Thermal expansion coefficient question

[pancuronium]

Does anybee know what the maximum thermal expansion coefficient spread is allowable before an intermediate is necessary to bond two different glass formulas?  This engineering consideration must bee built into my new experimental apparatus.
  Thanks hive mates, couldnt do it without you.

[Organikum]

the glassworking DJVUs at Rhodiums page and send a "thank you" PM to lugh and Rhodium.