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Sourced from Quiroga, Northern Spain, the Calidad 80 slate is a great choice for those looking for functionality and a great appearance. The Calidad 80 slates have almost no visible pyrite to give a great finish and ensure stability throughout the slate. With its attractive blue-grey colour and ease of grading, this slate gives a pleasing look and easy installation.
Data Sheet
| Water absorption | W1 |
| Non carbonate carbon content | In accordance <1% |
| Mechanical resistance characteristics (MoR) | Transversal 48N/mm2 Longitudinal 54N/mm2 |
| 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 |
