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In 1986 Phoenix supplied the world's strongest conveyor belt for underground use. The slope conveyor belt at Prosper II mine in Germany carries raw coal from 800 meters (2,600 gt) underground to the surface while simultaneously on the bottom run washery refuse is brought back underground.
The belt requirements were for 8,000 meters (24,000 ft) of PHOENOCORD St 7500 which has an ultimate tensile strength of 8,200 N/mm or 47,000 piw.
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