Comments on Insulating Bricks Data

These products are sintered refractory insulating bricks, which are plastically moulded and fired in high temperature kilns. Since the products are manufactured from mixture of different raw materials, the properties are subject to variations as the raw material themselves may 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 only manufactured by plastic moulding method.

 

Raw Material Base: This is the essential raw material conferring particular properties to the mixture.

 

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 ASTM C 573.

 

Bulk Density: Determined according to ASTM C - 134.

 

Cold Crushing Strength: Carried out according to ASTM C - 93.

 

Apparent Porosity:  Carried out as per ASTM C 20.

 

Pyrometric Cone Equivalent: The test is done as per ASTM C - 24.

 

Permanent Linear Change: Determined according to ASTM C - 210.

 

Thermal Conductivity: Determined as per water calorimetric method. SPECIFICATION

 

For Shaped Bricks

The data relate to machine moulded standard bricks only.

For shaped items, specification will be same as standard bricks except the following size tolerance

Size Tolerance:  ():-.) or ± 1.5 mm whichever greater