ASTM C207-18
(Specification)Standard Specification for Hydrated Lime for Masonry Purposes
Standard Specification for Hydrated Lime for Masonry Purposes
ABSTRACT
This specification covers four types of hydrated lime. Type 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 under this specification shall be designated as Type N which is the normal hydrated lime for masonry purposes, type S which is the special hydrated lime for masonry purposes, type NA which is the normal air-entraining hydrated lime for masonry purposes and type SA which is the special air-entraining hydrated lime for masonry purposes. Hydrated lime for masonry purposes shall conform to the required chemical composition for calcium and magnesium oxides and carbon dioxide. The hydrated lime covered by Types N or S in this specification shall contain no additives for the purpose of entraining air.
SCOPE
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.
1.2 The values stated in SI units are to be regarded as standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
- Status
- Published
- Publication Date
- 30-Sep-2018
- Technical Committee
- C07 - Lime and Limestone
- Drafting Committee
- C07.02 - Specifications and Guidelines
Relations
- Effective Date
- 01-Dec-2019
- Effective Date
- 01-May-2019
- Refers
ASTM C110-16 - Standard Test Methods for Physical Testing of Quicklime, Hydrated Lime, and Limestone - Effective Date
- 01-Dec-2016
- Refers
ASTM C110-15 - Standard Test Methods for Physical Testing of Quicklime, Hydrated Lime, and Limestone - Effective Date
- 01-Jun-2015
- Effective Date
- 01-Jun-2015
- Effective Date
- 01-Dec-2014
- Refers
ASTM C110-14 - Standard Test Methods for Physical Testing of Quicklime, Hydrated Lime, and Limestone - Effective Date
- 01-Dec-2014
- Effective Date
- 01-Jun-2013
- Effective Date
- 01-Jun-2013
- Effective Date
- 15-Jul-2012
- Effective Date
- 01-Jul-2012
- Effective Date
- 01-May-2012
- Refers
ASTM C110-11 - Standard Test Methods for Physical Testing of Quicklime, Hydrated Lime, and Limestone - Effective Date
- 01-Jun-2011
- Effective Date
- 01-Jun-2011
- Refers
ASTM C110-10 - Standard Test Methods for Physical Testing of Quicklime, Hydrated Lime, and Limestone - Effective Date
- 01-Dec-2010
Overview
ASTM C207-18 - Standard Specification for Hydrated Lime for Masonry Purposes provides requirements for four types of hydrated lime used in masonry applications. Developed by ASTM International, this specification ensures that lime products meet essential chemical and physical standards for use in mortar, cement plaster, stucco, and as an additive to Portland-cement concrete. The document outlines both normal and air-entraining hydrated limes, considering the needs of both durability and workability in masonry construction.
Key Topics
Types of Hydrated Lime:
- Type N: Normal hydrated lime for masonry purposes.
- Type S: Special hydrated lime, distinguished by higher plasticity and water retention, with limitations on unhydrated oxide content.
- Type NA: Normal air-entraining hydrated lime.
- Type SA: Special air-entraining hydrated lime, also featuring increased plasticity and water retention.
Air-Entrainment:
- Types NA and SA include additives for air-entrainment, beneficial in improving freeze-thaw durability.
- Types N and S contain no air-entraining agents.
Chemical Composition:
- All types require a minimum of 95% calcium and magnesium oxides (nonvolatile basis).
- Carbon dioxide content and unhydrated oxides are controlled to prevent quality issues in construction.
Physical Requirements:
- Residue on sieve, popping and pitting, plasticity, and water retention are key properties.
- Type S and SA must achieve defined plasticity and water retention standards, improving workability.
Marking and Certification:
- Packages containing air-entraining types must clearly state type and manufacturer on all documentation.
Applications
ASTM C207-18 is essential for professionals working with masonry materials, including:
- Mortar production: Ensures consistent quality for laying bricks, blocks, and stone.
- Cement plaster and stucco: Enhances workability in both scratch and brown coats.
- Portland-cement concrete: Improves plasticity, cohesion, and water retention when hydrated lime is added.
- Freeze-thaw environments: Air-entraining limes (Types NA and SA) are recommended for areas where resistance to weather cycles is needed.
- General masonry repairs: Provides specification compliance for restoration, repair, and construction projects.
