ASTM C1518-22
(Specification)Standard Specification for Precured Elastomeric Silicone Joint Sealants
Standard Specification for Precured Elastomeric Silicone Joint Sealants
ABSTRACT
This specification describes the properties of applied, flat shaped precured elastomeric silicone joint sealants that bridge joint openings and are adhered to joint substrates utilizing a liquid applied silicone adhesive sealant to seal building openings such as panel joints, metal flashing joints, or other building openings in place of conventional liquid applied sealants. Seals are applied in three different configurations, as follows: as a bridge joint, the seal is applied flat on the surface to cover a joint opening; as a beveled bridge joint, the seal is applied on the beveled edge of a substrate to bridge a joint opening.; as a U-joint, the seal is applied in a U-configuration within a joint. Seals are classified into Movement Classes on the basis of movement capability, and Tear Class on the basis of tear propagation. Seals should adhere to specified requirements as to stability, color and texture, application, adhesion and cohesion, and movement, modulus, and tear characteristics.
SCOPE
1.1 Precured elastomeric silicone joint sealants, hereinafter referred to as seal, are manufactured in flat, cured, extruded shapes and are primarily used to span joint openings in construction. This specification describes the properties of applied, flat shaped precured elastomeric silicone joint sealants, hereinafter referred to as applied seal, that bridge joint openings and are adhered to joint substrates utilizing a liquid applied silicone adhesive sealant, specified by the manufacturer, hereinafter referred to as adhesive to construction substrates, to seal building openings such as panel joints, metal flashing joints, or other building openings in place of conventional liquid applied sealants.
1.2 Seals are applied in three different configurations:
1.2.1 As a bridge joint, the seal is applied flat on the surface to cover a joint opening. See Fig. 1.
FIG. 1 Bridge Joint Configuration
1.2.2 As a beveled bridge joint, the seal is applied on the beveled edge of a substrate to bridge a joint opening. See Fig. 2.
FIG. 2 Beveled Bridge Joint Configuration
1.2.3 As a U-joint, the seal is applied in a U-configuration within a joint. See Fig. 3.
FIG. 3 U-Joint Configuration
1.3 This specification is for a flat extruded shape.
1.4 An applied seal meeting the requirements of this specification shall be designated by the manufacturer as to movement class and tear class as described in Section 5.
1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.
1.6 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
- 31-May-2022
- Technical Committee
- C24 - Building Seals and Sealants
- Drafting Committee
- C24.10 - Specifications, Guides and Practices
Relations
- Effective Date
- 01-Mar-2019
- Effective Date
- 01-Mar-2018
- Effective Date
- 01-Nov-2017
- Effective Date
- 01-Jun-2017
- Effective Date
- 01-Jan-2017
- Effective Date
- 15-Nov-2016
- Effective Date
- 01-Sep-2016
- Effective Date
- 01-May-2014
- Effective Date
- 01-Mar-2014
- Effective Date
- 01-Feb-2014
- Effective Date
- 01-Nov-2013
- Effective Date
- 01-Dec-2012
- Effective Date
- 01-May-2012
- Effective Date
- 15-Jan-2012
- Effective Date
- 01-Apr-2011
Overview
ASTM C1518-22: Standard Specification for Precured Elastomeric Silicone Joint Sealants establishes requirements for precured, flat-shaped elastomeric silicone joint sealants developed to bridge and seal joint openings in building construction. This standard, developed by ASTM International, covers sealant properties, configurations, and classification criteria, providing guidance for their use as a robust alternative to conventional liquid-applied sealants. These silicone seals are adhered to construction substrates using a liquid-applied silicone adhesive and are widely employed in sealing building openings such as panel joints and metal flashing joints.
Key Topics
Seal Configurations:
The standard defines three primary configurations for applied seals:- Bridge joint - Seal is applied flat over a joint opening.
- Beveled bridge joint - Seal is installed along the beveled edge of a substrate to span an opening.
- U-joint - Seal is positioned in a U-shaped orientation within a joint opening.
