What is the compressive strength of Giallo Siena marble?
89.4 to 175 MPa, published to EN 1926-07, and the two published clusters differ by almost a factor of two.
Answer
Why do sources give different figures for Giallo Siena marble?
The published figures
Because they tested different specimens, and because this is a variant material. Water absorption is published at 0.12 per cent and at 0.04 per cent; compressive strength at 89.4 MPa and at 163 to 175 MPa. Both are stated on this site, with the conflict named, rather than one being quietly chosen.
The figures
| Property | Range published across sources | Source |
|---|---|---|
| Water absorption | 0.04% to 0.3% | EN 13755 ranges [S1] and [S6] |
| Compressive strength | 80–175 MPa | EN 1926 ranges [S1] and [S6] |
| Flexural strength | 8–25 MPa | EN 12372 ranges |
| Apparent density | 2,650–2,750 kg/m³ | EN 1936 ranges |
Why this stone behaves this way
Giallo Siena is sold under several names and several variants, and two laboratories testing two specimen sets will not land on the same number. Stating the spread is what makes the material describable; a single figure chosen from two sources would be a figure nobody measured.
What these figures are, and what they are not This page gives ranges, not a value. The figure that governs a job is the one on the certificate issued for the block being bought.
Where these figures come from
- S1 granitalsiena.com — Giallo Siena marble technical sheet (EN standard test values; Politecnico di Torino marble laboratory)
- S6 StoneContact — Giallo Siena Unito and Broccatello di Siena entries, carrying Università di Pisa - Politecnico di Torino test values for the material
- S7 forustone.com — Giallo Siena product page (current slab and tile references, care guidance)
Where to go next
On the same subject
More questions about Giallo Siena marble
What is the water absorption of Giallo Siena marble?
0.04 per cent to 0.12 per cent, published to EN 13755-08.
This answer sits on the The published figures page, with the rest of the questions about it.
Technical recordAsk for a price
A thickness, a format, a finish, a quantity and a destination will get you a quotation for Giallo Siena marble.
Why do sources give different figures for Giallo Siena marble?