Plastic refractories are firebricks in plastic putty-like form which can be installed by ramming the plastics with a wooden hammer or air rammer into any shapes required. After installation, it is baked with operation temperature of the furnace itself (over 1,000°C) to form the tough walls. Castables are refractory cements which are mixed with the proper amount of water for installation. May be poured into frames or trowelled as is the case with ordinary cement. After installation by whichever method, it hardens to a sufficient strength. From among various types of products, the most common products are listed below. THERVEK C (Casting / Trowelling) - Cement castables Easy installation and excellent general-purpose characteristics. Enables easy application of refractory lining walls with superior refractoriness. Has low thermal conductivity in comparison with shaped refractories, and can contribute to energy saving. Also offers greater resistance to thermal spalling than shaped refractories. Offers an extensive lineup of products with maximum service temperatures ranging between,1350°C and 1800°C, and can be used for all manner of equipment.