The hydrolysis products of hexachlorodisilane (HCDS) show common heat sensitivity and can become shock sensitive under certain conditions. Study of the shock sensitivity has been difficult due to the unpredictable nature of this phenomenon. We have identified the parameters affecting the shock sensitivity of the materials and developed synthetic methods to consistently prepare the hydrolysis products with a high shock sensitivity. We characterized the composition of the hydrolysis products to be [SiOx (OH)(4-2x)](m)-[Si2Oy(OH)(6-2y)](n)(H2O)(o) where x is 0-2, y is 0-3, m is less than n, and o varies. The hydrogen atoms in the silanol groups or absorbed water are the oxidant and the silicon atoms in the Si-Si bonds are the reductant. When the materials are disturbed by a thermal or mechanical impact, fast redox reactions happen to form molecular hydrogen. A sequence of free radical reactions was proposed to explain the shock sensitivity and shock-induced chemical transformation.