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RS ASTM C207-24
Standard Specification for Hydrated Lime for Masonry Purposes

Abstract

1.1 This specification covers four types of hydrated lime.
Types N and S are suitable for use in mortar, in scratch and
brown coats of cement plaster, for stucco, and for addition to
portland-cement concrete. Types NA and SA are air-entrained
hydrated limes that are suitable for use in any of the above uses
where the inherent properties of lime and air-entrainment are
desired. The four types of lime sold under this specification
shall be designated as follows:
1.1.1 Type N—Normal hydrated lime for masonry purposes.
1.1.2 Type S—Special hydrated lime for masonry purposes.
1.1.3 Type NA—Normal air-entraining hydrated lime for
masonry purposes.
1.1.4 Type SA—Special air-entraining hydrated lime for
masonry purposes.
NOTE 1—Type S, special hydrated lime, and Type SA, special air-
entraining hydrated lime, are differentiated from Type N, normal hydrated
lime, and Type NA, normal air-entraining hydrated lime, principally by
their ability to develop high, early plasticity and higher water retentivity,
and by a limitation on their unhydrated oxide content.
NOTE 2—For normal (Type N) and special (Type S) finishing hydrated
lime, refer to Specification C206.
NOTE 3—Some building codes prohibit the use of air-entraining
materials in mortar, because of the accompanying reduction in bond and
compressive strength. Where increased freeze-thaw resistance is
important, air-entraining may be beneficial. Air-entraining lime should not
be used as a finishing lime.
NOTE 4—For lime putty, refer to Specification C1489.

General Information

Code	Classification	Theme	Pages	Publisher	Availability
RS ASTM C207-24	ADOPTED ASTM STANDARDS	Civil engineering	3	2024 Version Apr 2025	Available