Note: Some building codes restrict the use of air-entraining limes in certain mortars due to potential reductions in bond and compressive strength.
Related Standards
For complete compliance and optimal use of hydrated lime in masonry, users should reference the following associated ASTM standards:
- ASTM C25: Test Methods for Chemical Analysis of Limestone, Quicklime, and Hydrated Lime.
- ASTM C110: Test Methods for Physical Testing of Quicklime, Hydrated Lime, and Limestone.
- ASTM C50/C50M: Practice for Sampling, Sample Preparation, Packaging, and Marking of Lime and Limestone Products.
- ASTM C206: Specification for Finishing Hydrated Lime (for finishing applications).
- ASTM C226: Specification for Air-Entraining Additions for Use in the Manufacture of Air-Entraining Hydraulic Cement.
- ASTM C778: Specification for Standard Sand (used in mortar testing).
- ASTM C1489: Specification for Lime Putty for Structural Purposes.
Hydrated lime for masonry is critical for achieving durable, high-performance mortars and plasters. ASTM C207-18 serves as the industry’s recognized benchmark for specifying and quality-assuring these essential materials in construction and restoration projects worldwide.
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Frequently Asked Questions
ASTM C207-18 is a technical specification published by ASTM International. Its full title is "Standard Specification for Hydrated Lime for Masonry Purposes". This standard covers: ABSTRACT This specification covers four types of hydrated lime. Type 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 under this specification shall be designated as Type N which is the normal hydrated lime for masonry purposes, type S which is the special hydrated lime for masonry purposes, type NA which is the normal air-entraining hydrated lime for masonry purposes and type SA which is the special air-entraining hydrated lime for masonry purposes. Hydrated lime for masonry purposes shall conform to the required chemical composition for calcium and magnesium oxides and carbon dioxide. The hydrated lime covered by Types N or S in this specification shall contain no additives for the purpose of entraining air. SCOPE 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. 1.2 The values stated in SI units are to be regarded as standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ABSTRACT This specification covers four types of hydrated lime. Type 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 under this specification shall be designated as Type N which is the normal hydrated lime for masonry purposes, type S which is the special hydrated lime for masonry purposes, type NA which is the normal air-entraining hydrated lime for masonry purposes and type SA which is the special air-entraining hydrated lime for masonry purposes. Hydrated lime for masonry purposes shall conform to the required chemical composition for calcium and magnesium oxides and carbon dioxide. The hydrated lime covered by Types N or S in this specification shall contain no additives for the purpose of entraining air. SCOPE 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. 1.2 The values stated in SI units are to be regarded as standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM C207-18 is classified under the following ICS (International Classification for Standards) categories: 91.100.10 - Cement. Gypsum. Lime. Mortar. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM C207-18 has the following relationships with other standards: It is inter standard links to ASTM C50/C50M-13(2019), ASTM C25-19e1, ASTM C110-16, ASTM C110-15, ASTM C110-15e1, ASTM C110-14e1, ASTM C110-14, ASTM C778-13, ASTM C50/C50M-13, ASTM C226-12, ASTM C50/C50M-12, ASTM C778-12, ASTM C110-11, ASTM C25-11e1, ASTM C110-10. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM C207-18 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C207 − 18
Standard Specification for
Hydrated Lime for Masonry Purposes
This standard is issued under the fixed designation C207; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
1.1 This specification covers four types of hydrated lime.
mendations issued by the World Trade Organization Technical
Types N and S are suitable for use in mortar, in scratch and
Barriers to Trade (TBT) Committee.
brown coats of cement plaster, for stucco, and for addition to
portland-cement concrete. Types NA and SA are air-entrained
2. Referenced Documents
hydrated limes that are suitable for use in any of the above uses
2.1 ASTM Standards:
where the inherent properties of lime and air-entrainment are
C25 Test Methods for Chemical Analysis of Limestone,
desired. The four types of lime sold under this specification
Quicklime, and Hydrated Lime
shall be designated as follows:
C50/C50M Practice for Sampling, Sample Preparation,
1.1.1 Type N—Normal hydrated lime for masonry purposes.
Packaging, and Marking of Lime and Limestone Products
1.1.2 Type S—Special hydrated lime for masonry purposes.
C110 Test Methods for Physical Testing of Quicklime,
1.1.3 Type NA—Normal air-entraining hydrated lime for
Hydrated Lime, and Limestone
masonry purposes.
