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.

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For further Guidance, contact your St Astier Distributor.
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