Does Giallo Siena marble need to be sealed?
Keeping the surface
Yes, routinely rather than as a rescue. Water absorption on this stone is published between 0.04 and 0.12 per cent, which is low, so sealing is a maintenance step on a six to twelve month cycle and not a treatment for a damaged floor.
The figures
| Property | Value | Source |
|---|---|---|
| Water absorption | 0.04% to 0.12% (published values across sources) | EN 13755-08 |
| Open porosity | 0.30% mean, 0.30 standard deviation | EN 1936-07, published technical sheet |
| Sealing cycle | 6 to 12 months, depending on finish and traffic | published maintenance practice |
Why this stone behaves this way
Giallo Siena marble is a calcitic breccia with a low but real porosity, and the sealer slows the water going in. It does not make the stone acid-proof and it does not make it scratch-proof, and a sealer only works on a surface that has been properly cleaned first.
What these figures are, and what they are not Sealing reduces absorption. It does not stop the stone reacting with acid, and it does not protect it from being scratched. Where a figure is ours and where it is published is stated on the technical record page.
Where these figures come from
- S1 granitalsiena.com — Giallo Siena marble technical sheet (EN standard test values; Politecnico di Torino marble laboratory)
- S8 lxcc.com — Giallo Siena product page (composition, acid sensitivity, sealing cycle, installation)
- S15 mggroupin.com — marble maintenance practice (sealing cycle, etching prevention)
Where to go next
This answer sits on the Keeping the surface page, with the rest of the questions about it.
Care and maintenanceAsk for a price
A thickness, a format, a finish, a quantity and a destination will get you a quotation for Giallo Siena marble.
Does Giallo Siena marble need to be sealed?