Classification of refractory products

Due to the large variety of available refractory materials, it is possible to approach its classification from different angles. 

We will describe below the four principal methods of classification providing a quick presentation of a refractory product. 

There are basically three main families of refractories  

By definition, light insulating products have a total porosity greater than 45% in volume. Below this value, a refractory is considered to be dense. 

The essential property of an electrofused refractory is its excellent corrosion resistance due to its extreme compactness (its porosity is less than 5% and often even 3%) and high refractoriness of its constituent muddled crystals. On the other hand, it is very sensitive to thermal shocks, thus limiting its main utilization to glass furnaces. 

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