Crystal Growth & Specialty Glass Melting


Rath offers a broad line of high-purity refractory materials suitable for crystal growth and glass melting processes up to 1850°C. Rath materials are made using the highest quality synthetic raw materials, ensuring the lowest possible level of impurities. These raw materials and specialized processing result in excellent resistance to the highly corrosive environments and atmospheres experienced in these processes. The Rath line includes dense refractories, insulating refractories, and fiber-based insulation.


DENSE ALUMINA REFRACTORY GRADES


KORRATH® K-99

  • >99.5+% purity, with low silica content, 196 lbs/ft³, available in pressed or cast shapes

KORRATH® K-91

  • High-Purity Mullite bonded alumina, with excellent thermal shock resistance, 180 lbs/ft³


INSULATING ALUMINA REFRACTORY GRADE


PORRATH® FL34-15

  • Bubble alumina, ASTM Grade 34 Insulating brick, > 99.5% purity, low silica content, 95 lbs/ft³ standard density, good thermal shock resistance, available in densities up to 125 lbs/ft³


ALUMINA FIBER GRADES


KVR

  • Vacuum-formed 98% alumina fiber grade, organic-free, available in various densities from 15 to 90 lbs/ft³
  • Boards, cylinders, and other shapes are available


ALTRA® MAT 97

  • 97% alumina fiber, polycrystalline, with very low shot content
  • Available in mat (3.5, 5 and 6 lbs/ft³) and edge grain strip module (6 to 10 lbs/ft³ density) forms


MULLITE FIBER GRADES


KVS

  • Vacuum-formed, 80% total alumina content, no free silica, organic-free, maximum thermal shrinkage resistance up to 1800°C, available in various densities from 15 to 90-lbs/ft³
  • Boards, cylinders, and other shapes are available


ALTRA® MAT 97

  • Mullite (72% alumina) fiber, polycrystalline, with very low shot content
  • Available in mat (3.5, 5 and 6 lbs/ft³) and edge grain strip module (6 to 10 lbs/ft³ density) forms
  • Best fiber in resistance to thermal shrinkage



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