Pure and Natural Hydraulic Lime (NHL 3.5) Product Data

St Astier Natural Hydraulic Limes (NHL)

Conforms to European Norms EN 459 and BS 459
Strength factor: 3.5 (Moderately hydraulic)
Residue @ 0.09 mm: 6.5%
Density (volumetric weight) : typical 650gr / litre
Available (free) lime after slaking Ca(OH)2: 25% +
Packing: 25kg. Bags
Contains no additives.
Whiteness index: 72
Surface cover (cm2pergram): 9000
Expansion : < 1mm
Residue of quick lime after slaking: < 1%
Shelf life: 8-12 months kept sealed and dry
MORTARS Compressive strengthN/mm2 Elasticity Moduli (Mpa)
MIX RATIO EN459* 1 : 2 1 : 2.5 1 : 3 1 : 2 1:2.5 1 :3
7 DAYS   0.75 0.57 0.53  
28 DAYS 3.5* 1.88 1.47 1.34 9010 9000 8070
6 MONTHS   7.1 5.34 3.94 15260 13501 13150
12 MONTHS   7.5 5.90 3.90 15280 13620 13150
24 MONTHS   8.63 6.00 3.97 17480 13785 13670
Consumption for 1m3
of mortar Kg. +/- 10%
  305 244 216      
EN 459/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 5oC 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. See "Protecting Lime Mortar".

SUITABLE FOR LATH WORK / LIME CONCRETE/INJECTION/GROUTING See relevant sheets

Reworking: possible within 12 hours

Mortar composition: MASONRY/POINTING/ CAPPING/ BEDDING/ ASHLAR

Binder: sand ratio: from 1:1.5 to 1:3 depending on the support/background conditions, the size of the joint and the fineness of the sand. Always use well graded sands ( 3 - 4mm down to 75 microns).
See also "Applications & Good Working Practices Sands for Lime Mortars" .

RENDERING
A. Scratch coat (3-5mm) 1 VOLUME OF NHL 3.5 : 1.5 VOLUMES OF SAND - Cast on
B. Undercoat (15-20mm) 1 VOLUME OF NHL 3.5 : 2 VOLUMES OF SAND*
C. Finishing (5-10mm) 1 VOLUME OF NHL 3.5 : 2.5 VOLUMES OF SAND
With very fine sands possibly containing clays the binder content may have to be reduced.
*At this dosage the consumption is approx. 0.35kg. of NHL 3.5 per m2 for each mm thickness.
Please also refer to "Applications & Good Working Practices - NHL Renders."

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For further Guidance, contact your St Astier Distributor.
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