Expanded products from clays and shales

2 Expanded Products from Clays and Shales 5.3.6.2.1 Raw Materials 

Materials suitable for the manufacture of expanded clays or shales are those which form a gla.ss-like ( pyroplastic ) phase at high temperatures (ca. 1100 to 1200°C), whose viscosity is so high that gas produced in the product cannot escape and therefore bloats the material. The volume change of a clay granulate as a function of temperature is shown in Fig. 5.3-3. 

Expandable raw materials form a glass-like pyroplastic ) phase at I 100 to I200 C and are expanded by the gases formed at these temperatures 

Additives for increasing bloatability e.g. organic materials, iron oxide, gypsum 

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See also in sourсe #XX -- [ ]

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