6 COLLETTI LANE

Old World Cobble®
6 COLLETTI LANE
SWANSEA, MA. 02777
PHONE (877) 999-8700
FAX ( 866) 777-4700

Measurement of Physical Properties
The various physical properties of dimension stones are tested by means of the procedures documented by ASTM. ASTM also publishes standards for the major stone types, listing the minimum/maximum values to be expected from a particular stone type in a particular test. It should be noted that there are many stones that do not meet these values, yet have demonstrated satisfactory performance in a variety of applications. This table should then be considered to be more of a general guide than an absolute pass/fail gauge.
Copies of the ASTM Standards and test procedures are available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, Tel: (610) 832 9500, or visit www.astm.org.

Click here for a .pdf file of the ASTM Specification...


Sure, you can find a cheaper paving material than granite cobblestones. But consider this – nothing beats the life span of granite cobblestones for paving. While concrete pavers have an average life span of 10 (???) years, granite cobblestones will last a lifetime. So over the course of your life, would you rather redo your driveway, walkway or patio many times or would you rather do it once? Colorful, aesthetic vertically as well as horizontally cobblestones are strong and when installed correctly granite cobbles are almost indestructible, raising the value of any property they're used on. Cobbles are beautiful and permanent. Impervious to rot or fading as other building materials are.

(continued from the left) The dimensional stability of granite is very good, so good in fact, that granite is the material of choice for high precision applications such as surface plates, machine mounts and press rolls, where tolerances can be measured in micro-inches (millionths of an inch).
Granite, like any solid, will expand and contract with changes in temperature. This change is relatively small. The coefficient of linear thermal expansion of granite is typically in the neighborhood of 4.4 x 10-6 inches per inch per degree Fahrenheit.
Granite will typically return to its original dimension when the original temperature is reestablished. Permanent strain, or failure to return to its original dimension will not normally occur unless the material has been heated to excessive temperatures (above 480°F [250°C]).
Granite has a natural resistance to caustic chemicals. This level of chemical resistance contributes to the ability of granite to resist attack from airborne pollutants associated with acid rain and/or snow-melting chemicals. Certainly there are chemicals that will attack granite, but exposure to them in a typical building environment would be extremely rare.
Flexural strength, or the ability to resist bending force, is a factor that determines the allowable span of a dimension stone panel in a given thickness subjected to given loads. Flexural strength varies amongst different types of granite, and typically is between 1,000 and 2,000 lbs/in². This allows the use of "thin" (30 mm) panels for many applications, minimizing both curtainwall cost and dead load for the building frame. Thicker granite panels (15/8" [40 mm], 2" [50 mm] or greater) are available where spans or loads necessitate their use.
For applications that are below grade or in contact with soil, water absorption is an important property. Absorption rates of granites range from 0.10% and 0.40% by weight. Furthermore, most granite materials will effectively allow water to evacuate during freezing cycles to prevent surface damage from the freezing water. Repetitive freeze/thaw cycles, particularly saturated cycles, will result in a reduction of strength in the granite panel. This loss can be significant, perhaps 20%. Laboratory experiments have shown that the strength loss occurs most aggressively in the first 100 cycles, after which the strength loss is much slower paced.