Table 2.2. Incremental Material Requirements of SPS System Material Portion of U.S. Annual Production, Za Silicon Design^ Gallium Arsenide Design^ GFRTPb NA NA Stainless Steel NA NA Glass NA NA Silicon NA NA Copper 0.12 0.07 Aluminum 1.24 1.28 Silver 0.42 17.02 Molybdenum 0.002 0 Mercury 73.7 73.7 Tungsten 1.63 1.63 Steel 0.23 0.23 Concrete0 2.10 2.10 Gallium Arsenide NA NA Titanium 0.04 0.04 Ceramics NA NA Mise, and Organics NA NA Argon 10.28 2.44 Hydrogen 53.70 30.61 Oxygen 15.95 8.19 ch4 NA NA Sapphire NA NA Teflon NA NA Krypton NA NA aUnless otherwise indicated, materials requirements from Ref. 2.8.1, U.S. Production from Ref. 2.8.4. Values given are for one satellite. Note: The SPS materials requirements are for the total system and the production rates are U.S. annual totals; caution must be used in interpreting these data. ^Glass fiber reinforced thermo plastic. cProduction measured as cement. NA - Not available.
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