A borosilicate-based composition, including: 50-85 mol. % SiO.sub.2, 10-40 mol. % B.sub.2O.sub.3, >0-5 mol. % SnO.sub.2, and >0-20 mol. % of at least one alkali oxide selected from Li.sub.2O, Na.sub.2O, K.sub.2O, Rb.sub.2O, and Cs.sub.2O, such that the composition has a Young's Modulus less than 64 GPa.

A borosilicate-based composition, including: 50-85 mol. % SiO.sub.2, 10-40 mol. % B.sub.2O.sub.3, >0-5 mol. % SnO.sub.2, and >0-20 mol. % of at least one alkali oxide selected from Li.sub.2O, Na.sub.2O, K.sub.2O, Rb.sub.2O, and Cs.sub.2O, such that the composition has a Young's Modulus less than 64 GPa.

A method for homogenizing glass includes the method: providing a cylindrical blank composed of the glass having a cylindrical outer surface that extends along a longitudinal axis of the blank between a first end face and a second end face, forming a shear zone in the blank by softening a longitudinal section of the blank and subjecting it to a thermal-mechanical intermixing treatment, and displacing the shear zone along the longitudinal axis of the blank. To enable a radial mixing within the shear zone in addition to the tangential mixing with the lowest possible time and energy input, starting from this method, cylindrical sections of the blank are adjacent to the shear zone on both sides, the first cylindrical section having a first central axis and the second cylindrical section having a second central axis, the first central axis and the second central axis being temporarily non-coaxial with each other.

A method for homogenizing glass includes the method: providing a cylindrical blank composed of the glass having a cylindrical outer surface that extends along a longitudinal axis of the blank between a first end face and a second end face, forming a shear zone in the blank by softening a longitudinal section of the blank and subjecting it to a thermal-mechanical intermixing treatment, and displacing the shear zone along the longitudinal axis of the blank. To enable a radial mixing within the shear zone in addition to the tangential mixing with the lowest possible time and energy input, starting from this method, cylindrical sections of the blank are adjacent to the shear zone on both sides, the first cylindrical section having a first central axis and the second cylindrical section having a second central axis, the first central axis and the second central axis being temporarily non-coaxial with each other.

A method for producing a high silicate glass substrate, includes: (1) obtaining a glass precursor containing, as represented by mol % based on oxides, 60% to 75% of SiO.sub.2, 0% to 15% of Al.sub.2O.sub.3, 15% to 30% of B.sub.2O.sub.3, 0% to 3% of P.sub.2O.sub.5, and 1% to 10% in total of at least one selected from R.sub.2O and R′O; (2) applying first heat treatment to the glass precursor to cause phase separation so as to obtain a phase-separated glass; (3) applying acid treatment to the phase-separated glass to make the phase-separated glass porous so as to obtain a porous glass; (4) drying the porous glass so that a rate of change in mass reaches 10% to 50%; and (5) applying second heat treatment to the porous glass to sinter the porous glass so as to obtain a high silicate glass substrate.

A method for producing a high silicate glass substrate, includes: (1) obtaining a glass precursor containing, as represented by mol % based on oxides, 60% to 75% of SiO.sub.2, 0% to 15% of Al.sub.2O.sub.3, 15% to 30% of B.sub.2O.sub.3, 0% to 3% of P.sub.2O.sub.5, and 1% to 10% in total of at least one selected from R.sub.2O and R′O; (2) applying first heat treatment to the glass precursor to cause phase separation so as to obtain a phase-separated glass; (3) applying acid treatment to the phase-separated glass to make the phase-separated glass porous so as to obtain a porous glass; (4) drying the porous glass so that a rate of change in mass reaches 10% to 50%; and (5) applying second heat treatment to the porous glass to sinter the porous glass so as to obtain a high silicate glass substrate.

The present invention relates to a substrate carrier for accommodating and transporting a substrate, to a changing station comprising such a substrate carrier as well as to a method for treating a substrate.

The present invention relates to a substrate carrier for accommodating and transporting a substrate, to a changing station comprising such a substrate carrier as well as to a method for treating a substrate.

A fire blasting device for manufacturing a medical glass container prevented from breakage and deformation. A glass container is placed on the outer peripheral surface of each of a first roller and a second roller, which are disposed side by side in such a manner that the axis lines are parallel to each other. The axis line of the glass container is parallel to the axis lines of the first roller and the second roller. The entire outer peripheral surface in an inner surface of the glass container corresponding to a region deteriorated by processing is made to abut on the outer peripheral surface of each of the first roller and the second roller. A flame is ejected from a point burner to the region deteriorated by processing in the inner surface of the glass container while rotating the glass container by rotating the first roller and the second roller around the axis lines.

A fire blasting device for manufacturing a medical glass container prevented from breakage and deformation. A glass container is placed on the outer peripheral surface of each of a first roller and a second roller, which are disposed side by side in such a manner that the axis lines are parallel to each other. The axis line of the glass container is parallel to the axis lines of the first roller and the second roller. The entire outer peripheral surface in an inner surface of the glass container corresponding to a region deteriorated by processing is made to abut on the outer peripheral surface of each of the first roller and the second roller. A flame is ejected from a point burner to the region deteriorated by processing in the inner surface of the glass container while rotating the glass container by rotating the first roller and the second roller around the axis lines.