Abstract: There is provided a jig for use in heat treatment onto which a vitreous plate having had films exhibiting respective given functions formed on its surface is to be loaded when the vitreous plate undergoes heat treatment. The jig contains 50% by weight or more phase containing SiC, its thermal conductivity is 10 W/mK or more, its apparent porosity 0.2 to 25%, and in that its coefficient of thermal expansion is 3.8×10−6/°C. to 5.5×10−6/°C.

Abstract: This invention provides a firing jig for an electronic element comprising a spray coating layer made of a material less reactive to a material to be fired on a substrate made of a ceramic, wherein two or more spray coating layers are formed on the surface of the substrate, and at least a spray coating layer adjacent to the substrate and a spray coating layer adjacent to the material to be fired are made of different materials. When it is a firing jig for an electronic element comprising a ceramic substrate, a surface adjacent to the substrate is a spray coating layer and the surface of the spray coating layer is a flame coating layer. The firing jig for an electronic element has a longer life and can be produced with a lower cost.

Abstract: There is provided a jig for use in firing of ferrite-made member (e.g. deflection yoke). The jig contains MgO.Al.sub.2 O.sub.3 spinnel as the main component. In the jig, the molar ratio of total MgO and total Al.sub.2 O.sub.3 is 25:75 to 75:25; and RO, which is at least one kind of oxide selected from the group consisting of ZnO, CuO, MnO, NiO, CaO, SrO, BaO, PbO and CdO, is contained in an amount of 0 to 25 mole % per 100 mole % of the sum of total MgO and total Al.sub.2 O.sub.3. This jig is unreactive to a material (e.g. deflection yoke) to be fired and consequently gives rise to no dimensional change of the material to be fired.

Abstract: An antibacterial ceramic contains an antibacterial material produced by loading an antibacterial metal such as silver on a calcium ceramic carrier and an inorganic material such as cordierite, and has a bulk density of 0.6-1.2 g/cm.sup.3. An antibacterial ceramic filter contains an antibacterial material produced by loading an antibacterial metal such as silver on a calcium ceramic carrier, an aggregate such as mullite, and a binder such as frit, and has a porosity of 20% or more. The light-weight antibacterial ceramic is suitably applicable to a roof garden or the like. The antibacterial ceramic filter can remove and extirpate various bacteria and suspensions.

Abstract: A porous filter for metal hot melt comprises ceramic aggregate particles bound by an inorganic binder. The aggregate particles contain not less than 50 wt % of particles with a shape factor in the range of 100 to 130 and the binder has needle-shaped crystals deposited on the surface thereof. By employing this filter, debris catching ability and initial impregnation of metal hot melt are highly improved.

Abstract: A filter for aluminum hot melt comprises alumina aggregate particles and an inorganic binder in an amount of 5 to 20 parts by weight bound to 100 parts by weight of said alumina aggregate particles. The inorganic binder is composed to 15 wt % to 80 wt % of B.sub.2 O.sub.3, 2 wt % to 60 wt % of Al.sub.2 O.sub.3, 0 wt % to 30 wt % of CaO and 5 wt % to 50 wt % of MgO, and the presence of a highly crystalline binder in the filter yields better properties such as an increase in chemical durability and a lower thermal expansion coefficient where the crystallinity is defined by a peak height of 9Al.sub.2 O.sub.3 -2B.sub.2 O.sub.3 at 2.theta.=16.5.degree. being not less than 30% of a peak-height of .alpha.-Al.sub.2 O.sub.3 at 2.theta.=43.4.degree. when measured by powder X-ray diffractometry and is obtained by a cooling rate of less than 70.degree. C./hr.