Classification Criteria:
Sealants covered by ASTM C1518-22 are classified by:- Movement Class - Based on their ability to accommodate joint movement under temperature and weathering conditions.
- Tear Class - According to their resistance to tear propagation, including classes such as NT (Non-Tear), PT (Partial Tear), and T (Tear).
Performance Requirements:
The document outlines physical, adhesion, cohesion, color, texture, movement capability, modulus, and tear characteristics.- Must withstand specific cycles of expansion and contraction.
- Tested for adhesion and cohesion using standardized methods.
- Must maintain integrity and performance after exposure to various environmental conditions.
Packaging and Marking:
Manufacturers must clearly mark packaging with movement class, modulus at the representative strain, and tear characterization to ensure users select the appropriate seal for their application.
Applications
Precured elastomeric silicone joint sealants specified by ASTM C1518-22 provide a high-performance solution for various building applications, including:
- Panel joints and curtain walls:
Superior flexibility and weather resistance make these sealants ideal for exterior panel joints, often exposed to structural movement and the elements. - Metal flashing joints:
The chemical stability of silicone makes these seals suitable for metal interfaces, preventing water ingress and corrosion. - Retrofit and repair:
These precured sealants enable efficient retrofitting, replacing failed or aged liquid sealants without extensive substrate preparation. - Specialty joints:
Their form factor and configurations (bridge, beveled, U-joint) allow for custom solutions in architectural designs requiring joint bridging.
Related Standards
Implementing ASTM C1518-22 may require familiarity with associated ASTM standards, including:
- ASTM C717 – Terminology of Building Seals and Sealants
- ASTM C1442 – Practice for Conducting Tests on Sealants Using Artificial Weathering Apparatus
- ASTM C1523 – Test Method for Determining Modulus, Tear and Adhesion Properties of Precured Elastomeric Joint Sealants
- ASTM D1566 – Terminology Relating to Rubber
- ASTM G113 – Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials
Practical Value
Adhering to ASTM C1518-22 ensures reliability, longevity, and compatibility for building sealants in construction joints. By specifying requirements for movement capability, tear resistance, and adhesion, this standard helps architects, specifiers, and contractors select and apply joint sealants that perform under real-world conditions, reducing maintenance and enhancing building envelope durability. Using precured elastomeric silicone joint sealants that conform to this specification supports high-quality, long-term construction outcomes and compliance with international building codes.
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Frequently Asked Questions
ASTM C1518-22 is a technical specification published by ASTM International. Its full title is "Standard Specification for Precured Elastomeric Silicone Joint Sealants". This standard covers: ABSTRACT This specification describes the properties of applied, flat shaped precured elastomeric silicone joint sealants that bridge joint openings and are adhered to joint substrates utilizing a liquid applied silicone adhesive sealant to seal building openings such as panel joints, metal flashing joints, or other building openings in place of conventional liquid applied sealants. Seals are applied in three different configurations, as follows: as a bridge joint, the seal is applied flat on the surface to cover a joint opening; as a beveled bridge joint, the seal is applied on the beveled edge of a substrate to bridge a joint opening.; as a U-joint, the seal is applied in a U-configuration within a joint. Seals are classified into Movement Classes on the basis of movement capability, and Tear Class on the basis of tear propagation. Seals should adhere to specified requirements as to stability, color and texture, application, adhesion and cohesion, and movement, modulus, and tear characteristics. SCOPE 1.1 Precured elastomeric silicone joint sealants, hereinafter referred to as seal, are manufactured in flat, cured, extruded shapes and are primarily used to span joint openings in construction. This specification describes the properties of applied, flat shaped precured elastomeric silicone joint sealants, hereinafter referred to as applied seal, that bridge joint openings and are adhered to joint substrates utilizing a liquid applied silicone adhesive sealant, specified by the manufacturer, hereinafter referred to as adhesive to construction substrates, to seal building openings such as panel joints, metal flashing joints, or other building openings in place of conventional liquid applied sealants. 