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Hourdex is a modified hydraulic lime binder, manufactured by Saint Astier in France. Hourdex is based on NHL 5 with the addition of a small proportion of a grey low sulfate cement and additives to improve workability. Hourdex is classed as a “multiuse binder” meaning that when specified correctly, Hourdex can be used for a wide number of applications, such as: Building, pointing, renders, skews, chimney haunching and floor tiling. As a modified hydraulic lime, Hourdex develops its compressive strength and resistance to freeze thaw more quickly than a pure NHL. Hourdex can be mixed with appropriate well graded sands to produce M2, M4 and M6 mortars. Please consult our technical department for further guidance.

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SKU: HOURDEX Category:


HOURDEX (25kg)  a multi use binder St Astier Hydraulic Limes (HL). For Hourdex building mortars, renders stipple and base coats, roofing, chimneys, floor tiling. Hourdex is based on St Astier natural hydraulic lime NHL  with a special low sulphate cement and additives for highly workable and breathable mortars

Hourdex mortar preparation: Up to 5 minutes in conventional drum mixers.

Sand: Clean, well graded 0-3mm (general). Lower or higher granulometries can be adopted.
Avoid monogranular sands. Sands for renders base coats should not be below 0-2mm.

Adequately dampen materials or background if too dry or with high suction. Do not work in temperatures below 5 oC or above 35 oC. The building materials or background should not be frosty or too hot or water saturated. Protect fresh mortars from frost, rain or strong direct sun. Storage: in dry store. Reseal open bags a.s.a.p

The above details are given for general information purposes and do not constitute a specification.


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