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The Venta 25 slate is produced in the Castañeiro region of Northern Spain. The 25 is available in the following sizes: 50×37, 50×25, 45×33, 45×22, 40×37 and 40×25.
This slate is available in Premium and Standard thin grades, with the 50×25 premium pallets containing around 910 individual slates.
Data Sheet
| Water absorption | W1 |
| Non carbonate carbon content | In accordance <1% |
| Mechanical resistance characteristics (MoR) | Transversal 43 (Mpa) Longitudinal 54 (Mpa) |
| Calcium carbonate content | Complies <1% |
| Dimensional tolerances | Complies |
| Thermal cycle | T1 |
| Exposure SO2 | S1 |
| External fire performance | Deemed to satisfy A1 |
| Reaction to fire | Deemed to satisfy A1 |
| Release of dangerous substances | None |
| Use as roofing or external cladding | Yes |
