The charts below show the information available on the test certificates from each cement producer in Great Britain. The 7 to 28 day strength growth is simply calculated from the 7 and 28 day data. The other data are quoted from the certificates.

Some certificates provide more information than others, for example the Lafarge Tarmac certificates provide chloride figures on a weekly basis while the others do not.

The data are provided purely for information and are quoted from test certificate data published online by the cement producers.