Having our own quarries, the majority of which are in Southeast Finland, guarantees reliable supplies.

Kuru Grey

Kuru Grey

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 value0,14
Standard deviation (%)0
 
Apparent Density (kg/m3) mean value2630
density from ... To ...(kg/m3)2630 to 2630
Standard deviation(kg/m3)0
 
Open porosity (%) mean value0,44
standard deviation (%)0,01
 
Flexural strength (MPa) mean value15,4
Standard deviation(MPa)0,5
Min exp value(MPa)14,4
 
Flexural strength after frost (MPa) mean value15,3
Change in mean flexural strength after 48 cycles (%)0,6
Standard deviation(MPa)0,3
Min exp value(MPa)14,8
 
Compression strength (MPa) mean value216
Standard deviation(MPa)20,5
Min exp value(MPa)170
 
Compression strength after frost (MPa) mean value227
Standard deviation(MPa)31,6
Min exp value(MPa)164
 
Water absorption by Capillarity C (g/m2s0,5) mean value0,666
Standard deviation(g/m2s0,5)0,081
 
Skid resistance - dry polished mean value46,1
Skid resistance - wet polished mean value11,2
Skid resistance - dry honed mean value52,1
Skid resistance - wet honed mean value39,1
 
Abrasion resistance (mm) mean value17
 
Resistance at the anchoring system
Mean breaking Load(N)2900
Min exp value (N)2363
Standard deviation (N)300
d1(mm)10,3
bA(mm)43,3
Resistance to Thermal shockNPD
visual changes
max Mass change (%)
max res. Freq. change (%)
 
Water absorption by Capillarity C (g/m2s0,5)no directions
parallel mean value
Standard deviation
 
Water vapour resistance factor μ dry10000
Water vapour resistance factor μ wet10000