The Association of test and material property characterization of coal as the United States has four descending categories hierarchy that has the most to the least amount of carbon is anthracite bikini 2 Minas. SAP Business 2 Minas and lignite
Testing and Materials Association of the United States has identified four coal in descending order from the highest to the category with the lowest carbon anthracite, bituminous coal and lignite, sub-bituminous coal.
Association test and material of the United States by coal 4 hierarchy. The sort of type carbon most to least is Anthracite bituminous coal. ทูมิน sub Bi modulus and lignite