Pyrex has a higher melting point than ordinary glass, so it prevents the molten regular glass from going through the extruder well. So if there’s a pyrex glass in a batch of recycled glass, it (the molten glass) all goes to the landfill.
52 posted on 03/18/2009 9:10:41 PM PDT by Koblenz
(The Dem Platform, condensed: 1. Tax and Spend. 2. Cut and Run. 3. Man on Man)