<Li> Matte glaze A dull - surfaced glaze with no gloss . </Li> <Li> Maturing temperature The temperature at which a glaze exhibits it best qualities . </Li> <Li> Maturity . The combined effects of firing time and firing temperature on ceramic wares in a kiln . Within limits, wares fired at low temperatures for extended periods may develop a degree of maturity similar to that achieved by applying higher firing temperatures for shorter periods . (W) </Li> <Li> Modulus of Rupture . The maximum transverse breaking stress applied under specified conditions, that a material will withstand before fracture . It is used as a common quality control test used for both ceramic raw materials and ceramic bodies . (W) </Li>

Clay that has been fired in a kiln once is called