According to ISI, bitumen is classified into A. 2 grades B. 4 grades C. 8 grades D. 10 grades

According to ISI, bitumen is classified into 8 grades. The grades are based on the penetration of the bitumen, which is a measure of its hardness. The higher the penetration, the harder the bitumen. The 8 grades of bitumen are:

• Grade 1: Penetration 100-150
• Grade 2: Penetration 150-200
• Grade 3: Penetration 200-250
• Grade 4: Penetration 250-300
• Grade 5: Penetration 300-350
• Grade 6: Penetration 350-400
• Grade 7: Penetration 400-450
• Grade 8: Penetration 450-500

Bitumen is a sticky, black or brown substance that is produced from petroleum. It is used in a variety of applications, including road construction, roofing, and waterproofing.