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ASTM C1249-06a

(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
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.
This guide provides information on silicone sealants that are used for the secondary seal of IG units that are glazed into SSG systems.
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.
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.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
1.5 The committee with jurisdiction for this standard is not aware of any comparable standard guides published by other organizations.
1.6 This test method determines the thoroughness of mixing of a multi-component sealant.
1.7 This test method determines whether the rate of cure of a mixed sealant sample is within the sealant manufacturer's written specifications.
1.8 This test method determines whether there is adequate adhesion of a sealant to the surface of a spacer.

General Information

Status
Historical
Publication Date
31-Aug-2006
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

Replaces
ASTM C1249-06 - Standard Guide for Secondary Seal for Sealed Insulating Glass Units for Structural Sealant Glazing Applications
Effective Date
01-Sep-2006
Replaced By
ASTM C1249-06a(2010) - Standard Guide for Secondary Seal for Sealed Insulating Glass Units for Structural Sealant Glazing Applications
Effective Date
01-Jun-2010
Referred By
ASTM C1401-23 - Standard Guide for Structural Sealant Glazing
Effective Date
01-Sep-2006
Referred By
ASTM C1193-16(2023) - Standard Guide for Use of Joint Sealants
Effective Date
01-Sep-2006
Referred By
ASTM E2190-19 - Standard Specification for Insulating Glass Unit Performance and Evaluation
Effective Date
01-Sep-2006
Referred By
ASTM C1369-19 - Standard Specification for Secondary Edge Sealants for Structurally Glazed Insulating Glass Units
Effective Date
01-Sep-2006

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ASTM C1249-06a - Standard Guide for Secondary Seal for Sealed Insulating Glass Units for Structural Sealant Glazing ApplicationsASTM C1249-06a - Standard Guide for Secondary Seal for Sealed Insulating Glass Units for Structural Sealant Glazing Applications
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ASTM C1249-06a - Standard Guide for Secondary Seal for Sealed Insulating Glass Units for Structural Sealant Glazing Applications
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information.
Designation:C1249–06a
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.Anumber 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 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 informa-
tioncontainedhereinmaybeofbenefittothedesignersofsuch
IG units.
1.3 In an SSG system, IG units are retained to a metal
FIG. 1 Sealed IG Edge Seal: Basic Components
framingsystembyastructuralseal(Fig.2).Thesizeandshape
of that seal, as well as numerous other SSG system design
C717 Terminology of Building Seals and Sealants
considerations, are not addressed in this guide.
C794 Test Method for Adhesion-in-Peel of Elastomeric
1.4 The values stated in SI units are to be regarded as the
Joint Sealants
standard. The values given in parentheses are for information
C1087 Test Method for Determining Compatibility of
only.
Liquid-Applied Sealants with Accessories Used in Struc-
1.5 This standard does not purport to address all of the
tural Glazing Systems
safety problems, if any, associated with its use. It is the
C1135 Test Method for Determining Tensile Adhesion
responsibility of the user of this standard to establish appro-
Properties of Structural Sealants
priate safety and health practices and determine the applica-
C1184 Specification for Structural Silicone Sealants
bility of regulatory limitations prior to use.
E631 Terminology of Building Constructions
1.6 The committee with jurisdiction for this standard is not
E773 Test Method for Accelerated Weathering of Sealed
aware of any comparable standard guides published by other
Insulating Glass Units
organizations.
E774 SpecificationfortheClassificationoftheDurabilityof
3
Sealed Insulating Glass Units
2. Referenced Documents
E2188 Test Method for Insulating Glass Unit Performance
2
2.1 ASTM Standards:
E2189 Test Method for Testing Resistance to Fogging in
C639 Test Method for Rheological (Flow) Properties of
Insulating Glass Units
Elastomeric Sealants
E2190 Specification for Insulating Glass Unit Performance
C679 Test Method for Tack-Free Time of Elastomeric
and Evaluation
Sealants
2.2 Other Standards:
Igma 73-8-2B Test Methods for Chemical Effects of
1
4
ThisguideisunderthejurisdictionofASTMCommitteeC24onBuildingSeals
Glazing Compounds on Elastomeric Edge Seals
and Sealants and is the direct responsibility of Subcommittee C24.10 on Specifi-
cations, Guides and Practices.
3. Terminology
Current edition approved Sept. 1, 2006. Published September 2006. Originally
approved in 1993. Last previous edition approved in 2006 as C1249–06. DOI: 3.1 Definitions:
10.1520/C1249-06A.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Withdrawn. The last approved version of this historical standard is referenced
Standards volume information, refer to the standard’s Document Summary page on on www.astm.org.
4
the ASTM website. Available from IGMA, 111 E. Wacker Dr., Ste. 600, Chicago, IL 60601.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
C1249–06a
FIG. 2 Typical A-Side SSG System Mullion: Horizontal Section (Vertical Joint)
3.1.1 Refer to Terminology C717 for definitions of the 3.3.8 H =height, m (ft).
following terms used in this guide: adhesive failure, bead, 3.3.9 L =perimeter length, m (ft).
2 2
cohesive failure, compatibility, cure, elongation, gasket, glaz- 3.3.10 M =mass per unit area, N/m (lb/ft ).
2
ing, joint, lite, modulus, non-sag sealant, seal, sealant, sealant 3.3.11 P =applied load, Pa (lbf/ft ).
backing, setting block, shelf-life, silicone sealant, spacer, 3.3.12 W =width, m (ft).
structural sealant, substrate, tooling, and working life. Refer to
4. Significance and Use
Terminology E631 for the definition of sealed insulating glass
4.1 It should be realized that the design of an IG unit edge
as used in this guide.
seal for use in SSG systems is a collaborat
...

