The glass composition of the present invention includes the following components, expressed in mass %: 70% to 88% of SiO2; 6% to 18% of B2O3; 0. 001% to 10% by weight of nanostructure and a polyfluorene polymer. In contrast to dilute aqueous lubricants, the lubricants of the invention provide drier lubrication of the conveyors and containers, a cleaner conveyor line and reduced lubricant usage, thereby reducing waste, cleanup and disposal problems. A second field plate on the second spacer layer is connected to the gate. The hatch is advanced and cleared away from the portal through use of a hatch operating mechanism that employs an extendable cylinder assembly to advance the hatch and a rotational assembly operably connected to the telescopic assembly to rotate the hatch so as to clear the portal.