Irish Blue Limestone was formed some 340 million years ago as a compact crinoidal limestone with a rich fossil content of mainly brachiopods (shellfish) and polyps. Finely dispersed carbon through the stone mass results in a typical blue-grey colour.

Technical Specifications of Irish Blue Limestone by Kilkenny Limestone

Standard

Mean value +/- standard deviation

Density

EN 1936

2680 +/- 8

kg/m³

Porosity

EN 1936

0,4 +/- 0,1

% vol

Waterabsorption under atmospheric pressure

EN 13755

0,11 +/- 0,02

% weight

Compressive strength

EN 1926

137 +/- 13

MPa

Flexural strength

EN 12372

15,2 +/- 2,3

MPa

Wear resistance

EN 14157

19,2 +/- 0,8

mm

Frost resistance

EN 12371

168 cycles

Chemical composition

Over 98% Calcite, 0.7% Dolomite, 0.7% Quarts, 0.2% organic Carbon, Less then 0.1% Iron Sulfite

Due to its extremely low Iron composite content, Irish blue limestone is suitable for use in pressurized urban or industrial environments without risk of compromising the stone through brown discolouration or staining.