Bottle slumping

Stephen Richard

If all you are doing is slumping, 787C seems high.

Also 515C seems low for an annealing soak, since most bottle glass behaves pretty much like float.

I presume you do more than just switch off after the hour at annealing soak.  Depending on how thick the piece is I would consider 80C/hr to about 400C to do the annealing, before cooling faster.

Still, it is only a bottle.



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