Refractory Castables

G R Heat Castable are produced in three grades designed as G R Heat - A, G R Heat - K and  G R Heat - C. All contain the special high purity, high alumina refractory binder. typical properties of these castable, including data on strength, conductivity and chemical composition are provided in the table at the bottom of this page. Each grade of G R Heat castable is used for a specific service temperature and environment.

G R Heat - A

G R Heat - A is a high purity, high alumina castable of exceptional quality with an alumina content of over 90% and with very low silica and iron contents. Hence, it is used for service temperatures up to 1750°C and can resist attack from process gas atmospheres containing carbon monoxide and hydrogen.

G R Heat - A is particularly suitable for use in coke ovens; gas production plants as well as gasification plants and is also used:

  • In the iron and steel industry for lining blast furnaces and for skew backs, ports and roof lining of arc-melting furnaces
  • In the non-ferrous metal industry to line reverberatory furnaces where high purity aluminum is produced
  • In reactors of refineries as well as in fertilizer plants where castable with a high degree of resistance to carbon monoxide, hydrogen and ammonia are desired
  • For lining of preheaters /converters and on all transfer lines

G R Heat - K

G R Heat - K, which has an alumina content of 60%, can be used for service temperatures up to 1600°C. This castable also has a low iron content and can resist carbon monoxide attack.

G R Heat - K can be used in:

  • Blast furnaces
  • Foundries
  • Boiler industry stoker arches
  • Locations where reducing atmospheres are encountered
  • Construction of soak pit covers, forge furnaces, tunnel kilns, heat treatment furnace car tops as well as electro-phosphorus furnaces

G R Heat - C

G R Heat - C is a castable with about 50% alumina and serves as a general purpose high temperature castable required for service temperatures up to 1500°C.

G R Heat - C is suitable for use in:

  • Iron and steel industry
  • Semi-permanent foundries
  • Annealing furnaces
  • Stress relieving furnaces
  • Construction of special refractory shapes, monolithic convection sections in water tube boilers, ash-hopper linings and incinerator arches

Packaging and Storage

G R Heat castable is available in HDPE packages of 50 kg. The shelf life of G R Heat castable is six to nine months under ideal storage conditions.

PropertiesG R Heat - AG R Heat - KG R Heat - C
Recommended Service temp. (°C) max.175016001500
Refractoriness (°C) min.180016801650
Dry Density (kg/m3) min.280022002100
Linear change (%) max. 3 hours±1 @ 1550°C±1 @ 1550°C±1 @ 1550°C
CCS (kg/cm2 min. @ 110°C550350
Grain Size (mm) max.5
Chemical Analysis
Al2O3 (%) min.906050
Fe2O3 (%) max0.81.01.5


  • CCS and Linear Change values are on 4x4x16 cm prisms
  • Provided above are average test data, subject to reasonable variations

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