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Physical properties Brand Gg-0.7a Gg-0.7b Gg-0.6 Gg-0.5a Gg-0.5b Gg-0.4 Index Bulk density 0.7 0.7 0.6 0.5 0.5 0.4 Compressive strength mpa 2.45 1.18 0.78 0.78 0.59 0.78 Permanent line chang 900 Conductivity coefficient 0.2 0.21 0.17 0.15 0.16 0.13
