This document discusses the use of Birkosit - Dichtungskitt®, a product manufactured by A.I. Schulze Chemotechnische Fabrik e.K., for sealing metal-to-metal joints in flanges and housings. It lists various applications for flanges in apparatus and pressure vessel construction including bolt flanges, bearing races, basket rings, loose flanges, supporting rings, sealing washers, manhole flanges, chamber flanges, smooth flanges, welding neck flanges. It also notes that A.I. Schulze provides flanges according to major international standards in all sizes, focusing on medium and large dimensions, and can also produce flanges according to customer drawings.