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 600 micro meter - 1700 micro meter & a minimum of 40 percent should be retained on a 850 micro meter Sieve, conforming to IS-460(Part-1)1985. [ Warranty Period: 30 Months after the date of delivery ] ]
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