Method for making a dimensionally stable green ceramic sheet

A process for dimensionally stabilizing a green card cut from a cast sheet of frit bound together with a binder, said process comprising,

• (a) contacting said card in an aqueous bath which is essentially free of a solvent for a water-insoluble thermoplastic synthetic resinous component of said binder, said aqueous bath being at a temperature in the range from about 0.degree. C. to about 95.degree. C.;
• (b) maintaining said card in said bath at least until said card reaches the temperature of said bath;
• (c) drying said card until essentially all water from within pores of said card is removed;
• and, p1 (d) storing said dried card in ambient atmosphere in the range from about 10.degree. C. to about 30.degree. C. for a period from 30 min to 8 hr, whereby upon further drying at a temperature below 200.degree. C., said dried card shrinks no more than 0.1 mil/inch in the direction of either lateral axis, or either diagonal axis, so as to yield a dimensionally stable green card.

A process for dimensionally stabilizing a green card cut from a cast sheet of frit bound together with a binder, comprising:

• (a) contacting said card with a relatively moisture free atmosphere having less than about 30% relative humidity for less than about 1 hour, at a temperature in the range from about 40.degree. C. to about 95.degree. C., to ensure that the card is essentially solvent free;
• (b) increasing the relative humidity to 100% and maintaining a temperature in the range from about 60-95.degree. C. for sufficient time, but less than about 1 hour, to allow the water vapor to permeate the pores of the green card, resulting in a humidified green card;
• and
• (c) storing said humidified green card at storage temperature in the range from about 20.degree. C. to 30.degree. C. for at least 10 minutes to cool the card.