Non-hydraulic lime
England in 2008, defines non-hydraulic lime (or putty lime) as: ‘Lime which will not set by chemical reaction with water but requires exposure to carbon dioxide in the air in order to harden. Unlike hydraulic limes (see Hydraulic lime), it is derived from pure limestone. It is commercially available in powder (hydrated) or putty form.’
Short Guide, Lime Mortars in Traditional Buildings, published on 1 March 2013 by Historic Scotland, defines putty lime as a: ‘Hydrated lime binder that has been slaked with an excess of water forming a wet paste that can be left to mature over time.’
See also: Hydraulic lime.
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