1.2 Seals are applied in three different configurations: 1.2.1 As a bridge joint, the seal is applied flat on the surface to cover a joint opening. See Fig. 1. FIG. 1 Bridge Joint Configuration 1.2.2 As a beveled bridge joint, the seal is applied on the beveled edge of a substrate to bridge a joint opening. See Fig. 2. FIG. 2 Beveled Bridge Joint Configuration 1.2.3 As a U-joint, the seal is applied in a U-configuration within a joint. See Fig. 3. FIG. 3 U-Joint Configuration 1.3 This specification is for a flat extruded shape. 1.4 An applied seal meeting the requirements of this specification shall be designated by the manufacturer as to movement class and tear class as described in Section 5. 1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.6 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 describes the properties of applied, flat shaped precured elastomeric silicone joint sealants that bridge joint openings and are adhered to joint substrates utilizing a liquid applied silicone adhesive sealant to seal building openings such as panel joints, metal flashing joints, or other building openings in place of conventional liquid applied sealants. Seals are applied in three different configurations, as follows: as a bridge joint, the seal is applied flat on the surface to cover a joint opening; as a beveled bridge joint, the seal is applied on the beveled edge of a substrate to bridge a joint opening.; as a U-joint, the seal is applied in a U-configuration within a joint. Seals are classified into Movement Classes on the basis of movement capability, and Tear Class on the basis of tear propagation. Seals should adhere to specified requirements as to stability, color and texture, application, adhesion and cohesion, and movement, modulus, and tear characteristics. SCOPE 1.1 Precured elastomeric silicone joint sealants, hereinafter referred to as seal, are manufactured in flat, cured, extruded shapes and are primarily used to span joint openings in construction. This specification describes the properties of applied, flat shaped precured elastomeric silicone joint sealants, hereinafter referred to as applied seal, that bridge joint openings and are adhered to joint substrates utilizing a liquid applied silicone adhesive sealant, specified by the manufacturer, hereinafter referred to as adhesive to construction substrates, to seal building openings such as panel joints, metal flashing joints, or other building openings in place of conventional liquid applied sealants. 1.2 Seals are applied in three different configurations: 1.2.1 As a bridge joint, the seal is applied flat on the surface to cover a joint opening. See Fig. 1. FIG. 1 Bridge Joint Configuration 1.2.2 As a beveled bridge joint, the seal is applied on the beveled edge of a substrate to bridge a joint opening. See Fig. 2. FIG. 2 Beveled Bridge Joint Configuration 1.2.3 As a U-joint, the seal is applied in a U-configuration within a joint. See Fig. 3. FIG. 3 U-Joint Configuration 1.3 This specification is for a flat extruded shape. 1.4 An applied seal meeting the requirements of this specification shall be designated by the manufacturer as to movement class and tear class as described in Section 5. 1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.6 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 C1518-22 is classified under the following ICS (International Classification for Standards) categories: 83.060 - Rubber. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM C1518-22 has the following relationships with other standards: It is inter standard links to ASTM C717-19, ASTM C717-18, ASTM C717-17a, ASTM C1523-17, ASTM C717-17, ASTM C717-16a, ASTM C717-16, ASTM C717-14a, ASTM G113-14, ASTM C717-14, ASTM C717-13, ASTM C717-12b, ASTM C717-12a, ASTM C717-12, ASTM C1442-11. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM C1518-22 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: C1518 −22
Standard Specification for
Precured Elastomeric Silicone Joint Sealants
This standard is issued under the fixed designation C1518; 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.
