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#Penetration Grade Bitumen ( like Bitumen 60-70) is classified using penetration property. It is a kind of bitumen, which is provided during the process of oxidation of vacuum bottom (the bitumen Definition: production feed-stock that derives from distillation tower residue in vacuum oil refineries) at bitumen production units in a manner that its penetration point (kind of test to indicate the hardness of #bitumen) becomes between 60 70.
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