A pressing arrangement for hot isostatic pressing of substances, comprising: a pressure vessel including top and bottom end closures (8, 9); a furnace chamber provided inside the pressure vessel and being adapted to hold articles such as containers comprising substances to be treated by hot isostatic pressing, a heat insulated casing including a heat insulating portion, a housing and a bottom heat insulating portion; a guiding passage being defined by said heat insulating portion and said housing, said guiding passage communicating with the furnace chamber and being a part of an outer cooling loop, wherein said pressure medium is guided toward said top closure in said guiding passage; at least one upper hole arranged substantially at the same height as said bottom heat insulating portion to allow pressure medium to flow into said guiding passage from said furnace chamber; and at least one substance capturing module (35, 41, 43) adapted to capture substances carried by said pressure medium, characterized in that said at least one substance capturing module (35, 41, 43) is arranged such that substantially all pressure medium flowing out from said furnace chamber passes said at least one substance capturing module (35, 41, 43) before making contact with said pressure vessel including said top and bottom closures (8, 9), wherein said at least one substance capturing module (35, 41, 43) is arranged in said outer cooling loop within said housing such that pressure medium flowing out from said furnace chamber is forced to pass said at least one substance capturing module via said guiding passage before making contact with said pressure vessel. a pressure vessel including top and bottom end closures (8, 9); a furnace chamber provided inside the pressure vessel and being adapted to hold articles such as containers comprising substances to be treated by hot isostatic pressing, a heat insulated casing including a heat insulating portion, a housing and a bottom heat insulating portion; a guiding passage being defined by said heat insulating portion and said housing, said guiding passage communicating with the furnace chamber and being a part of an outer cooling loop, wherein said pressure medium is guided toward said top closure in said guiding passage; at least one upper hole arranged substantially at the same height as said bottom heat insulating portion to allow pressure medium to flow into said guiding passage from said furnace chamber; and at least one substance capturing module (35, 41, 43) adapted to capture substances carried by said pressure medium, characterized in that said at least one substance capturing module (35, 41, 43) is arranged such that substantially all pressure medium flowing out from said furnace chamber passes said at least one substance capturing module (35, 41, 43) before making contact with said pressure vessel including said top and bottom closures (8, 9), wherein said at least one substance capturing module (35, 41, 43) is arranged in said outer cooling loop within said housing such that pressure medium flowing out from said furnace chamber is forced to pass said at least one substance capturing module via said guiding passage before making contact with said pressure vessel.