A method for the production of synthetic quartz glass using a special cleaning device is provided. The method includes (a) evaporating a production material containing a polymerizable polyalkylsiloxane compound while forming a production material vapor, (b) passing the production material vapor resulting from step (a) through a cleaning device to purify the production material vapor, (c) supplying the purified production material vapor resulting from step (b) to a reaction zone in which the purified production material vapor is converted to SiO.sub.2 particles through oxidation and/or through hydrolysis, (d) depositing the SiO.sub.2 particles resulting from step (c) on a deposition surface, and optionally drying and vitrifying the deposited SiO.sub.2 particles resulting from step (d) to form synthetic quartz glass. The cleaning device includes a bulk of porous silica particles which have a BET specific surface area of at least 2 m.sup.2/g. A device for carrying out the method is also provided.

A method for specifying the material of glass or glass ceramic components by either the minimum service life of a component as a function of a predefined mechanical stress or the mechanical resistance as a function of a predefined service life during which mechanical stress occurs. The method enables a leaner dimensioning of mechanically stressed glass and glass ceramic components.

A method for specifying the material of glass or glass ceramic components by either the minimum service life of a component as a function of a predefined mechanical stress or the mechanical resistance as a function of a predefined service life during which mechanical stress occurs. The method enables a leaner dimensioning of mechanically stressed glass and glass ceramic components.

A quartz glass plate has a quartz glass plate body and a quartz glass member adhered to the quartz glass plate body through an adhesive layer, where the adhesive layer contains silica, and a sum of concentrations of Li, Na, and K ions, being alkali metal ions and Ca ions, being alkaline earth metal ions contained in the adhesive layer is 10 ppm by mass or less. Consequently, a step with a uniform thickness can be formed, and a quartz glass plate is not easily damaged by irradiation with a light containing an ultraviolet ray.

A quartz glass plate has a quartz glass plate body and a quartz glass member adhered to the quartz glass plate body through an adhesive layer, where the adhesive layer contains silica, and a sum of concentrations of Li, Na, and K ions, being alkali metal ions and Ca ions, being alkaline earth metal ions contained in the adhesive layer is 10 ppm by mass or less. Consequently, a step with a uniform thickness can be formed, and a quartz glass plate is not easily damaged by irradiation with a light containing an ultraviolet ray.

A fabricating method for a quartz vial having a body for containing a substance, a bottom closing a lower end of the body, a cylindrical neck disposed above the body, and a cylindrical mouth disposed above the neck and having an outer diameter larger than that of the neck includes the steps of forming an outer peripheral surface of the neck by shaving, and joining by thermal fusion, to the neck, the body that is separately fabricated. Thus, quartz vials having a predetermined shape can be mass-fabricated.

Provided is a filler powder that has a lower coefficient of thermal expansion than silica powder and can provide a resin composition having an excellent light transmittance. The filler powder is made of a crystallized glass with β-quartz solid solution and/or β-eucryptite precipitated therein, wherein a ratio D90/D10 between a 10% cumulative particle diameter (D10) and a 90% cumulative particle diameter (D90) both obtained by measuring a particle size distribution of the filler powder by a laser diffraction and scattering method is 20 or less.

Provided is a filler powder that has a lower coefficient of thermal expansion than silica powder and can provide a resin composition having an excellent light transmittance. The filler powder is made of a crystallized glass with β-quartz solid solution and/or β-eucryptite precipitated therein, wherein a ratio D90/D10 between a 10% cumulative particle diameter (D10) and a 90% cumulative particle diameter (D90) both obtained by measuring a particle size distribution of the filler powder by a laser diffraction and scattering method is 20 or less.

A device for producing a high-purity medical glass container from a hollow cylindrical glass blank extending along an axial direction (X) and having at least one open end, wherein the glass blank has a mouldable moulded section extending in the axial direction (X) from the open end. The device comprises a first moulding tool and a second moulding tool, where the first moulding tool has a moulding pin. The moulding pin can be moved via the open end of the hollow cylindrical glass blank in the moulded section thereof along the axial direction (X), wherein the moulding pin is fixed in a fixing unit of the first moulding tool. The moulded section can be deformed by the second moulding tool in such a way that an inner surface of the moulded section is in contact with the moulding pin, whereby the moulded section forms a channel.

A quartz glass crucible including bottom, curved, and straight body portions, where the quartz glass crucible includes an outer layer including opaque quartz glass containing bubbles, and an inner layer including transparent quartz glass, the outer layer fabricated from different types of raw material powder, the outer layer having regions sectioned by bubble content densities, and bubble content densities of two outer layer adjacent regions, when d.sub.a (pcs/mm.sup.3) is defined as content density of a region “a” having a greater content density, and d.sub.b (pcs/mm.sup.3) is defined as content density of a region “b” having a smaller content density, a difference D=(d.sub.a−d.sub.b)/d.sub.b between content densities of the two regions is 10% or more.