Refractory Bricks >> 70% Alumina
Comments on Refractory Bricks Data
These products are sintered refractory dense bricks manufactured by dry pressing method and firing in high temperature kilns. Since these products are manufactured from mixtures of different raw materials, the properties are subject to variations as the raw material may also vary.
The properties shown under typical value column are mean values from quality control figures and the properties under specification column are guaranteed values of the product.
Nature of Bond: The nature of bond may be ceramic, phosphate or chemical in nature. Where several bonds are used together, the bond is designated according to the nature of those bonds which play the dominant role in the fired product.
Shaping: All the values mentioned in the data sheet relate to standard bricks manufactured by dry pressing method.
Raw Material Base: This is the essential raw material conferring particular properties to the brick and shapes.
Max. Service Temperature: The temperature is based on the product being heated on one face only in a clean atmosphere. Heating on more than one face, mechanical load, or the presence of corrosive dust, certain gases or slags will cause the maximum service temperature to alter.
Reversible Thermal Expansion: This test is done as per IS 1528 (PART 19) : 1991.
Chemical Analysis: Carried out according to IS 1527 - 1972.
Bulk Density: Determined according to IS 1528 (PART 12) 1974.
Apparent Porosity: Carried out according to IS 1528 (PART 8) 1974.
Cold Crushing Strength: Carried out according to IS 1528 (PART 4) 1974.
Pyrometric Cone Equivalent: The test is done as per IS 1528 (PART 1) - 1980.
Refractoriness Under Load: Determined according to IS 1528 (PART 2) 1974.
Permanent Linear Change: Determined according to IS 1528 (PART 6) 1974.
Thermal Conductivity: Determined as per water calorimetric method.
Specification For Shaped Bricks
1. The data relate to machine-moulded standard bricks only
2. For shaped items, specification will be same as standard bricks except the following variations :
BD will be lower by 0.10 gm/cc, AP higher by 2 %, CCS lower by 100 kg/cm2 and RUL lower by 20 -QC from the specification values of standard bricks mentioned in data sheet.