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ASTM C1249-18(2023)

(Guide)

Standard Guide for Secondary Seal for Sealed Insulating Glass Units for Structural Sealant Glazing Applications

Standard Guide for Secondary Seal for Sealed Insulating Glass Units for Structural Sealant Glazing Applications

SIGNIFICANCE AND USE
4.1 It should be realized that the design of an IG unit edge seal for use in SSG systems is a collaborative effort of at least the IG unit fabricator, sealant manufacturer, and design professional, among others.  
4.2 This guide provides information on silicone sealants that are used for the secondary seal of IG units that are glazed into SSG systems.  
4.3 Information is also provided on the other major components of the IG unit edge seal, compatibility of components, durability, and quality assurance (QA).
SCOPE
1.1 This guide covers design and fabrication considerations for the edge seal of conventionally sealed insulating glass units, herein referred to as IG units. The IG units described are used in structural silicone sealant glazing systems, herein referred to as SSG systems. SSG systems typically are either two or four sided, glazed with a structural sealant. Other conditions such as one, three, five, six sided may be used.  
1.2 This guides does not cover the IG units of other than conventional edge seal design (Fig. 1); however, the information contained herein may be of benefit to the designers of such IG units.
FIG. 1 Sealed IG Edge Seal: Basic Components  
1.3 In an SSG system, IG units are retained to a metal framing system by a structural seal (Fig. 2). The size and shape of that seal, as well as numerous other SSG system design considerations, are not addressed in this guide.
FIG. 2 Typical A-Side SSG System Mullion: Horizontal Section (Vertical Joint)  
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.5 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.  
1.6 The committee with jurisdiction for this standard is not aware of any comparable standard guides published by other organizations.  
1.7 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-Jan-2023
ICS
81.040.20 - Glass in building
Technical Committee
C24 - Building Seals and Sealants
Drafting Committee
C24.10 - Specifications, Guides and Practices
Current Stage
Ref Project

Relations

Refers
ASTM C639-15(2020) - Standard Test Method for Rheological (Flow) Properties of Elastomeric Sealants
Effective Date
01-May-2020

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ASTM C1249-18(2023) - Standard Guide for Secondary Seal for Sealed Insulating Glass Units for Structural Sealant Glazing ApplicationsASTM C1249-18(2023) - Standard Guide for Secondary Seal for Sealed Insulating Glass Units for Structural Sealant Glazing Applications
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ASTM C1249-18(2023) - Standard Guide for Secondary Seal for Sealed Insulating Glass Units for Structural Sealant Glazing Applications
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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: C1249 − 18 (Reapproved 2023)
Standard Guide for
Secondary Seal for Sealed Insulating Glass Units for
1
Structural Sealant Glazing Applications
This standard is issued under the fixed designation C1249; 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 mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 This guide covers design and fabrication considerations
for the edge seal of conventionally sealed insulating glass
2. Referenced Documents
units, herein referred to as IG units. The IG units described are
2
2.1 ASTM Standards:
used in structural silicone sealant glazing systems, herein
C639 Test Method for Rheological (Flow) Properties of
referred to as SSG systems. SSG systems typically are either
Elastomeric Sealants
two or four sided, glazed with a structural sealant. Other
C679 Test Method for Tack-Free Time of Elastomeric Seal-
conditions such as one, three, five, six sided may be used.
ants
1.2 This guides does not cover the IG units of other than
C717 Terminology of Building Seals and Sealants
conventional edge seal design (Fig. 1); however, the informa-
C794 Test Method for Adhesion-in-Peel of Elastomeric Joint
tion contained herein may be of benefit to the designers of such
Sealants
IG units.
C1087 Test Method for Determining Compatibility of
1.3 In an SSG system, IG units are retained to a metal Liquid-Applied Sealants with Accessories Used in Struc-
framing system by a structural seal (Fig. 2). The size and shape
tural Glazing Systems
of that seal, as well as numerous other SSG system design C1135 Test Method for Determining Tensile Adhesion Prop-
considerations, are not addressed in this guide.
erties of Structural Sealants
C1184 Specification for Structural Silicone Sealants
1.4 The values stated in SI units are to be regarded as the
C1369 Specification for Secondary Edge Sealants for Struc-
standard. The values given in parentheses are for information
turally Glazed Insulating Glass Units
only.
E631 Terminology of Building Constructions
1.5 This standard does not purport to address all of the
E773 Test Method for Accelerated Weathering of Sealed
safety concerns, if any, associated with its use. It is the
3
Insulating Glass Units (Withdrawn 2010)
responsibility of the user of this standard to establish appro-
E2188 Test Method for Insulating Glass Unit Performance
priate safety, health, and environmental practices and deter-
E2189 Test Method for Testing Resistance to Fogging in
mine the applicability of regulatory limitations prior to use.
Insulating Glass Units
1.6 The committee with jurisdiction for this standard is not
E2190 Specification for Insulating Glass Unit Performance
aware of any comparable standard guides published by other
and Evaluation
organizations.
4
2.2 IGMA Standards:
1.7 This international standard was developed in accor-
TR-1000-75(91) Voluntary Test Methods for Chemical Ef-
dance with internationally recognized principles on standard-
fects of Glazing Compounds on Elastomeric Edge Seals
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
2
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
1
This guide is under the jurisdiction of ASTM Committee C24 on Building Seals Standards volume information, refer to the standard’s Document Summary page on
and Sealants and is the direct responsibility of Subcommittee C24.10 on the ASTM website.
3
Specifications, Guides and Practices. The last approved version of this historical standard is referenced on www.ast-
Current edition approved Feb. 1, 2023. Published February 2023. Originally m.org.
4
approved in 1993. Last previous edition approved in 2018 as C1249 – 18. DOI: Available from Insulating Glass Manufacturers Alliance (IGMA), 1500 Bank
10.1520/C1249-18R23. St., Ottawa, ON K1H 1B8, Canada, https://www.igmaonline.org/.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C1249 − 18 (2023)
3.2.5 structural seal—a joint seal of which the sealant
structurally adheres an IG unit to a metal framing system (see
Fig. 2).
3.2.5.1 Discussion—The structural seal transfers applied
loads to the framing system as well as accommodates differ-
...

