What is the maximum allowed clay, fine silt, and fine dust content in plastering sand?

It should not exceed 5% by mass as per Clause 6.1.

What is the maximum particle size permitted for plastering sand?

100% of the sand must pass through a 10 mm IS sieve, and at least 95% must pass a 4.75 mm IS sieve (Table 1).

Can sea sand be used for plastering?

Sea sand should generally be avoided unless thoroughly washed to remove salts that cause efflorescence and corrosion.

IS 1542

: 1992

Crushed Stone Fine Aggregate for Use in Construction - Specification

CurrentFrequently UsedSpecificationMaterials Science · Aggregates and Sand

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This standard lays down the requirements for naturally occurring sand, crushed stone sand, and crushed gravel sand used in mortars for internal wall, external wall, and ceiling plastering. It specifies grading limits, physical properties, and permissible limits for deleterious substances to ensure good quality plaster finishes.

Specifies requirements for crushed stone fine aggregate, commonly known as manufactured sand (M-sand), for use in various construction applications.

Quick Reference Values

max silt clay dust by mass5 percent

passing 10mm sieve100 percent

passing 4 75mm sieve95 to 100 percent

passing 150micron sieve0 to 10 percent for natural / 0 to 15 percent for crushed stone

Practical Notes

Sand for plastering must be finer than sand for masonry mortars to achieve a smooth finish and prevent rebound loss.

Excessive clay and silt content (above 5%) can cause drying shrinkage cracks and weaken the plaster.

Ensure sand is free from organic impurities which can interfere with the setting of cement.