Item Description: coarse sand ( minimum zone- iii ), specification as per clause- 30f- is- 6586- 1972/ irs- bi/ 2021 ( reprinted- 2008 ), grain size of ( sharp coarse sand ) should be between to between 600 micro metre & 170 0 micro metre & a minimum of 40 percent should be retained on a 850 micro metre sieve, conforming to is- 460 ( part- 1 ) 1985. [ warranty period: 30 months after the date of delivery ]

Kolkata, West Bengal, India