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5.1 Frequently IG units are adhered with a structural sealant to a metal framing system. In such applications, only the inward lite of glass is usually adhered to the frame. As a result, a significant portion of any outward-acting or negative wind load must be carried in tension by the joint seal between the two lites of the IG unit. This test will not provide information on the integrity of the IG unit primary seal; however, it may provide data on load sharing between the primary IG vapor seal and the secondary structural sealant.  
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1.1 This test method covers a laboratory procedure for quantitatively measuring the tensile strength, stiffness, and adhesion properties of insulating glass edge seals that are used in structural sealant glazing applications. Edge seals for these applications use a structural sealant to bond both glass lites and the edge spacer into a monolithic sealed insulating glass unit. In typical applications, the structural sealant acts to hold the outside lite in place under wind and gravity load and to maintain the edge spacer in its proper position. Hereafter, the term “insulating glass” will be abbreviated as “IG.”  
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1.3 The values determined by this test method will be characteristic of the particular edge seal assembly that is tested.  
Note 1: Presently, only elastomeric, chemically curing silicone sealants specifically formulated for use as the secondary seal of IG units are recognized as having the necessary durability for use in structural sealant glazing applications.  
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4.1 Guidelines are provided for the procedures to evaluate existing SSG installations, including two- and four-sided installations. Due to the unlimited range of materials that may be used in a particular building, the information contained in this guide is general in nature. For a discussion of new SSG installations, refer to Guide C1401.  
4.2 Typical conditions are listed that might be discovered during, or suggest the need for, such evaluations. Guidelines are also suggested for times to perform evaluations. These guidelines are also necessarily general. Professional judgment of a qualified person should be used in determining the appropriate time to perform an evaluation on a particular building.  
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1.2 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.