1. Scope 2. Referenced Documents
2.1 ASTM Standards:
1.1 Precured elastomeric silicone joint sealants, hereinafter
C717 Terminology of Building Seals and Sealants
referred to as seal, are manufactured in flat, cured, extruded
C1442 Practice for Conducting Tests on Sealants Using
shapes and are primarily used to span joint openings in
Artificial Weathering Apparatus
construction. This specification describes the properties of
C1523 Test Method for Determining Modulus, Tear and
applied, flat shaped precured elastomeric silicone joint
Adhesion Properties of Precured Elastomeric Joint Seal-
sealants,hereinafterreferredtoasappliedseal,thatbridgejoint
ants
openings and are adhered to joint substrates utilizing a liquid
D1566 Terminology Relating to Rubber
applied silicone adhesive sealant, specified by the
G113 Terminology Relating to Natural andArtificial Weath-
manufacturer, hereinafter referred to as adhesive to construc-
ering Tests of Nonmetallic Materials
tion substrates, to seal building openings such as panel joints,
metal flashing joints, or other building openings in place of
3. Terminology
conventional liquid applied sealants.
3.1 Definitions:
1.2 Seals are applied in three different configurations:
3.1.1 Refer to Terminology C717 for definitions of terms
1.2.1 As a bridge joint, the seal is applied flat on the surface
used in this standard, including but not limited to the follow-
to cover a joint opening. See Fig. 1.
ing: cohesive failure, adhesive failure, elastomeric, elongation,
1.2.2 As a beveled bridge joint, the seal is applied on the
joint, modulus, primer, seal, sealant, shelf-life, substrate.
beveled edge of a substrate to bridge a joint opening. See Fig.
3.1.2 Refer to Terminology G113 for definitions related to
2.
artificial weathering.
1.2.3 As a U-joint, the seal is applied in a U-configuration
3.1.3 Refer to Terminology D1566 for tear.
within a joint. See Fig. 3.
4. Significance and Use
1.3 This specification is for a flat extruded shape.
4.1 This specification describes several classifications of
1.4 An applied seal meeting the requirements of this speci-
appliedsealsasdescribedinSection5.Thepurchaserordesign
fication shall be designated by the manufacturer as to move-
professional shall recognize that not all materials meeting this
ment class and tear class as described in Section 5.
specification are suitable for all applications and substrates. It
is essential, therefore, that the proper classification of the seal
1.5 The values stated in SI units are to be regarded as
system is provided for the intended use. The test methods in
standard. The values given in parentheses after SI units are
this specification relate to elastomeric performance, adhesion
provided for information only and are not considered standard.
of the adhesive to the seal and adhesion of the adhesive to the
1.6 This international standard was developed in accor-
substrate, only as adhesion relates to the test specimens. The
dance with internationally recognized principles on standard-
standard substrate for qualification to this specification is
ization established in the Decision on Principles for the
portland cement mortar. The standard joint configuration for
Development of International Standards, Guides and Recom-
qualification to this specification is the bridge joint configura-
mendations issued by the World Trade Organization Technical
tion as shown in Fig. 1. Users are advised to have adhesion
Barriers to Trade (TBT) Committee.
evaluations performed in the field on the actual substrate(s) to
determine adhesion performance.
NOTE 1—Other joint configurations such as beveled bridge joint
This specification is under the jurisdiction of ASTM Committee C24 on
Building Seals and Sealants and is the direct responsibility of Subcommittee C24.10
on Specifications, Guides and Practices. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved June 1, 2022. Published June 2022. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2002. Last previous edition approved in 2016 as C1518–16. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C1518-22. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1518 − 22
5.1.2 Immediately following 5.1.1 the same specimen shall
withstand 10 movement cycles of X % elongation where X is
the percentage used in 5.1.1 and relaxation to 0 %.
5.2 Tear Class NT, PT and Class T—Immediately following
5.1.2 the same specimen shall be tested for tear propagation as
described in Test Method C1523 (9.4).
6. General Requirements
FIG. 1 Bridge Joint Configuration
6.1 The shelf-life of this seal shall be determined by its
manufacturer. When establishing the shelf-life, the manufac-
turer should also identify acceptable conditions of storage for
the seal.
6.2 Color and Texture—The color and texture of the ex-
posed seal surface shall be the
...
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: C1518 − 16 C1518 − 22
Standard Specification for
Precured Elastomeric Silicone Joint Sealants
This standard is issued under the fixed designation C1518; 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.
