Glass-ceramic product with variably adjustable zero crossing of the CTE-T curve

A process for producing a glass-ceramic which has a zero crossing of the CTE-T curve at a selected temperature TA±10° C., comprising providing a glass-ceramic or a green body of a glass-ceramic and ceramicizing in accordance with a ceramicizing program, determination of which comprises determining the CTE-T curve, wherein

• a) the determination of the CTE-T curve comprises
• providing a green body or a pre-ceramicized glass-ceramic,
• determining Δl/l0−T measurement points for the glass-ceramic in a temperature range TA±50° C.,
• matching a polynomial to the Δl/l0−T measurement points, and
• deriving the polynomial to obtain a CTE-T curve;
• or
• b) the zero crossing of the CTE-T curve is set at TA±7° C.;
• or
• c) the zero crossing of the CTE-curve is set at TA±5° C.;
• or
• d) the glass-ceramic is ceramicized in at least two ceramicizing steps.