US Patent 8188382 Leadthrough for passing conduits through constructional components

A leadthrough for passing conduits (6) through a constructional component (5) includes a circumferentially closed housing (12), an insert (21) of intumescent material located in the housing (12), and a first and second diaphragm-shaped sealing members (31, 36) formed, respectively, of an elastic material, and a textile flat material, each having a through-opening (32, 37) and both located in the housing (12), with the second sealing member (36) having a transition temperature of at least 600° C.