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Lithomex Stone Restoration and Repair Mortar
Specially formulated mortar based on Natural Hydraulic Lime and aggregates for the repair or simulation of masonry, brick or stone.
Lithomex is a neutral white or precoloured mortar supplied in 25 KG bags to which water is added.
Mixing and Use
Lithomex can be mixed manually or mechanically by whisk, adding up to 180ml water per kg of Lithomex. The application surface must be clean, free from dust and oils. On porous surfaces, ensure that suction is controlled by pre-wetting and apply lithomex before this is fully dry. Never apply to surfaces that are over saturated or have standing water. It can also be applied on metal laths. For application on dense impervious materials please consult The Lime Centre (tel: 01962 713636). The minimum thickness is 5mm (can be dressed or cut back to a feathered edge). The maximum thickness in one pass is 40mm. In cases where a thickness of more than 40mm is required, apply in layers of a maximum of 40mm, each one approximately 24 hours apart. Always dampen application areas. The mortar should be well pressed back in place. If required re-compact by pressing after a couple of hours to avoid possible shrinkage marks due to suction from the background. In some instances support of the fresh mortar is required by using wires, anchorages, stainless steel fixings or formers, etc. Simulation of stone / brick features, rough finishes, false joints etc. can be made approximately 5 hours from application (in damp cold weather up to 24hours).
Shaping and Forming of details can be carried out for up to one week after placing by scraping to profile or level with metal tools, such as the edge of a trowel or steel float however most shaping and finishing work can be done within 24 hours. Sculpting, using appropriate tools, requires waiting up to a week or more depending on weather conditions. Its unique qualities allow it to be tooled, shaped and sculpted even after the final set has taken place. This affords sufficient time to achieve the very highest standard of work with the best quality reproduction.
Where ashlar masonry or very finely jointed masonry has had considerable damage to the arises, flush finish in Lithomex with a false struck joint is the ideal solution.
If building details are damaged and require repair prior to the façade being lime washed or painted, plain Lithomex should be used as it will readily accept lime washes and paints.
On rendered areas Lithomex can be used to form decorative stone or brick features such as mouldings and cornices.
Technical Data
| Bulk Density kg/m3 | 1325 – 1360 |
| Granulometry | from 0.8 to 0.08mm |
| Consumption | 1.6kg to 1.7kg per m3 per mm of thickness |
| Setting Time | (in water with no surcharge) start 1h 30min / end 2hr 30min. Test on paste (water addition 18.7%) |
| Tests on hardened mortars (water addition 18.7%) | ||
|---|---|---|
| Capillarity | Tested at 28 days LOW | 2.06 gr.cm2 .root2 min |
| Water Permeability | Tested at 28 days LOW | 0.25 ml/m/day |
| Vapour Permeability | Tested at 28 days V. HIGH | 0.75gr/m2/hour/mmHg |
| Tensile Strength N/mm2 | Compressive Strength N/mm2 | Elastic Modulus Mpa | Shrinkage mm/m | |
| 7 days | 2.20 | 6.20 | - | 0.81 |
| 28 days | 2.38 | 7.25 | 7690 | 0.85 |