>The P120C builds upon the P80's design, utilizing a carbon fibre casing constructed via filament winding and fabric deposition techniques. It houses a 143.6 tonnes (317,000 lb) of HTPB 1912 propellant, a blend of 19% aluminium powder, 69% ammonium perchlorate with 12% of hydroxyl terminated polybutadiene binder. The motor's 25 centimetres (9.8 in) thick walls require a 3,500 kilometres (2,200 mi) of carbon fiber, wound over 33 days in a climate-controlled environment.
Explain why this material cannot be used to make a space elevator.