Singleton Birch NHL 5 Hydraulic Lime

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Quick Overview

Natural Hydraulic Lime NHL 5 is typically used for external works in exposed areas such as chimneys, copings, parapets and masonry exposed to severe weather.

NHL5 lime mortar provides a faster and harder finish perfect for harder stones etc.

NHL 5 Hydraulic Lime 1

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  • NHL 5 Hydraulic Lime 1

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  • 25kg bag.

Fast setting powdered lime for use where a higher level of durability is required e.g. wall copings, parapets, chimneys and masonry exposed to severe weather, or when pointing harder stone like granite etc.


Test Category

Lime is a traditional building material that is strong, flexible and permeable. Buildings built using lime mortar can move and absorb moisture. In comparison cement mortar is rigid and inflexible.  When Using lime mortar expansion joints can be avoided. Likewise the imperviousness of cement mortar prevents it from absorbing water from the structure whereas lime mortar acts as a kind of 'wick', absorbing the moisture and allowing it to evaporate. By absorbing moisture, lime mortar is keeping the masonry dryer and lessening the risk of spalling.  Lime is most often used in traditional buildings but modern lime renders and putty's are now emerging as viable performance options over cement based products. This is especially true of construction methods that require the building to breathe.

By being produced at lower temperatures than cement, lime mortar requires less energy, resulting in 20% less CO2 output.  Lime putty absorbs CO2 in the curing process. Non-hydraulic lime absorbs nearly its own weight in CO2, hydraulic lime, around 75% and lower. Lime mortar can be re-cycled, unlike cement.  Bricks using lime mortar can be recycled unlike the cement bonded equivalent which can only be used for hardcore.

There are two basic types of lime: hydrated lime where an exact amount of water is added, creating a dry powder sold in bags and generally known as hydrated lime or lime hydrate. If more water is added (slaking) the end product is a colloidal gel, commonly sold in plastics tubs and known as lime putty.

Limestone's which contain clay produce building limes known as hydraulic because they can set under water. The clay impurities contain silica and alumina which forms a more chemically complex and different product. The more clay impurity the faster the set and the harder the mortar.

Modern lime products include spray applied renders and insulating renders for example the Ecomerchant Protect System and a wide range of products to meet most construction applications both new and retrofit. Ecomerchant can offer guidance and suitability for all applications.  Needless to say all necessary ancillaries are available for you to ensure a complete service.

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