Metode ASTM (American Standard Testing Material)

Metode ASTM (American Standard Testing Material)

         Dalam penentuan jenis tingkatan batubara menurut klasifikasi ASTM ini didasarkan atas persentase karbon padat dan nilai kalori (dalam btu/lb), yang dihitung berdasarkan basis Dry Mineral Matter Free (dmmf)

Tabel Klasifikasi Batubara Berdasarkan ASTM

Class	Group	Fixed Carbon % , dmmf		Volatile Matter Limits, % , dmmf		Calorific Value Limits BTU per pound (mmmf)
		≥	Less Than	Greater Than	≤	≥	Less Than	Agglomerating Character
I. Anthracite	1.Meta-anthracite	98			2			Non- agglomerating
	2.Anthracite	92	98	2	8
	3.Semianthracite C	86	92	8	14
II. Bituminous	1.Low volatile bituminous coal	78	86	14	22			Commonly Agglomerating
	2.Medium volatile bituminous coal	69	78	22	31
	3.High volatile A bituminous coal		69	31		14000
	4.High volatile B bituminous coal					13000	14000
	5.High volatile C bituminous coal					11500	13000	Agglomerating
						10500	11500
III. Sub- bituminous	1.Subbituminous A coal					10500	11500	Non- agglomerating
	2.Subbituminous B coal					9500	10500
	3.Subbituminous C coal					8300	9500
IV. Lignite	1.Lignite A					6300	8300
	1.Lignite B						6300

Sumber : Annual Book of ASTM Standard