IS 383 is the Bureau of Indian Standards (BIS) specification titled "Coarse and Fine Aggregates for Concrete — Specification." Published originally in 1970 and revised in 2016, it sets the minimum quality requirements for all sand and aggregates used in concrete construction in India. If the sand or aggregate used in your construction does not meet IS 383, the resulting concrete may be weak, prone to cracking, or structurally unsound.
Particle size distribution (grading): The standard defines acceptable size ranges (from 150 microns to 4.75mm for fine aggregate) and how the material should be distributed across those sizes. A badly graded sand creates voids in concrete, reducing strength.
Silt and clay content: IS 383 limits silt/clay to below 3% (for natural sand) to 8% (for manufactured sand). High silt content weakens the cement-aggregate bond.
Moisture absorption: Affects the water-cement ratio of the concrete mix.
Organic impurities: Organic matter interferes with cement hydration.
Shape and surface texture: Affects workability and bond strength.
Ask for the EDCAE (Erode District Civil Engineers Association) or similar accredited lab test certificate. The certificate should show the batch tested, date of testing, specific parameter values (silt content, grading curve, etc.), and confirm IS 383 compliance. Reputable suppliers like Eswara Sand provide this certificate on request for every supply. If a supplier refuses or cannot provide this document, that is a strong signal to look elsewhere.
A substandard 10-load supply might save ₹5,000. A structural failure costs 100 times that — in money, time, and safety. IS 383 certification is not bureaucracy for its own sake. It is the guarantee that the material going into your building's foundations, columns, and beams will perform as the structural engineer designed for. Always insist on it.
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