SiO2 CaCO3 Na2CO3 1,500 50 20 m 12 38 0 2 8 12 13 20 2. 4 2.7 2004 3 375 57
70 10 58 2004 3 375
30 3.05 4.77 15 Sergey Bubka 6.14 glass fiber reinforced plastics GFRP 2004 3 375 59
60 2004 3 375 70
90 2820 10 10 1.53 4.59 7.14 1.53 2004 3 375 61