Cord

From the choices you have made the problem you are experiencing
is most likely to be caused by problems with :

Pre melt

Melting

Bad batch mixing Batch segregation problems Batch weighing problems Cullet variations Change in composition (between bins) Foreign object contamination Liquid contamination

Zircon cord from glass contact material Clear streaks caused by volatilisation of fluorides (Opal Glass) Streaks caused by volatilisation of : alkalis and boric acid (Borosilicate Glass) Steaks caused by volatisation of : Lead oxides (Lead Crystal Glass) Stagnant glass disturbed by pull changes Stagnant glass bleeding after colour / composition change Frit feed problems in colorant section Inadequate stirrer speed

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