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Old 05-07-2018, 09:47 AM
Dave Bross Dave Bross is offline
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Join Date: Apr 2002
Location: Archer FL(near Gainesville)
Posts: 2,954
Dave Bross is on a distinguished road
To go a touch deeper on Pete's "quit using the term coe"

What really matters most is that the glasses match expansion at the point where they set up...usually referred to as softening or strain point. This gets tricky with time and temp but fortunately you can overcome much of the trickery by moving the expansion of one of the glasses.

Quite often two matching glasses will have very different calculated expansions.

Think of the calculated expansion as a number you use to see where you're going as you experiment to make two glasses match.

More detail:
Art is not a's a way.
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