An alkali-free glass of the present invention includes as a glass composition, in terms of mass %, 55% to 70% of SiO.sub.2, 15% to 25% of Al.sub.2O.sub.3, 0% to 5% of B.sub.2O.sub.3, 3% to 10% of MgO, 7% to 20% of SrO, and 0% to 5% of BaO, is substantially free of an alkali metal oxide, and has a strain point of more than 720° C.

An alkali-free glass of the present invention includes as a glass composition, in terms of mass %, 55% to 70% of SiO.sub.2, 15% to 25% of Al.sub.2O.sub.3, 0% to 5% of B.sub.2O.sub.3, 3% to 10% of MgO, 7% to 20% of SrO, and 0% to 5% of BaO, is substantially free of an alkali metal oxide, and has a strain point of more than 720° C.

The present invention relates to a glass for chemical strengthening including, in mole percentage on an oxide basis: 45 to 75% of SiO.sub.2; 1 to 30% of Al.sub.2O.sub.3; 1 to 20% of Li.sub.2O; 0 to 5% of Y.sub.2O.sub.3; 0 to 5% of ZrO.sub.2; and 0 to 1% of TiO.sub.2, having a total content of one or more kinds of MgO, CaO, SrO, BaO and ZnO of 1 to 20%, having a total content of Na.sub.2O and K.sub.2O of 0 to 10%, having a total content of B.sub.2O.sub.3 and P.sub.2O.sub.5 of 0 to 10%, and having a value M expressed by the following expression of 1,000 or more: M=−5×[SiO.sub.2]+121×[Al.sub.2O.sub.3]+50×[Li.sub.2O]−35×[Na.sub.2O]+32×[K.sub.2O]+85×[MgO]+54×[CaO]−41×[Sr O]−4×[P.sub.2O.sub.5]+218×[Y.sub.2O.sub.3]+436×[ZrO.sub.2]−1180, in which each of [SiO.sub.2], [Al.sub.2O.sub.3], [Li.sub.2O], [Na.sub.2O], [K.sub.2O], [MgO], [CaO], [SrO], [P.sub.2O.sub.5], [Y.sub.2O.sub.3], and [ZrO.sub.2] designates a content of each component in mole percentage on an oxide basis.

Coated glass or glass ceramic substrates having high temperature resistance, high strength, and a low coefficient of thermal expansion. The coating includes pores, is fluid-tight and suitable for coating a temperature-resistant, high-strength glass or glass ceramic substrate with a low coefficient of thermal expansion, and to a method for producing such a coated substrate.

Coated glass or glass ceramic substrates having high temperature resistance, high strength, and a low coefficient of thermal expansion. The coating includes pores, is fluid-tight and suitable for coating a temperature-resistant, high-strength glass or glass ceramic substrate with a low coefficient of thermal expansion, and to a method for producing such a coated substrate.

The present invention relates to a crystallized glass including a crystalline phase consisting of Ba—Si—O, in which the crystallized glass includes Li, and crystallinity of Li-based crystals contained in the crystalline phase is 20% or lower as represented by weight %, a high-frequency substrate including the crystallized glass, and a manufacturing method for a crystallized glass including a crystalline phase consisting of Ba—Si—O, the method including: obtaining an amorphous glass by melt-shaping a material containing BaO and SiO.sub.2; and crystallizing the amorphous glass by holding the amorphous glass at a treatment temperature of 600° C. or higher and lower than 1,000° C.

A glass tube element is provided that includes hollow cylindrical section that has a shell enclosing a lumen and a path extending on a surface of the shell facing away from the lumen. The path extends across a first area of the shell where the stress values are within a first interval. The path also extends across a second area of the shell where the stress values are within a second interval.

A glass tube element is provided that includes hollow cylindrical section that has a shell enclosing a lumen and a path extending on a surface of the shell facing away from the lumen. The path extends across a first area of the shell where the stress values are within a first interval. The path also extends across a second area of the shell where the stress values are within a second interval.

A glass-resin composite of the present invention includes at least a plurality of glass sheets and a resin sheet which are integrally combined with each other via an organic resin intermediate layer, wherein, out of inner glass sheets of the plurality of glass sheets, at least one glass sheet has a crystallinity of 30% or less and a Young's modulus of 75 GPa or more.

A glass-resin composite of the present invention includes at least a plurality of glass sheets and a resin sheet which are integrally combined with each other via an organic resin intermediate layer, wherein, out of inner glass sheets of the plurality of glass sheets, at least one glass sheet has a crystallinity of 30% or less and a Young's modulus of 75 GPa or more.