These tiles are obtained by melting and subsequently casting an effusive rock of volcanic origin, anthracite in color, with a silica (SiO2) content of less than 50%, and composed mainly of plagioclase, pyroxene, magnetite, and olivine.
The photographs are purely indicative: for actual colors and surfaces, please refer to our samples.
| BASIC PROPERTIES | ||
| Mohs hardness | EN 101 | min. grade 8 |
| Density | EN 993-1 | 2.90-3.00 kg/m3 |
| Water absorption | EN ISO 1054-3 | 0% |
| Compressive strength | EN 993-5 | min. 300-450 MPa |
| Bending resistance | EN 993-6 | min. 45 Mpa |
| Linear thermal expansion coefficient | EN ISO 10545-8 | max. 8.10-6K-1 (0 – 100 °C) max. 9.10-6K-1 (0 – 400 °C) |
| Solubility in sulfuric acid | EN 993-16 | max. 9% of mass |
| Sodium hydroxide insolubility | CSN 72 5122 | min. 98,6% of mass |
| Abrasion resistance | DN 52108 | max. loss of 5 cm³/50 cm² |
| Deep abrasion resistance | EN ISO 110545-6 | max. loss of 110 mm3 |
| Resistance to thermal shocks | DIN 52313 | min. 150 °C |
| Frost resistance | EN ISO 10545-12 | from -15 to +15 °C (min. 50 cycles) |
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