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1.1 This test method covers a simple beaker-type procedure for evaluating the effects of heat transfer fluids (HTF) on metal specimens under controlled laboratory conditions. Fluids tested under this method are specifically designed for heating and air conditioning (HVAC) systems.  
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5.1 Solar-energy transmittance and reflectance are important factors in the heat admission through fenestration, most commonly through glass or plastics. (See Appendix X3.) These methods provide a means of measuring these factors under fixed conditions of incidence and viewing. While the data may be of assistance to designers in the selection and specification of glazing materials, the solar-energy transmittance and reflectance are not sufficient to define the rate of heat transfer without information on other important factors. The methods have been found practical for both transparent and translucent materials as well as for those with transmittances reduced by highly reflective coatings. Method B is particularly suitable for the measurement of transmittance of inhomogeneous, patterned, or corrugated materials since the transmittance is averaged over a large area.
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Standard Practice for Determining the Thickness of Glass in Airport Traffic Control Tower Cabs

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5.1 This standard procedure facilitates determination of the thickness of a glass construction required to resist a specified design load with a selected probability of breakage.  
5.2 For optical purposes, ATCT cab glass typically utilize only annealed glass products. For this reason, some specifying authorities mandate its use and prohibit heat-strengthened and tempered glass in control cabs. This standard procedure therefore addresses the following glass constructions: annealed monolithic, annealed laminated, and insulating glass fabricated with annealed monolithic or annealed laminated glass, or both. In cases where the specifying authority approves the use of heat-strengthened or fully tempered glass in the control cab or in areas where optical characteristics do not apply but are deemed critical to the facility operation, the NFL values obtained from standard may be adjusted using appropriate Glass Type Factors (GTF) and procedures for their use as specified in Practice E1300.  
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1.7 The procedures do not apply to drilled, notched, or grooved glass.  
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1.10 These procedures do not apply to triple-glazed insulating glass units.  
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ASTM C1265-22(Test Method)
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SIGNIFICANCE AND USE
5.1 Frequently IG units are adhered with a structural sealant to a metal framing system. In such applications, only the inward lite of glass is usually adhered to the frame. As a result, a significant portion of any outward-acting or negative wind load must be carried in tension by the joint seal between the two lites of the IG unit. This test will not provide information on the integrity of the IG unit primary seal; however, it may provide data on load sharing between the primary IG vapor seal and the secondary structural sealant.  
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1.3 The values determined by this test method will be characteristic of the particular edge seal assembly that is tested.  
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Standard Test Method for Accelerated Aging of Electrochromic Devices in Sealed Insulating Glass Units

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4.1 EC glazings perform a number of important functions in a building envelope including: minimizing the solar energy heat gain; providing for passive solar energy gain; controlling a variable visual connection with the outside world; enhancing human comfort (heat gain), illumination, and glare control; and providing for architectural expression. It is therefore important to understand the relative serviceability of these glazings.  
4.2 This test method is intended to provide a means for evaluating the relative serviceability of EC Glazings as described in Section 1.  
4.3 The procedures in this test method include (a) rapid but realistic current-voltage cycling tests emphasizing the electrical properties, and (b) environmental test parameters that are typically used in weatherability tests by standards organizations and are realistic for the intended use of large-area EC IGUs.
SCOPE
1.1 This test method covers the accelerated aging of electrochromic devices (ECD) integrated in insulating glass units.  
1.2 The test method is applicable for any electrochromic device incorporated into sealed insulating glass units (IGUs) fabricated for vision glass (superstrate and substrate) areas for use in buildings, such as sliding doors, windows, skylights, and exterior wall systems. The layers used for constructing the EC device and electrochromically changing the optical properties may be inorganic or organic materials.  
1.3 The electrochromic (EC) glazings used in this test method are exposed to environmental conditions, including solar radiation. They are employed to control the amount of transmitted radiation by absorption and reflection and, thus, limit the solar heat gain and amount of solar radiation that is transmitted into the building.  
1.4 The test method is not applicable to other chromogenic devices, such as, photochromic and thermochromic devices which do not respond to electrical stimulus.  
1.5 The test method is not applicable to electrochromic (EC) glazings that are constructed from superstrate or substrate materials other than glass.  
1.6 The test method referenced herein is a laboratory test conducted under specified conditions. The test is intended to simulate and, in some cases, to also accelerate actual in-service use of the electrochromic glazing. Results from these tests cannot be used to predict the performance with time of in-service units unless actual corresponding in-service tests have been conducted and appropriate analyses have been conducted to show how performance can be predicted from the accelerated aging tests.  
1.7 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.8 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.  
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Standard Test Method for Security Glazing Materials And Systems

