Porcine Reproductive and Respiratory Syndrome (PRRS) Authors: Jeff Zimmerman, Iowa State University; David Benfield, The Ohio State University; Jane Christopher-Hennings, South Dakota State University; Scott Dee, University of Minnesota; Greg Stevenson, Purdue University.
Therefore, the substance zirconia aluminosilicate refractory ceramic fibres (SiO 2, Al 2 O 3, ZrO 2) as described in this document are a subset of the group of substances which are defined by the refractory ceramic fibres in Annex VI of the Regulation (EC) No 1272/2008.
Silicon dioxide, or silica, is a. polymeric solid with a three-dimensional network of silicon atoms bound in a tetrahedral. structure to four oxygen atoms, each of which are bound in turn to two silicon atoms. (Figure 13.1). In silicate minerals, this network is rearranged to accommodate other. metal oxides.