Testing For Sulphate Contamination

Testing For Sulphate Contamination Manchester Building and Testing Laboratories can carry out analysis in our laboratories to determine the sulphur trioxide as a percentage of the cement content.

BS 4551 states :- Analysis of cement-based mortar showing a sulphur trioxide to cement content higher than 4 % indicates the possibility of the mortar having been exposed to attack by sulphates.

(NOTE Portland cement (CEM I 42.5 N) based mortars do not normally have a sulphur trioxide to cement content of more than 4 %. For allowable sulphur trioxide contents for other cement designations see BS 197-1.)