Rathloc® is an innovative brick design eliminating the need for mortar. It decreases maintenance costs, allows for easier re-assembly, and improves overall kiln car service life. Rathloc® or Noppenstein bricks feature Buttons and Dimples that allow for easy interlocking designs and construction. Much like small toy interlocking bricks, Rathloc® allows for rapid assembly and dis-assembly.

Rathloc® is hydraulically-pressed, high-fired brick produced in Krummnausbaum, Austria and Milledgeville, Georgia. It is produced for load-bearing and insulating applications. For load-bearing brick, Rath typically offers SILRATH® AK 70 or KORRATH® C901HT. The Silrath® product line features andalusite-based bricks with excellent thermal shock resistance. The Korrath® product line is tabular or fused alumina-pressed bricks, characterized by excellent creep resistance in combination with good thermal shock resistance. For insulating brick, we offer PORRATH® FL27-12 or PORRATH® Bubble Alumina FL33-13 for applications up to 1800°C. The Porrath® product line for Rath features pressed insulating bricks in ASTM grades 27, 32, 33, and 34.


Rath offers kiln car design and construction services. Many customers send the empty chassis to Rath for the initial construction. After the design has been established, additional kiln cars are built upside-down on pallets to be sent to the customer for assembly. This enables the customer to unload the pallet and lay up the brick on the car chassis in his or her shop. The combination of mortar-free, precut, and sized bricks enable the customer to decrease construction time, reduce labor costs, and extend service life. If the kiln car design is too large for individual pallets, Rath develops installation drawings and will send supervision for the initial installations.


Another design feature is that Rathloc® allows for lightweight fiber to be used in the lower layers of the kiln car and then the upper sections span over the light-weighted areas, thus reducing firing load and mass.


Rathloc® is available for continuous and periodic kilns and, based on customer experiences, both have reduced maintenance labor cost, reduced replacement and spare parts, and reduced kiln downtime since pressed bricks hold up better than cast shapes and IFB.

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