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Geometric characteristic data of rasching rings: Size(mm) d*h*±smm specific area(m2/m3) void volume(m3/m3) 6 6*6*2 789 0.73 10 10*10*2 460 0.7 15 15*15*2 350 0.7 25 25*25*2.5 235 0.78 Packing in plastic bag or iron barral or carbon box