SIGNIFICANCE AND USE
6.1 This test method is based on field experience rather than laboratory analysis. It provides a basis for the comparative evaluation of ballistic/forced entry/containment resistance of security glazings and systems and should not be used to establish or confirm the absolute prevention of forcible entries or forced exits. This test method defines three factors which determine the success or failure of any attempt to forcefully enter (or exit) the glazing or system. They are: (1) the tools employed, (2) the techniques and methods used by the attackers, and (3) the total time available to effect the entry or exit. This test method defines two of the three factors (tools and techniques) and allows the third (duration) to vary in order to establish levels of forced entry or exit resistance.
SCOPE
1.1 This test method sets forth procedures whose purpose is limited to the evaluation of the resistance of security glazing materials and systems against the following threats:  
1.1.1 Ballistic Impact,  
1.1.2 Blunt Tool Impacts,  
1.1.3 Sharp Tool Impacts,  
1.1.4 Thermal Stress,  and  
1.1.5 Chemical Deterioration.
Note 1: Specifically exempted from this test method are the use of power (motor or engine-driven) tools or devices, explosives, military ordinance (excepting small arms) and tools, processes or devices requiring more than two persons to transport and operate.  
1.2 The values stated in inch-pounds are to be regarded as the standard. The values given in parentheses are for information only.  
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. For a specific warning statement, see Warning in 10.1.1.6.  
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5.2 Source Fields—Performance of a shielded enclosure and glazing or glazing configurations are to be assessed for three source fields: magnetic, electric, and plane wave.
SCOPE
1.1 This test method covers the determination of the electromagnetic shielding effectiveness of glazings or glazing configurations.  
1.1.1 The intended application of this test method is for glazings or glazing configurations to be evaluated for their transmittance or shielding capability to electromagnetic frequencies.  
1.1.2 This is a component test. It is not applicable to full systems such as walls, floors, ceilings, shielded racks, or window systems.  
1.1.3 The intention of this test method is to standardize a measurement procedure for glazings or glazing configurations, with and without coatings, films, interlayers, or other enhancements, as single or insulating units at a standard size and when mounted in a standardized frame.  
1.1.4 This test method is to provide a means of generating data for the glazing or glazing configuration infills that can be used by the consumer, designer, and system manufacturer to understand the capability and contribution of glazings or glazing configurations to a system used for Electromagnetic Interference (EMI) security.  
1.2 This test method is for use in the assessment of EMI transmittance for frequency ranges 100 kHz to 20 GHz. Specific test frequencies within these ranges are required.  
1.3 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4 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. Some specific hazards statements are given in Section 8 on Hazards.  
1.5 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.

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4.1 Glass is a brittle material with different time and temperature-dependent properties than other solid materials used as walkways surfaces. Therefore, the type of glass is an important consideration in the design and construction of glass treads and glass landings constructed with laminated glass.  
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4.3 The structural design shall be confirmed by calculations by a licensed design professional in accordance with Section 5.  
4.4 If testing is required (see 4.4.1 – 4.4.3) to verify post-glass breakage behavior of the glass walkway, the testing shall be in accordance with Section 6.  
4.4.1 For laminates with two glass plies, verification testing is required.  
4.4.2 For laminates with more than two glass plies, verification testing is not required provided that calculations completed in accordance with 4.3 demonstrate that the glass assembly has sufficient strength to sustain the full design load with any one glass ply broken.  
4.4.3 When verifying post-breakage behavior by calculation, allowable glass stress for 10 min load duration in accordance with Table 1 shall be used for all load cases.  
4.5 The manufacturer or designer of glass walkway systems shall provide installation directions and fabrication and installation tolerances of their systems.  
4.6 The structural integrity of the glass walkway system after glass breakage shall be sufficient to support the design loads after any one glass ply is broken. If damage of any kind occurs, the walkway shall be cordoned off and the installation shall be inspected to ensure structural integrity and pedestrian safety of the system.
SCOPE
1.1 This practice addresses elements related to load-bearing glass walkways, glass treads, and glass landings constructed with laminated glass. This standard includes performance, design, and safe behavior considerations. It addresses the characteristics unique to glass and laminated glass. Issues that are common to all walkways, such as slip resistance, are addressed in existing referenced standards.  
1.2 This practice does not address glass walkways constructed with monolithic glass, glass block, insulating glass units, glass tiles that are directly bonded to a non-glass structural substrate, or glass walkways intended to support vehicular traffic.  
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
1.4 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.  
1.5 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.

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  • Standard
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    English language
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