A key difference between UKCSA Full Members and other cast stone manufacturers is the high compressive strength of their products, which makes them significantly more robust and durable.
The minimum standard required of UKCSA Full Members represents over 40% increase in compressive strength above that indicated in the British Standard for Cast Stone, BS 1217, and at least 75% above the minimum requirement in the Standard for Manufactured Stone, BS EN 771-5.
UKCSA’s performance test stipulates that: the average crushing strength of 3 cubes tested to BS EN 12390: Part 3 shall not be less than 35 MPa at 28 days old. No individual cube is to have a strength less than 28 MPa.
The UKCSA strength requirement came as a result of a two year Partners in Technology research project into cast stone, undertaken by Dundee University and co-funded by the UK Cast Stone Association and the UK Government.