(JP8151270-A)      A ceramic sheet has: (i) an area of 400 cm2 min. and a thickness of 0.4 mm max., (ii) a waviness height of 100 micron max. and a warp of 0.1% max., and (iii) a frequency of generated cracks of less than 10% when successive tests are applied comprising: a load-bearing test where the ceramic sheet is interposed between high density, flat alumina sheets and a load of 0.1 kgf/cm2 is applied to the whole face of the ceramic sheet; a deflection test where forces parallel to the surface of the sheet are applied to opposite sides of the sheet so as to deflect the sheet by a height h (mm)given by    h = 0.002 x d/t2    where d = width of sheet, t = thickness of sheet, h is less than or equal to 0.1 x d; and the test is repeated six times at one second intervals alternately in front and back directions.    Also claimed are: (a) a prodn. method where the green sheet is calcined when fully interposed between porous sheets which have a density of 30-85% of the theoretical density and which shrink by 5% max. during calcination; and (b) a prodn. method as described in (a) where one porous sheet as described is placed on the green sheet.    USE -   The sheet is useful as a sensor part, an electrolytic film for a fuel cell (claimed), a setter for calcination, a substrate for a hybrid IC circuit and a sliding member.    ADVANTAGE -   The ceramic sheets have good heat insulating and electrical insulating props..    (JP8151271-A)      A ceramic sheet has: (i) an area of 400 cm2 min. and a thickness of 0.4 mm max., (ii) a waviness height of 100 micron max. and a warp of 0.1% max., and (iii) a frequency of generated cracks of less than 10% when successive tests are applied comprising: a load-bearing test where the ceramic sheet is interposed between high density, flat alumina sheets and a load of 0.1 kgf/cm2 is applied to the whole face of the ceramic sheet; a deflection test where forces parallel to the surface of the sheet are applied to opposite sides of the sheet so as to deflect the sheet by a height h (mm)given by    h = 0.002 x d/t2    where d = width of sheet, t = thickness of sheet, h is less than or equal to 0.1 x d; and the test is repeated six times at one second intervals alternately in front and back directions.    Also claimed are: (a) a prodn. method where the green sheet is calcined when fully interposed between porous sheets which have a density of 30-85% of the theoretical density and which shrink by 5% max. during calcination; and (b) a prodn. method as described in (a) where one porous sheet as described is placed on the green sheet.    USE -   The sheet is useful as a sensor part, an electrolytic film for a fuel cell (claimed), a setter for calcination, a substrate for a hybrid IC circuit and a sliding member.    ADVANTAGE -   The ceramic sheets have good heat insulating and electrical insulating props..    (JP8151275-A)      A ceramic sheet has: (i) an area of 400 cm2 min. and a thickness of 0.4 mm max., (ii) a waviness height of 100 micron max. and a warp of 0.1% max., and (iii) a frequency of generated cracks of less than 10% when successive tests are applied comprising: a load-bearing test where the ceramic sheet is interposed between high density, flat alumina sheets and a load of 0.1 kgf/cm2 is applied to the whole face of the ceramic sheet; a deflection test where forces parallel to the surface of the sheet are applied to opposite sides of the sheet so as to deflect the sheet by a height h (mm)given by    h = 0.002 x d/t2    where d = width of sheet, t = thickness of sheet, h is less than or equal to 0.1 x d; and the test is repeated six times at one second intervals alternately in front and back directions.    Also claimed are: (a) a prodn. method where the green sheet is calcined when fully interposed between porous sheets which have a density of 30-85% of the theoretical density and which shrink by 5% max. during calcination; and (b) a prodn. method as described in (a) where one porous sheet as described is placed on the green sheet.    USE -   The sheet is useful as a sensor part, an electrolytic film for a fuel cell (claimed), a setter for calcination, a substrate for a hybrid IC circuit and a sliding member.    ADVANTAGE -   The ceramic sheets have good heat insulating and electrical insulating props..    (JP2734425-B2)      A ceramic sheet has: (i) an area of 400 cm2 min. and a thickness of 0.4 mm max., (ii) a waviness height of 100 micron max. and a warp of 0.1% max., and (iii) a frequency of generated cracks of less than 10% when successive tests are applied comprising: a load-bearing test where the ceramic sheet is interposed between high density, flat alumina sheets and a load of 0.1 kgf/cm2 is applied to the whole face of the ceramic sheet; a deflection test where forces parallel to the surface of the sheet are applied to opposite sides of the sheet so as to deflect the sheet by a height h (mm)given by    h = 0.002 x d/t2    where d = width of sheet, t = thickness of sheet, h is less than or equal to 0.1 x d; and the test is repeated six times at one second intervals alternately in front and back directions.    Also claimed are: (a) a prodn. method where the green sheet is calcined when fully interposed between porous sheets which have a density of 30-85% of the theoretical density and which shrink by 5% max. during calcination; and (b) a prodn. method as described in (a) where one porous sheet as described is placed on the green sheet.    USE -   The sheet is useful as a sensor part, an electrolytic film for a fuel cell (claimed), a setter for calcination, a substrate for a hybrid IC circuit and a sliding member.    ADVANTAGE -   The ceramic sheets have good heat insulating and electrical insulating props..    (JP10095664-A)      A ceramic sheet has: (i) an area of 400 cm2 min. and a thickness of 0.4 mm max., (ii) a waviness height of 100 micron max. and a warp of 0.1% max., and (iii) a frequency of generated cracks of less than 10% when successive tests are applied comprising: a load-bearing test where the ceramic sheet is interposed between high density, flat alumina sheets and a load of 0.1 kgf/cm2 is applied to the whole face of the ceramic sheet; a deflection test where forces parallel to the surface of the sheet are applied to opposite sides of the sheet so as to deflect the sheet by a height h (mm)given by    h = 0.002 x d/t2    where d = width of sheet, t = thickness of sheet, h is less than or equal to 0.1 x d; and the test is repeated six times at one second intervals alternately in front and back directions.    Also claimed are: (a) a prodn. method where the green sheet is calcined when fully interposed between porous sheets which have a density of 30-85% of the theoretical density and which shrink by 5% max. during calcination; and (b) a prodn. method as described in (a) where one porous sheet as described is placed on the green sheet.    USE -   The sheet is useful as a sensor part, an electrolytic film for a fuel cell (claimed), a setter for calcination, a substrate for a hybrid IC circuit and a sliding member.    ADVANTAGE -   The ceramic sheets have good heat insulating and electrical insulating props..    (JP2830795-B2)      A ceramic sheet has: (i) an area of 400 cm2 min. and a thickness of 0.4 mm max., (ii) a waviness height of 100 micron max. and a warp of 0.1% max., and (iii) a frequency of generated cracks of less than 10% when successive tests are applied comprising: a load-bearing test where the ceramic sheet is interposed between high density, flat alumina sheets and a load of 0.1 kgf/cm2 is applied to the whole face of the ceramic sheet; a deflection test where forces parallel to the surface of the sheet are applied to opposite sides of the sheet so as to deflect the sheet by a height h (mm)given by    h = 0.002 x d/t2    where d = width of sheet, t = thickness of sheet, h is less than or equal to 0.1 x d; and the test is repeated six times at one second intervals alternately in front and back directions.    Also claimed are: (a) a prodn. method where the green sheet is calcined when fully interposed between porous sheets which have a density of 30-85% of the theoretical density and which shrink by 5% max. during calcination; and (b) a prodn. method as described in (a) where one porous sheet as described is placed on the green sheet.    USE -   The sheet is useful as a sensor part, an electrolytic film for a fuel cell (claimed), a setter for calcination, a substrate for a hybrid IC circuit and a sliding member.    ADVANTAGE -   The ceramic sheets have good heat insulating and electrical insulating props..    (JP2830796-B2)      A ceramic sheet has: (i) an area of 400 cm2 min. and a thickness of 0.4 mm max., (ii) a waviness height of 100 micron max. and a warp of 0.1% max., and (iii) a frequency of generated cracks of less than 10% when successive tests are applied comprising: a load-bearing test where the ceramic sheet is interposed between high density, flat alumina sheets and a load of 0.1 kgf/cm2 is applied to the whole face of the ceramic sheet; a deflection test where forces parallel to the surface of the sheet are applied to opposite sides of the sheet so as to deflect the sheet by a height h (mm)given by    h = 0.002 x d/t2    where d = width of sheet, t = thickness of sheet, h is less than or equal to 0.1 x d; and the test is repeated six times at one second intervals alternately in front and back directions.    Also claimed are: (a) a prodn. method where the green sheet is calcined when fully interposed between porous sheets which have a density of 30-85% of the theoretical density and which shrink by 5% max. during calcination; and (b) a prodn. method as described in (a) where one porous sheet as described is placed on the green sheet.    USE -   The sheet is useful as a sensor part, an electrolytic film for a fuel cell (claimed), a setter for calcination, a substrate for a hybrid IC circuit and a sliding member.    ADVANTAGE -   The ceramic sheets have good heat insulating and electrical insulating props..    (US6001761-A)      A ceramic sheet has: (i) an area of 400 cm2 min. and a thickness of 0.4 mm max., (ii) a waviness height of 100 micron max. and a warp of 0.1% max., and (iii) a frequency of generated cracks of less than 10% when successive tests are applied comprising: a load-bearing test where the ceramic sheet is interposed between high density, flat alumina sheets and a load of 0.1 kgf/cm2 is applied to the whole face of the ceramic sheet; a deflection test where forces parallel to the surface of the sheet are applied to opposite sides of the sheet so as to deflect the sheet by a height h (mm)given by    h = 0.002 x d/t2    where d = width of sheet, t = thickness of sheet, h is less than or equal to 0.1 x d; and the test is repeated six times at one second intervals alternately in front and back directions.    Also claimed are: (a) a prodn. method where the green sheet is calcined when fully interposed between porous sheets which have a density of 30-85% of the theoretical density and which shrink by 5% max. during calcination; and (b) a prodn. method as described in (a) where one porous sheet as described is placed on the green sheet.    USE -   The sheet is useful as a sensor part, an electrolytic film for a fuel cell (claimed), a setter for calcination, a substrate for a hybrid IC circuit and a sliding member.    ADVANTAGE -   The ceramic sheets have good heat insulating and electrical insulating props..    (EP704413-B1)      A ceramic sheet has: (i) an area of 400 cm2 min. and a thickness of 0.4 mm max., (ii) a waviness height of 100 micron max. and a warp of 0.1% max., and (iii) a frequency of generated cracks of less than 10% when successive tests are applied comprising: a load-bearing test where the ceramic sheet is interposed between high density, flat alumina sheets and a load of 0.1 kgf/cm2 is applied to the whole face of the ceramic sheet; a deflection test where forces parallel to the surface of the sheet are applied to opposite sides of the sheet so as to deflect the sheet by a height h (mm)given by    h = 0.002 x d/t2    where d = width of sheet, t = thickness of sheet, h is less than or equal to 0.1 x d; and the test is repeated six times at one second intervals alternately in front and back directions.    Also claimed are: (a) a prodn. method where the green sheet is calcined when fully interposed between porous sheets which have a density of 30-85% of the theoretical density and which shrink by 5% max. during calcination; and (b) a prodn. method as described in (a) where one porous sheet as described is placed on the green sheet.    USE -   The sheet is useful as a sensor part, an electrolytic film for a fuel cell (claimed), a setter for calcination, a substrate for a hybrid IC circuit and a sliding member.    ADVANTAGE -   The ceramic sheets have good heat insulating and electrical insulating props..