RJ5.01A Hydraulic Limes

1. Product Names:

ST. ASTIER Natural Hydraulic Lime NHL 2

Natural Hydraulic Lime NHL 3.5

Natural Hydraulic lime NHL 5

2. Description.

White or off-white powders used as binders in mortars, plasters, renders and grouts.

3. Composition.

The result of burning siliceous limestones at >1000°C, and then hydrating with water to form a hydrate. Composed of lime, silica, alumina and trace elements, 


Refer to St Astier Website (www.stastier.co.uk/nhl/health-safety) for full Health & Safety data.

CAS No: 85117-09-5. Alkali (pH 13).

EINECS No: 285-561-1.


H318 Causes Serious Eye Damage.


H315 Causes skin irritation.

H335 May cause respiratory irritation.

5 Hazards Identification.

NHL products do not contain any dangerous substances or toxic products. Not classified as dangerous to supply.

6. First Aid Measures.

Inhalation: If inhalation has occurred, go into fresh air. Particles, if inhaled can irritate the upper respiratory tract, and dry mucous membranes. If irritation persists seek medical advice.

Eye Contact: Avoid contact with eyes. When mixed with water the paste is highly alkaline. Remove contact lenses. Irrigate copiously with clean fresh water. Seek medical advice.

Skin Contact: Avoid prolonged contact with skin. When mixed with water, the highly alkaline paste can dry the skin, and cause allergic skin reactions in hypersensitive individuals. Always rinse skin after contact, and use protective creams against allergic symptoms.

7. Fire Fighting Measures:

Non Flammable. MO classification.

No dangerous decomposition products.

8. Accidental Release Measures:


Recover powder and dispose (landfill) in accordance with the waste regulations as non hazardous waste.

DO NOT allow to enter drains or water courses

9. Handling and Storage.


Handle in ventilated areas and prevent dust diffusion,

Do not inhale or ingest. Protect eyes and skin.

Smoking, eating and drinking should be prohibited in areas of storage and use.


Observe product data precautions. Limited Shelf Life.

Store in sealed bags or tubs in dry storage. Protect from air and rain.

10. Exposure Controls/ Personal Protection.

Provide adequate ventilation.

Respiratory protection:

Wear mask during mixing.

Hand Protection:

Barrier creams may help but are no substitute for full physical protection. Seek advice from glove manufacturers on appropriate types.

Eye Protection:

Wear eye protection at all times.

Skin Protection:

Wear adequate protective clothing. Cotton or cotton/synthetic overalls are normally suitable.

11. Physical and Chemical Properties.

Physical State:

White/ off-white/ creamy-white Powder.

Solubility in water:

Dissolution is accompanied by the immediate precipitation of the formed hydrates.

pH:                                      12-13 in water.

Specific Gravity:                   0.6 to 0.95 

12. Environmental Information.

Lime plants are equipped with dust elimination filters.

After hardening, the lime and its products are definitively combined and insoluble. No further precautions are necessary.

Do not allow lime or mortar to enter drains or water courses.

13. Disposal

Dispose as Non Hazardous waste in accordance with the Environment Protection Act 1990.

14. Transport.

Not dangerous for transport.

Always transport in sealed containers that are upright and secure.