Test Certificates by
Istituto Giordano S.p.A.
(laboratory recognized by Ministry of Public Works, Law
05/11/1971, N.1086 con D.M. N.22913 del 27/11/1982) 
THE FOLLOWING TESTS WERE DONE
ON SPECIMENS OF ROCK NAMED PIANELLO STONE. PIANELLO STONE IS EXTRACTED
FROM THE "GORIETTI S.r.l. La Pietra di Pianello®" QUARRY, SITED IN
LOC. S. SAVINO (PERUGIA), AND IS PROCESSED IN THE ESTABLISHMENT OF
PIANELLO (PERUGIA). PIANELLO STONE IS USED FOR FLOORING, WALL CLADDING,
QUARRY FILLING AND INDOOR AND OUTDOOR FURNISHING. 
Test Certificate N.79248/64225/94
Compressive Strength.

Test Certificate N.79249/64226/94
Determination of Specific Weight of dry specimens. 
After article n. 22 of
circular n.532 of 17/02/54 of Ministry of Public Works. 
By R.d. n.2232 of 16/11/39. 
Test Result:
Average Compressive Strength : 1543,17 Kg./cm2 
Test Result:
The Specific Weight of dry specimens is given by the weight of a
welldried piece of stone, divided by the volume of that piece.
Specific Weight = 2,705 g/cm3 


Test Certificate N.79251/64228/94
Freezing Treatment. 
Test Certificate N.79250/64227/94
Tribometer Frictional Wear. Determination of the Coefficient of
Abrasion 
After Article n. 23 of
circular n.532 of 17/02/54 of Ministry of Public Works. 
After Article n. 24 of
circular n.532 of 17/02/54 of Ministry of Public Works. 
Test Result: After
undergoing treatment, the specimens tested did not show any cracks
nor traces of damage nor weight loss. Their average compressive
strength was similar to that of the corresponding check specimens
that had not undergone any treatment. 
Test Result:
Coefficient of Abrasion "K"=0,61 
Test Certificate N.107436/86726/97
Water Absorption. Determination of the Coefficient of Imbibition

Test Certificate N.107437/86727/97
Determination of Shear Strength (breaking strength) for paving
material.

After Art. 7 of R.d. n.2232
of 16/11/39 
After R.d. n.2234 of
16/11/39. 
Test Result:
Average Coefficient of Imbibition = 0,00989 
Test Result:
Average Modulus of Rupture = 0,475 Kgm. 


Test Certificate N.107435/86725/97
Determination of Tensile Strength. (bending strength)

By R.d. n.2234 del 16/11/39. 
Test Result:
4 specimens were tested.
Each specimen was laid on two parallel supporting blades with
rounded edges, divided by a distance of cm.10. Then a third
parallel blade gradually transferred the load on the opposite side
along the median line.
Modulus of Rupture = 258,67 Kg./cm. 
The abovementioned test
results regard exclusively Pianello Stone mined and processed by
the GORIETTI S.r.l. La Pietra di Pianello® Company. This
publication may not be reproduced or transmitted, by any form or
by any means, without the prior permission of the owner. Any
person who infringes the present rule will be charged with
counterfeit and will be punished by Law. 

