Abstract: A ceramics dress substrate of the present invention capable of both performances of cutting a cut material with a high accuracy and dressing a diamond cutting grindstone with an excellent cutting property and an reduced wearing amount of the grindstone. This ceramics dress substrate comprises sintering a mixture of ceramics grinding particles and a silicate mineral, The ceramics grinding particles are preferably uniformed and have a scratch hardness ranging from 6 to 10. Alumina grinding particles, silicon carbide and mullite are preferably used as the ceramics grinding particles, and a kaolin mineral, pyrophyllite, montmorillonite, sericite, talc and chlorite are preferably used as the silicate mineral. The ceramics dress substrate is preferably coated with glass.

Abstract: Low temperature fired ceramics produced by firing at a low temperature a mixture consisting of, in weight percentages:(a) 50 to 65% of powder glass consisting of 10 to 55% of CaO, 45 to 70% of SiO.sub.2, 0 to 30% of Al.sub.2 O.sub.3 and up to 10% of impurities; and(b) 50 to 35% of powder Al.sub.2 O.sub.3 containing up to 10% of impurities. The glass component (a) may further contains B.sub.2 O.sub.3 up to 20% based on the total weight of the former glass-forming components. The ceramics exhibit excellent thermal conductivity, high mechanical strength, low thermal expansion and small dielectric constant and such advantageous combination of properties make them useful in many applications, more especially highly suited to the use as substrate of various electronic parts, components or multilayer integrated circuits. Also, since the ceramics can be prepared at lower firing temperatures and a higher heating rate, the production cost and time can be advantageously saved.