Finnish Kuru Grey is a dark grey, fine-grained granite, which has excellent technical properties. It creates an atmosphere of harmony in both modern and classic surroundings. Kuru Grey is also very popular stone for monuments.
Technical properties
| Water absorption (%) mean value | 0,16 |
| Standard deviation (%) | 0,02 |
| Apparent Density (kg/m3) mean value | 2670 |
| density from … To …(kg/m3) | 2690 to 2710 |
| Standard deviation(kg/m3) | 8 |
| Open porosity (%) mean value | 0,38 |
| standard deviation (%) | 0,04 |
| Flexural strength (MPa) mean value | 10,3 |
| Standard deviation(MPa) | 1,7 |
| Min exp value(MPa) | 8,9 |
| Flexural strength after frost (MPa) mean value | 9,6 |
| Change in mean flexural strength after 48 cycles (%) | 13,0 |
| Standard deviation(MPa) | 1,3 |
| Min exp value(MPa) | 8,1 |
| Compression strength (MPa) mean value | 187 |
| Standard deviation(MPa) | 23,2 |
| Min exp value(MPa) | 116 |
| Compression strength after frost (MPa) mean value | 175 |
| Standard deviation(MPa) | 21,6 |
| Min exp value(MPa) | 124 |
| Water absorption by Capillarity C (g/m2s0,5) mean value | 0,273 |
| Standard deviation(g/m2s0,5) | 0,032 |
| Skid resistance – dry polished mean value | 48,7 |
| Skid resistance – wet polished mean value | 15,3 |
| Skid resistance – dry honed mean value | 51,3 |
| Skid resistance – wet honed mean value | 32,5 |
| Abrasion resistance (mm) mean value | 17 |
| Resistance at the anchoring system | |
| Mean breaking Load(N) | 2400 |
| Min exp value (N) | 1727 |
| Standard deviation (N) | 400 |
| d1(mm) | 10,1 |
| bA(mm) | 47,4 |
| Resistance to Thermal shock | |
| visual changes | no |
| max Mass change (%) | 0,03 |
| max res. Freq. change (%) | 8,5 |
| Water absorption by Capillarity C (g/m2s0,5) | no directions |
| parallel mean value | |
| Standard deviation | |
| Water vapour resistance factor μ dry | 10000 |
| Water vapour resistance factor μ wet | 10000 |
