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Fat lime versus hydraulic lime
Short answer
Fat lime is made from pure limestone, slakes rapidly with heat and expansion, sets in air, and is white. Hydraulic lime contains 5–30% clay, slakes slowly, sets under water, has higher strength, and is grey or yellowish.
Differentiate between fat lime and hydraulic lime.
| Basis | Fat lime | Hydraulic lime |
|---|---|---|
| Raw material | Pure limestone (over 95% CaCO₃) | Limestone with 5-30% clay |
| Slaking | Slakes rapidly with heat and large expansion | Slakes slowly with little heat |
| Setting | Sets in air by carbonation, slowly | Sets in water and damp places |
| Strength | Low | Higher |
| Colour | White | Grey or yellowish |
| Lumps of lime | Soft, easily break | Hard |
| Volume increase | 2 to 2.5 times | Less |
| Uses | Whitewash, plaster | Masonry mortar in damp places, foundations |
✓ Answer checked by Claude Opus 5.5 (high effort)
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