Standard Reference HGI index ASTM D409

Standard Reference HGI index ASTM D409
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Standard Reference HGI index ASTM D409

HGI Reference Materials ASTM Standard, Set of 4 Value ( + / - 40; 60; 80; 100 indeks value HGI) .
HGI Standard biasa digunakan dalam analisa kekerasan babubara atau kemampuan batubara untuk bertahan dari tekanan. 

Tersedia juga Standard lain, seperti
HGI Standards ACIRS
Proximate Standard ACIRS G4
Standard Sulfur Leco
Standard Sulfur Alpha Resources

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