C206 Specification for Finishing Hydrated Lime
1.1.4 Type SA—Special air-entraining hydrated lime for
C226 Specification for Air-Entraining Additions for Use in
masonry purposes.
the Manufacture of Air-Entraining Hydraulic Cement
NOTE 1—Type S, special hydrated lime, and Type SA, special air-
C778 Specification for Standard Sand
entraining hydrated lime, are differentiated from Type N, normal hydrated
C1489 Specification for Lime Putty for Structural Purposes
lime, and Type NA, normal air-entraining hydrated lime, principally by
their ability to develop high, early plasticity and higher water retentivity,
3. Terminology
and by a limitation on their unhydrated oxide content.
NOTE 2—For normal (Type N) and special (Type S) finishing hydrated
3.1 Definitions:
lime, refer to Specification C206.
3.1.1 standard mortar, n—a mortar containing only hydrated
NOTE 3—Some building codes prohibit the use of air-entraining
lime and sand meeting the requirements of Specification C778.
materials in mortar, because of the accompanying reduction in bond and
The mortar proportions are one part hydrated lime to three
compressive strength. Where increased freeze-thaw resistance is
important, air-entraining may be beneficial. Air-entraining lime should not
parts of sand by volume as indicated in Table 4 of Test
be used as a finishing lime.
Methods C110.
NOTE 4—For lime putty, refer to Specification C1489.
4. Additions
1.2 The values stated in SI units are to be regarded as
standard.
4.1 Types NA and SA hydrated lime covered by this
1.3 This standard does not purport to address all of the specification shall contain additives for the purpose of entrain-
ing air, and such additives shall conform to the requirements of
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- Specification C226.
priate safety, health, and environmental practices and deter-
5. Manufacturer’s Statement
mine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accor- 5.1 At the request of the purchaser, the manufacturer shall
dance with internationally recognized principles on standard- state in writing the nature, amount, and identity of the
air-entraining agent used and of any processing addition that
may have been used, and also, if requested, shall supply test
This specification is under the jurisdiction of ASTM Committee C07 on Lime
and Limestone and is the direct responsibility of Subcommittee C07.02 on
Specifications and Guidelines. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 1, 2018. Published November 2018. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1946. Last previous edition approved in 2011 as C207 – 06 (2011). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/C0207-18. the ASTM website.
Cop
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C207 − 06 (Reapproved 2011) C207 − 18
Standard Specification for
Hydrated Lime for Masonry Purposes
This standard is issued under the fixed designation C207; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
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.
1.2 The values stated in SI units are to be regarded as standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
C25 Test Methods for Chemical Analysis of Limestone, Quicklime, and Hydrated Lime
C50C50/C50M Practice for Sampling, Sample Preparation, Packaging, and Marking of Lime and Limestone Products
C110 Test Methods for Physical Testing of Quicklime, Hydrated Lime, and Limestone
C206 Specification for Finishing Hydrated Lime
C226 Specification for Air-Entraining Additions for Use in the Manufacture of Air-Entraining Hydraulic Cement
C778 Specification for Standard Sand
C1489 Specification for Lime Putty for Structural Purposes
3. Terminology
3.1 Definitions:
This specification is under the jurisdiction of ASTM Committee C07 on Lime and Limestone and is the direct responsibility of Subcommittee C07.02 on Specifications
and Guidelines.
Current edition approved June 1, 2011Oct. 1, 2018. Published July 2011November 2018. Originally approved in 1946. Last previous edition approved in 20062011 as
C207 – 06.C207 – 06 (2011). DOI: 10.1520/C0207-06R11.10.1520/C0207-18.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C207 − 18
3.1.1 standard mortar, n—a mortar containing only hydrated lime and sand meeting the requirements of Specification C778. The
mortar proportions are one part hydrated lime to three parts of sand by volume as indicated in Table 4 of Test Methods C110.
4. Additions
4.1 Types NA and SA hydrated lime covered by this specification shall contain additives for the purpose of entraining air, and
such additives shall conform to the requirements of Specification C226.
5. Manufacturer’s Statement
5.1 At the request of the purchaser, the manufacturer shall state in writing the nature, amount, and identity of the air-entraining
agent used and of any
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