What are the differences between Type N, NA, S, & SA hydrated lime used for mortar and other building applications?
A short fact sheet on hydrated lime for masonry purposes is available under Technical Information. Hydrated limes used in building applications are divided into four types, as described in ASTM Standard Specification C 207 (Hydrated Lime for Masonry Purposes): • Type N normal hydrated lime • Type NA normal air-entraining hydrated lime • Type S special hydrated lime • Type SA special air-entraining hydrated lime Types S and SA are differentiated from Types N and NA principally by their ability to develop high early plasticity, higher water retentivity, and by their limitation on unhydrated oxide content. The maximum air content of cement-lime mortar made with Types NA and SA is 14%; with Types N or S lime, 7%.
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