Theoretical Aspects of Chemical Attack of Glasses by Water*

A bstract The effects of time and temperature on the chemical attack of glasses by water are represented by the equation; α log N = log θ ‐ b/T + c ; N = attack; θ= time; T = absolute temperature, °K; a, b , and c , are experimentally determined constants. The constant, b , of the equation is independent of the glass composition and of the size and shape of the sample tested and has a value of 5080 for tests of ordinary glass containers. As a time‐temperature function, the equation may be written as log θ= b/T ‐ C , in which form it is useful for estimating the storage or service conditions equivalent to art accelerated test or for calculating the conditions of alternate tests. Data from the literature are used in demonstrating the accuracy and usefulness of the equation.