Stones

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

Refractory / Ceramic	Metal / Metal Oxides
Spout jointing compound Burner block bedding mortar Ceramic fibre board or wool Loose material sucked or pushed in through inspection holes Worn/damaged skimmer block Mis-aligned forehearth Damaged tube or stirrers Thermal shocking of refractories Debris from construction Batch problems Carry over from regenerators Crown dripping (Silica)	Thermocouple break-up Electrode break-up (including earth electrode) Foreign objects in batch Welding slag Swarf from assembly

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