Otterbein Natural Hydraulic Lime (NHL)

Natural Hydraulic Lime binders for mortars, renders and plasters. Available in three strengths: NHL2 and NHL3.5.

Key Benefits

  • Excellent vapour permeability, amongst the highest free lime (Ca(OH2) content of all commercially available NHL’s
  • Low modulus of elasticity makes Otterbein suitable for large aspects and reduces the risk of cracking
  • Produces less CO2 during production and absorbs CO2 during set, making it an environmentally friendly choice
  • Suitable for use on most aspects of building conservation and relevant new build applications.



5% discount on orders over £500 (Excluding Vat & Delivery). For larger projects visit our pricing page.

Product Variations

Product OptionPrice (Ex VAT)
nhl2: £15.18 £18.22 inc VAT
nhl3-5: £15.52 £18.62 inc VAT
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NHL’s have a hydraulic set and can be used in damp conditions and will produce an earlier resistance to frost than Non-Hydraulic (e.g. Lime Putty based mortars).

Otterbein NHL’s are a light tan, brown binder used for making Lime Mortars and Renders. Otterbein NHL’s all have a higher free lime content than most other NHL’s which can offer distinct advantages from the point of workability.

Otterbein like most NHL’s will set hard and can be used in more aggressive, damp environments producing an earlier (chemical) set with a greater resistance to frost than pure Non-hydraulic Limes. However, given their higher freelime content it might be prudent to avoid their use in certain applications.

Available in two strengths: NHL2 and NHL3.5 Natural Hydraulic Limes (NHL) are made from limestone containing impurities which enable a hydraulic set. They are supplied as dry powders, and begin to set through a chemical reaction known as hydration, when water is added.


Otterbein Natural Hydraulic Lime can be mixed with a coarse or fine sand to make a lime mortar or render. Browse our range of coarse sands or fine sands for lime mortars, renders and plasters.

NHLs are suitable for use in a variety of situations where vapour permeability is important. Generally, the more exposed to the elements the application is, the harder the material. A hard mortar should never be used over a softer one, so NHL2 or a lime putty mortar should be used for softer backgrounds.

Each project is unique, always seek professional advice before undertaking a project.

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