Masons Mortar Ltd
77 Salamander Street
Edinburgh EH6 7JZ

Tel: 0131 555 0503
Fax: 0131 553 7158

Masons Mortar Ltd
Unit I, Woodville Court
Woodville Street
Glasgow G51 2RL

Tel: 0141 445 4812
Fax: 0141 445 8898

Masons Mortar Ltd
Block 2
Woodend Industrial Estate
Cowdenbeath, Fife

Tel: 01383 514 460

Masons Mortar Ltd
Unit 11
Brough Park Trading Estate
Fossway, Newcastle upon Tyne

Tel: 0191 908 9234

Prompt Natural Cement

Prompt has been in use continuously since the 1850's. It is a very simple material with some complex characteristics, manufactured from Argillaceous Limestone (Limestone containing some clays). It is simply mined, fired (at much lower temperatures than ordinary cement) and milled. Nothing is added to it, nothing is taken away.

Having been in use for over a hundred and fifty years it has been tested and proven well beyond the abilities of Ordinary Portland Cement.

This natural cement from France can be used in conjunction with Tempo (citric acid) in order to control setting times. It has a high initial strength and quick setting time. Once the material has set, it is waterproof.
For use with: Engineering, tidal, river and canal work. Gauging for hydraulic lime mortars
Please click link for Applications and mixing information.
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Prompt is a very fast setting material, however it's set can be adjusted using TEMPO. TEMPO is specially designed to adjust the setting time of Prompt Natural Cement to the working pace of the professional. The set of Prompt is also affected by the ambient temperature; the warmer it is the faster the mortar will set. TEMPO is easy to use, comes in an 80g bottle and a full bottle is a suitable quantity for a full bag of Prompt.
Please click link for TEMPO
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Setting time = Speed
Temperature of the mortar                10°C           20°C          30°C
Setting time without TEMPO               4 Minutes    2 Minutes   1 Minutes
Setting time with the TEMPO Dose      30 Minutes  15 Minutes  10 Minutes