyester urethane foam.This means that all the bubbles that form blocks have burst leaving behind a fine framework of the foam material. The importance of this property cannot be understated as the retention of processing solutions is minimised and therefore lessens carry-over. In addition, fully reticulated foam allows the maximum transfer of processing solutions through contained biopsies.When standard foam is used, where most of the foam bubbles are still intact, the foam acts as a sponge and will retain fluids, limiting circulation. This type of foam can be easily identified by its shiny appearance. Biopsy Pads should not be referred to as a sponge as they are actually a filter.Also, if the foam is too coarse and/or hard, the contained biopsies can be damaged by compression. These are possibly the major contributory factors to the artifacts that many Histologists see when using biopsy pads.