This test method covers the determination of the relative grindability or ease of pulverization of coals in comparison with coals chosen as standards. A prepared and sized sample receives a definite amount of grinding energy in a miniature pulverizer, and the size consist of the pulverized product is determined by sieving. The resultant size consist is used to produce an index relative to the ease of grinding [Hardgrove Grindability Index (HGI)]. Some coals, such as some high-volatile bituminous, subbituminous, and lignite coals, can undergo physical change as the natural or seam moisture is released during handling and preparation.
ASTM D409/D409M-12 History
ASTM D409/D409M-24
$38.00 $76.00
ASTM D409/D409M-16
$41.00 $83.00
ASTM D409/D409M-12e1
$33.00 $67.00
ASTM D409/D409M-12
$33.00 $67.00
ASTM D409/D409M-11ae1
$33.00 $67.00
ASTM D409/D409M-11
$33.00 $67.00
ASTM D409/D409M-11a
$33.00 $67.00
ASTM D409/D409M-09a
$33.00 $67.00
ASTM D409/D409M-09
$34.00 $69.00
ASTM D409-08
$33.00 $67.00
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ASTM D1655-12
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ASTM D4137-82(2012)
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ASTM E724-98(2012)
$44.00 $89.00