This partially frosted glass cylinder for the Petromax HK250 is made of highly heat-resistant borosilicate glass from Schott. For the matting, the quality glass was subsequently processed with a sandblast. The combination of frosted and clear surfaces is ideal for not being dazzled by the bright light of the lamp, depending on the viewing angle. At the same time, the incandescent mantle and the spirit bowl can be seen through the clear part of the glass cylinder.