Many spacecraft applications contain optical and other systems that are affected by out gassing of volatile materials. Therefore, all materials must be categorized and selected for low out gassing.

To control the materials used in the space power supply, a materials application usage list is generated which contains all items used within the power supply, as well as all items used to assemble or clean the power supply. This list also lists the TVCM (total volatile condensing mass) of each item.