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Penetration bitumen, also known as paving grade bitumen, is a viscous, black, and highly sticky substance derived from petroleum refining. It is classified based on its penetration value, which refers to the depth (in tenths of a millimeter) to which a standard needle penetrates the bitumen sample under specified conditions of temperature and loading. Penetration bitumen 60/70 is characterized by its medium penetration value and specific viscosity range, making it suitable for a wide range of applications in asphalt mixtures and road construction.
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