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Refractory cement

Refractory cements correspond to a bond used in unshaped refractory material manufactured by the refractory industry.
According to the ISO 1927, refractory castable (refractory concrete) are prepared with a number of raw materials, which are bonded together with bonds, including hydraulic bond that sets and hardens when mixed with water.
Also called refractory cements, those hydraulic bonds possess different grades. Calcium Aluminates are part of refractory cements and are used in all castable families:
- Regular Cement Castable or Conventional Castable
- Medium Cement Castable
- Low Cement Castable
- Ultra Low Cement Castable

Refractory cements are mixed with refractory aggregates (bauxite, tabular alumina, White Fused Alumina, Brown Fused Alumina, andalusite, silimanite, chamotte, Alag, perlite, vermiculite, reclaimed material, bubble alumina…) and used with various installation techniques:
- dry gunning
- wet gunning or shotcrete
- vibration casting
- self-flow

The selection of these refractory cements is based on the typical service temperature (the examples given below concern dense castables)
- 1150 – 1400°C for Ciment Fondu®
- 1250 – 1550°C for SECAR® 51
- 1500 – 1800°C for SECAR® 71, SECAR® 712
- 1550 – 2000°C for SECAR® 80, SECAR Plenium®, SECAR Xeniom™

A new family of refractory cement consists in calcium-magnesium-aluminates and the first product to be sold on the market is called CMA 72

Technical articles on www.secar.net are available on calcium aluminates


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