We Work for
Terra Cotta Specification
Physical properties of terra cotta and faience, tested in accordance with the British Standards (BS) and the American Society for Testing and Materials (ASTM), by Ceram Research, British Ceramic Research Ltd.
All of our processes are controlled by a Quality Management System complying to ISO9001:2008, which we believe is the absolute minimum our customers should come to expect.
All of our products exceed the test requirements shown in the standards below:
|Compressive Strength||ASTM C67||8000 psi +/- 500|
|Absorption (24hr soak)||ASTM C67||7.9% max|
|Absorption ( 5hr boil)||ASTM C67||11.9% max|
|Saturation coefficient||ASTM C67||0.69 max|
|Glaze Absorption||-||0.15% max|
|Freeze/Thaw Resistance||ASTM C67 (300 cycles)||300 cycles|
|Craze Resistance||ASTM C126||Pass|
|Craze Resistance||ASTM C424||Pass|
|Imperviousness||AIA File No.9||Pass|
|Chemical Resistance||AIA File No.9||Pass|
|Glaze Crazing||AIA File No.9||Pass|
|Glaze Adhesion||AIA File No.9||Pass|
Dimensional tolerance for architectural terra cotta is +/- 2%
View our UK Specifications here
Vitrified ceramic materials are unaffected by ageing, weathering, ultraviolet radiation or atmospheric pollution.
For some restoration projects or specific design requirements, it may be more important to achieve a good aesthetic match than to achieve specific physical properties and tolerances. Each project should be individually considered.
Fixing and Cleaning
The importance of employing companies that are competent or who have years of experience in such matters can not be stressed highly enough.
All too often we see some of the finest buildings having been incorrectly cleaned, causing irreparable damage to materials. The fixing of terra cotta and faience should not be underestimated. It is only with experience that their natural characteristics are appreciated. Shaws of Darwen will gladly advise on both these important matters and recommend specialist companies able to carry out such work.
For general site handling, fixing, safety and physical property specifications, please contact our terra cotta sales office.