Crushed glass frit is made from glass recycled from the production of
fusible sheet glass at Spectrum and Uroboros Glass companies. All pieces
salvaged for use as frit are separated from all other glass at the time
of production to that insure purity and expansion tolerance standards
for frit are consistently met. Fine and powder grades are magnetically
cleaned of metal residues, and all grades are fuse tested to the System
96 clear fusing standard after crushing and sizing.