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The Calidad 90 slates are sourced from the world-renowned quarries in La Bana, Northern Spain. This slate gives great looks combined with superb weather resistance to let you create fantastic roofing results. With very little visible pyrite, the blue-grey finish looks as good from a distance as it does up close. With a great uniform look, this easily graded slate gives you a fantastic end result.
Data Sheet
| Water absorption | W1 |
| Non carbonate carbon content | In accordance <1% |
| Mechanical resistance characteristics (MoR) | Transversal 41N/mm2 Longitudinal 44N/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 |
