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Some Possible Causes
- Refractories from
the furnace or forehearth are falling into the molten glass
- Batch materials
are contaminated or incorrectly melted
- Furnace pull may
be too high
- Flames impinging
on furnace refractories
- Contaminated cullet
Note: The production
personnel cannot cure this defect, but it must be reported immediately,
as it is symptomatic of more serious trouble
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