1. Scope
1.1 Precured elastomeric silicone joint sealants, hereinafter referred to as seal, are manufactured in flat, cured, extruded shapes and
are primarily used to span joint openings in construction. This specification describes the properties of applied, flat shaped precured
elastomeric silicone joint sealants, hereinafter referred to as applied seal, that bridge joint openings and are adhered to joint
substrates utilizing a liquid applied silicone adhesive sealant, specified by the manufacturer, hereinafter referred to as adhesive to
construction substrates, to seal building openings such as panel joints, metal flashing joints, or other building openings in place
of conventional liquid applied sealants.
1.2 Seals are applied in three different configurations:
1.2.1 As a bridge joint, the seal is applied flat on the surface to cover a joint opening. See Fig. 1.
1.2.2 As a beveled bridge joint, the seal is applied on the beveled edge of a substrate to bridge a joint opening. See Fig. 2.
1.2.3 As a U-joint, the seal is applied in a U-configuration within a joint. See Fig. 3.
1.3 This specification is for a flat extruded shape. A three-dimensional shape used at a joint cross section or termination is being
considered for future inclusion in the specification.
1.4 An applied seal meeting the requirements of this specification shall be designated by the manufacturer as to movement class
and tear class as described in Section 5.
1.5 The values stated in SI units are to be regarded as the standard. The values given in brackets are for information
only.parentheses after SI units are provided for information only and are not considered standard.
1.6 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:
This specification is under the jurisdiction of ASTM Committee C24 on Building Seals and Sealants and is the direct responsibility of Subcommittee C24.10 on
Specifications, Guides and Practices.
Current edition approved June 1, 2016June 1, 2022. Published July 2016June 2022. Originally approved in 2002. Last previous edition approved in 20142016 as
C1518 - 04 (2014).C1518–16. DOI: 10.1520/C1518-16.10.1520/C1518-22.
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
C1518 − 22
FIG. 1 Bridge Joint Configuration
FIG. 2 Beveled Bridge Joint Configuration
FIG. 3 U-Joint Configuration
C717 Terminology of Building Seals and Sealants
C1442 Practice for Conducting Tests on Sealants Using Artificial Weathering Apparatus
C1523 Test Method for Determining Modulus, Tear and Adhesion Properties of Precured Elastomeric Joint Sealants
D1566 Terminology Relating to Rubber
G113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials
3. Terminology
3.1 Definitions:
3.1.1 Refer to Terminology C717 for definitions of terms used in this standard, including but not limited to the following: cohesive
failure, adhesive failure, elastomeric, elongation, joint, modulus, primer, seal, sealant, shelf-life, substrate.
3.1.2 Refer to Terminology G113 for definitions related to artificial weathering.
3.1.3 Refer to Terminology D1566 for tear.
4. Significance and Use
4.1 This specification describes several classifications of applied seals as described in Section 5. The purchaser or design
professional shall recognize that not all materials meeting this specification are suitable for all applications and substrates. It is
essential, therefore, that the proper classification of the seal system is provided for the intended use. The test methods in this
specification relate to elastomeric performance, adhesion of the adhesive to the seal and adhesion of the adhesive to the substrate,
only as adhesion relates to the test specimens. The standard substrate for qualification to this specification is portland cement
C1518 − 22
mortar. The standard joint configuration for qualification to this specification is the bridge joint configuration as shown in Fig. 1.
Users are advised to have adhesion testsevaluations performed in the field on the actual substratesubstrate(s) to determine adhesion
performance.
NOTE 1—Other joint configurations such as beveled bridge joint application and/or U-joint application in place or in addition to the standard joint
configuration may be specified for the test with the applied seal sample.
NOTE 2—Other substrates such as EIFS, brick, wood, aluminum, plastic, metal or other in place or in addition to the standard substrate may be specified
for the test with the applied seal sample.
5. Classification
5.1 Movement Class—A seal qualifying under this specification shall be c
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