We Work for


Approved by



Drying blocks for Technical Specifications

Physical properties of terracotta 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:

Test Standard
Compressive Strength BS EN772-1: 2000
Absorption BS EN ISO 10545-3: 1997
Frost Resistance BS EN ISO 10545-12: 1997
Crazing Resistance BS EN ISO 10545-11: 1997
Chemical Resistance BS EN ISO 10545-13: 1997
Thermal Expansion BS EN ISO 10545-8: 1997
Mohs Hardness BBS 6431-13: 1986 & EN101: 1991
Net and Gross Density BS EN 772-13: 2000
Soluble Salts BS EN 772-5: 2001

Dimensional tolerance for architectural terracotta is +/- 2%

View our US Specifications.


Durability example

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 our country’s finest buildings having been incorrectly cleaned, causing irreparable damage to materials. The fixing of terracotta 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 terracotta sales office.