The combination of ingredients used to make glassware is different from what goes into container glass for bottles and jars. If these two types of glass are recycled together, the resulting glass will not be suitable for container glass. In fact, glassware, ceramics, window panes, or mirrors can pose a threat to equipment in a glass recycling plant. - See more at: http://www.recyclethis.co.uk/20070418/how-can-i-reuse-or-recycle-a-broken-glass#sthash.HPAJ2PmO.dpuf