Comparison of the binding behavior of poly(vinyl alcohol) with varying molecular weight and poly(vinyl acetate) in compositions for white body plates obtained by isostatic pressing.

Over the past few years, the isostatic pressing method has been successfully applied for the prodn. of refractories and tableware. This method may be used for the prodn. of practically all shapes of plates, and also for more complex non-sym. pieces. This procedure leads to a rapid expansion of the piece after pressing, possibly resulting in damage. To avoid this problem, binding agents are added to the bodies which are capable of combating the expansion phenomenon. The effects of three types of poly(vinyl alc.) (varying mol. wt.), added in three different quantities, and poly(vinyl acetate) on this expansion phenomenon in the isostatic pressing of plates were examd.