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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.  
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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.  
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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.  
5.2 Although this test method prescribes one environmental condition, other environmental conditions and exposure cycles can be employed for specific project evaluation. Such deviations should be described when reporting the data.
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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.”  
1.2 The characterization of the IG secondary sealant properties, as defined by this test method, are strongly dependent on glass and edge spacer cleaning procedures, IG spacer profile, location of spacer, and primary IG sealant application. Users of this test method must recognize that the IG edge seal assembly influences the secondary sealant properties.  
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.  
1.4 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.  
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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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1.1 These test methods cover the measurement of solar energy transmittance and reflectance (terrestrial) of materials in sheet form. Method A, using a spectrophotometer, is applicable for both transmittance and reflectance and is the referee method. Method B is applicable only for measurement of transmittance using a pyranometer in an enclosure and the sun as the energy source. Specimens for Method A are limited in size by the geometry of the spectrophotometer while Method B requires a specimen 0.61 m2 (2 ft2). For the materials studied by the drafting task group, both test methods give essentially equivalent results.  
1.2 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 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.  
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SCOPE
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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.  
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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.  
5.3 Use of these procedures assume:  
5.3.1 The glass is free of edge damage and is properly glazed,  
5.3.2 The glass has not been subjected to abuse,  
5.3.3 The surface condition of the glass is typical of glass that has been in service for several years and is significantly weaker than freshly manufactured glass due to minor abrasions on exposed surfaces,  
5.3.4 The glass edge support system is sufficiently stiff to limit the lateral deflections of the supported glass edges to less than 1/175 of their lengths. The specified design load shall be used for this calculation, and  
5.3.5 The center of glass deflection shall not result in loss of edge support. Typically maintaining center of glass deflection at or below the magnitude of three times the nominal glass thickness assures that no loss of edge support will occur.  
5.4 Many other factors affect the selection of glass type and thickness. These factors include but are not limited to: thermal stresses, the effects of win...
SCOPE
1.1 This practice covers the determination of the thickness of glass installed in airport traffic control towers (ATCT) to resist a specified design loading with a selected probability of breakage less than or equal to either 1 lite per 1000 or 4 lites per 1000 at the first occurrence of the design wind loading.  
1.2 The procedures apply to common outward sloping cab glass designs for which the specified loads do not exceed 15 kPa (313 psf).  
1.3 The procedures assume control tower cab glass has an aspect ratio no greater than 3.  
1.4 The procedures assume control tower cab glass has an area no less than 1.86 m2 (20 ft2).  
1.5 The use of the procedures assumes the following:  
1.5.1 Monolithic and laminated glass installed in ATCTs shall have continuous lateral support along two parallel edges, along any three edges, or along all four edges;  
1.5.2 Insulating glass shall have continuous lateral support along all four edges; and  
1.5.3 Supported glass edges are simply supported and free to slip in plane.  
1.6 The procedures do not apply to any form of wired, patterned, etched, sandblasted, or glass types with surface treatments that reduce the glass strength.  
1.7 The procedures do not apply to drilled, notched, or grooved glass.  
1.8 The procedures address the determination of thickness and construction type to resist a specified design wind load at a selected probability of breakage. The final glass thickness and construction determined also depends upon a variety of other factors (see 5.4).  
1.9 These procedures do not address blast loading on glass.  
1.10 These procedures do not apply to triple-glazed insulating glass units.  
1.11 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.  
1.12 This standard does not purport to address all of the safety concerns, if any, assoc...

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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.  
5.2 Although this test method prescribes one environmental condition, other environmental conditions and exposure cycles can be employed for specific project evaluation. Such deviations should be described when reporting the data.
SCOPE
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.”  
1.2 The characterization of the IG secondary sealant properties, as defined by this test method, are strongly dependent on glass and edge spacer cleaning procedures, IG spacer profile, location of spacer, and primary IG sealant application. Users of this test method must recognize that the IG edge seal assembly influences the secondary sealant properties.  
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.  
1.4 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.  
1.5 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 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.

  • Standard
    6 pages
    English language
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  • Standard
    6 pages
    English language
    sale 15% off