Choosing Sand for Mortar and Plaster: Cracking, Adhesion and Workability
Unsuitable sand leads to cracked, detached plaster. Learn ASTM C144 limits, how fines and clay act, and how to select sand for masonry mortar and plaster.
0–6 mm
Sand
Mortar Sand
Mortar sand
Finer sand with a grading suited to masonry mortar, plaster and finishing work.
0–4.75 mm
Properties and technical role
Mortar needs a sand that gives good adhesion and workability in thin layers. This is why its grading is finer than concrete sand and its maximum particle size more limited.
A balanced share of fine particles reduces mortar shrinkage and cracking and gives a more even finish.
Quality information
| Method | Test |
|---|---|
| ASTM C136 | Sieve analysis |
| ASTM C117 | Material finer than the 75 µm sieve |
Reference gradingASTM C144
Grading limits for natural mortar sand
Limits on percent passing each sieve, based on ASTM C144. These are limits from the reference standard, not test results from a shipment. The current edition of the standard and the project specification are the final authority.
4.75 mm100%
2.36 mm95–100%
1.18 mm70–100%
600 µm40–75%
300 µm10–35%
150 µm2–15%
75 µm0–5%
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Inquire about Mortar sand
The grading on offer, stock and supply terms for this product are confirmed at the time of inquiry.