Coal pitch, dị mkpụmkpụ maka coal tar pitch, coal tar distillation nhazi mgbe mwepụ nke mmiri mmiri distillate fọdụrụnụ, bụ nke a ụdị artificial asphalt, n'ozuzu maka viscous mmiri mmiri, ọkara siri ike ma ọ bụ siri ike, nwa na-egbu maramara, n'ozuzu nwere carbon 92. ~ 94%, hydrogen banyere 4 ~ 5%. Kọl...
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