Abstract: A process for preparing a glass container that includes: providing a glass tube with a first portion, a second portion, and a longitudinal axis (Ltube); holding the first portion in a first clamping chuck and the second portion in a second clamping chuck; rotating the glass tube around the longitudinal axis (Ltube); heating, via a heater, the glass tube above a glass transition temperature; separating the first and second portions from one another by pulling apart along the longitudinal axis (Ltube) while the heated glass tube is still rotating by moving the first and the second chucks away from each other; and moving the heater, while moving the first and second chucks away from each other, so that the heater follows a mass that remains at a circular end region of the first and/or second portion.

Abstract: A process produces a free flowing, silicic-acid-filled, powdered elastomer wherein the silicic acid employed has the properties set out below:(a) SiO.sub.2 content: about 82-91.5% by weight;(b) metallic oxides: about 0.5-3% by weight;(c) loss on ignition (DIN 55 921/2--measured at 100.degree. C.): about 8-15% by weight;(d) moisture (DIN 53 198--measured at 105.degree. C.): about 2-10% by weight;(e) surface area of the primary particles according to BET: about 40-250 m.sup.2 /g;(f) dibutyl phthalate absorption (ASTM D 2414-79) based on measured weight: about 170-290%.(g) linear average of numerical distribution of secondary particles: about 10-2,000 nm;(h) linear average of volume distribution of secondary particles: about 3-30 um;(i) proportion of secondary particles with a diameter of less than 1 um: about 0.01-5% by weightwherein the percentages of parameters (a) to (c), added up together, must yield 100% by weight.