Abstract: A method and a device (50) for removing fragments and/or particles from containers, such as in particular glass tubes (5), provides means for adjusting the electrostatic force (40) in the tubes (5) and means for removing (60) of the fragments. The means for removing (60) can comprise a jet of fluid, of measured speed, put in the containers (5) by a nozzle (2), whereas the means for adjusting the electrostatic force (40) can comprise an element (1) for putting an electrically conducting fluid (8) with a measured resistivity in the containers (5). This way, the fluid (8), for example ionized air, acts in order to reduce and/or eliminate the electrostatic charge, and therefore the electrostatic force, between the fragments (30) and the surface of the containers, assisting the removal by means of jets of fluid or by suction means.

Abstract: Use of a glass composition to make a tubular glass body that is adapted to form a glass-metal joint in a tubular solar collector. The composition is a borosilicate glass having a dilatometric chart with a hard segment and a soft segment hysteresis where the soft segment glass transition temperature is less than the hard segment glass transition temperature for a temperature difference ?T higher than 20° C. comprising 5% to 8% Na2O, 0.1% to 3% K2O, 0.1% to 1.5% CaO, 5% to 7.5% Al2O3, 70% to 75% SiO2, and 11.6% to 13.7% B2O3.

Abstract: A glass composition for a tubular glass body used to form a glass-metal joint in a tubular solar collector. Includes a borosilicate glass having a dilatometric chart with a hard segment and a soft- segment hysteresis. The soft segment glass transition temperature is less than the hard-segment glass transition temperature for a temperature difference ?T higher than 20° C. The composition comprises: 5% to 8% Na2O, O, 1% to 3% K20, O, 1% to 1.5% CaO, 5% to 7.5% Al203, 70% to 75% Si02, 11.6% to 13.7% B203, Owing and owing to the choice of the B203 in the range indicated, in combination with the other components, there is a glass transition temperature lower than other borosilicate glasses. The remarkable difference between the soft and hard segments glass transition temperatures make it possible to obtain a tubular glass body particularly suitable for a solar collector.

Abstract: A method and a device (50) for removing fragments and/or particles from containers, such as in particular glass tubes (5), provides means for adjusting the electrostatic force (40) in the tubes (5) and means for removing (60) of the fragments. The means for removing (60) can comprise a jet of fluid, of measured speed, put in the containers (5) by a nozzle (2), whereas the means for adjusting the electrostatic force (40) can comprise au element (1) for putting an electrically conducting fluid (8) with a measured resistivity in the containers (5). This way, the fluid (8), for example ionized air, acts in order to reduce and/or eliminate the electrostatic charge, and therefore the electrostatic force, between the fragments (30) and the surface of the containers, assisting the removal by means of jets of fluid or by suction means.