The rate at which this change takes place is ex- tremely slow; however, the lower the temperature (below 13.2 C) the faster the rate. Accompanying this white tin-to-gray tin transformation is an in- crease in volume (27 percent), and, accordingly, a decrease in density (from 7.30 g/cm3 to 5.77 g/cm3). Consequently, this volume expansion results in the disintegration of the white tin metal into a coarse powder of the gray allotrope. For normal subam- bient temperatures, there is no need to worry about this disintegration process for tin products, due to the very slow rate at which the transfor- mation occurs.