Pure and Natural Hydraulic Lime (NHL 2) Product Data
St Astier Natural Hydraulic Limes (NHL)
| Conforms to European Norm EN 459 and BS 459 Strength factor: 2 (Feebly hydraulic) Residue @ 0.09 mm: 5% Density (volumetric weight) : typical 500 gr. / litre Available (free) lime Ca(OH)2 after slaking: 50-55% Packing: 25kg. Bags |
Contains no additives Whiteness index: 76 Surface cover (cm2 per gram): 11000 Expansion : < 1mm Residue of quick lime after slaking: <1% Shelf life: 8-12 months kept sealed and dry |
| MORTARS | Compressive strength – N/mm2 | Elasticity Moduli (Mpa) | |||||
|---|---|---|---|---|---|---|---|
| MIX RATIO | EN459* | 1 : 2 | 1:2.5 | 1 : 3 | 1 : 2 | 1 : 2.5 | 1 : 3 |
| 7 DAYS | 0.62 | 0.53 | 0.47 | ||||
| 28 DAYS | 2.00* | 1.48 | 1.36 | 1.25 | 9025 | 9800 | 9000 |
| 6 MONTHS | 3.84 | 3.00 | 2.88 | 12600 | 12030 | 11800 | |
| 12 MONTHS | 4.00 | 2.90 | 2.90 | 12515 | 12030 | 11900 | |
| 24 MONTHS | 4.25 | 3.00 | 2.75 | 13375 | 12000 | 11750 | |
| Consumption for 1m3 of mortar (kg. +/- 10%) |
280 | 224 | 168 | ||||
| * EN/BS 459 ( mortar ratio 1:1 by volume with ISO 679 Sand) | |||||||
Mixing: can be mixed in cement mixers.
Application by spray gun: possible. Please consult us.
Working temperatures: not below 8oC or above 30oC. Make sure that high suction materials are thoroughly dampened before application. Avoid rapid drying due to high temperatures or strong winds by curing with a light water mist several times a day if necessary. Protect from frost, rain, direct sun and strong wind
See “Protecting Lime Mortar”.
SUITABLE FOR LATH WORK/INJECTION/GROUTING: see relevant sheets.
Reworking: possible within 24 hours.
Mortar composition
MASONRY/POINTING: 1 VOLUME OF NHL 2 : 2 VOLUMES OF SAND
Choose well graded sands (3mm: 75microns).
See also Applications & Good Working Practices – Sands for Lime Mortars
RENDERING:
On earth or friable supports, after preparation and cleaning, dampen with a 1:20 solution of NHL2/water applied in 2 coats.
| A. Scratch coat (3 – 4 mm) | 3 VOLUMES OF NHL 2 | 5 VOLUMES OF SAND |
This coat is applied by casting on to a still damp but not over saturated support and is left as cast to provide good keying.
| B. Undercoat (15-20 mm) | 1 VOLUME OF NHL 2 | 2 VOLUMES OF SAND |
Can be applied in 2 passes of min. 1cm. Second pass only after first is reasonably dry.
| C. Finishing ( 5mm) | 1 VOLUME OF NHL 2 | 2.5 VOLUMES OF SAND |
The dosage / thickness may vary in accordance with the desired finish and the sand used. In smooth floated finishes if very fine sands containing clay are used the binder (NHL) quantity will be reduced.
For further Guidance, contact your St Astier Distributor.
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