According to ISI, bitumen is classified into
A. 2 grades
B. 4 grades
C. 8 grades
D. 10 grades
Answer: Option D
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According to the old ISI (IS:73) penetration grading system, bitumen is classified into 6 grades:
1. S-35 (30/40 penetration)
2. S-45 (40/50 penetration)
3. S-55 (50/60 penetration)
4. S-65 (60/70 penetration)
5. S-90 (80/100 penetration)
6. S-200 (180/200 penetration)