A device for testing material properties of material samples, in particular for testing outgassing of volatile constituents of a material sample, - having a housing containing a number of recesses for accommodating a sample container containing material sample, - having a heating apparatus for heating the material sample to a predetermined test temperature, - having a testing surface covering the sample container and cooled to a cooling temperature, such that a deposit of the material sample forms on the testing surface, characterized in that the heating apparatus has a heatable solid or modular metal block, which completely surrounds the recess except for an opening region, - having an external cooling device, which is connected to a cooling medium distributor unit via lines conveying coolant, wherein the cooling medium distributor unit is in each case coupled via a feed line and a return line to cooling members and wherein the testing surface is coupled to the cooling member through which the cooling medium flows for cooling thereof to a predetermined temperature, - in that the cooling medium distributor unit has a base plate, a cover plate and narrow sides for forming an inlet chamber for feed of the cooling medium coming from the external cooling device and for forming an outlet chamber for return of the cooling medium coming from the cooling member, wherein the cover plate has a line port associated with the inlet chamber for the feed line coming from the external cooling device and line ports associated with the inlet chamber for the feed lines leading to the cooling members on the one hand and a line port associated with the outlet chamber for the return line extending to the external cooling device and line ports associated with the outlet chamber for the return lines leading from the respective cooling members on the other hand, wherein on the narrow sides of the inlet chamber and the outlet chamber walls (34, 35) tapering vertically upwards are provided which converge at the level of a port (36, 37) for the vent valve. - having a housing containing a number of recesses for accommodating a sample container containing material sample, - having a heating apparatus for heating the material sample to a predetermined test temperature, - having a testing surface covering the sample container and cooled to a cooling temperature, such that a deposit of the material sample forms on the testing surface, characterized in that the heating apparatus has a heatable solid or modular metal block, which completely surrounds the recess except for an opening region, - having an external cooling device, which is connected to a cooling medium distributor unit via lines conveying coolant, wherein the cooling medium distributor unit is in each case coupled via a feed line and a return line to cooling members and wherein the testing surface is coupled to the cooling member through which the cooling medium flows for cooling thereof to a predetermined temperature, - in that the cooling medium distributor unit has a base plate, a cover plate and narrow sides for forming an inlet chamber for feed of the cooling medium coming from the external cooling device and for forming an outlet chamber for return of the cooling medium coming from the cooling member, wherein the cover plate has a line port associated with the inlet chamber for the feed line coming from the external cooling device and line ports associated with the inlet chamber for the feed lines leading to the cooling members on the one hand and a line port associated with the outlet chamber for the return line extending to the external cooling device and line ports associated with the outlet chamber for the return lines leading from the respective cooling members on the other hand, wherein on the narrow sides of the inlet chamber and the outlet chamber walls (34, 35) tapering vertically upwards are provided which converge at the level of a port (36, 37) for the vent valve.