ISO 28278-1:2011
(Main)Glass in building — Glass products for structural sealant glazing — Part 1: Supported and unsupported monolithic and multiple glazing
Glass in building — Glass products for structural sealant glazing — Part 1: Supported and unsupported monolithic and multiple glazing
ISO 28278-1:2011 specifies requirements for the suitability of supported and unsupported glass products for use in the structural sealant glazing (SSG) technique. Regarding glass products, ISO 28278-1:2011 constitutes a supplement to the requirements specified in the corresponding international standards with regard to verifying suitability for use in SSG systems. Only soda lime silicate glass is taken into consideration in ISO 28278-1:2011. The glass products are installed and bonded into the support under controlled environmental conditions as described in ISO 28278-2. Plastic glazing is excluded from the scope of ISO 28278-1:2011. The structural weatherproofing and sealant and outer seal of IGU products, which are commonly used in structural glazing applications are those based on organo-siloxane,"silicone" polymers, and recommended for use by the sealant manufacturer. Where there is a risk of earthquakes, the sealant design may not be sufficient to resist the loads, and complementary arrangements may be necessary. ISO 28278-1:2011 does not preclude the use of other sealant types where these can demonstrate suitability for service according to ISO 28278-1:2011 and when used following the recommendations of the sealant manufacturer.
Verre dans la construction — Produits verriers pour vitrage extérieur collé — Partie 1: Vitrages monolithiques ou multiples, supportés ou non supportés
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 28278-1
First edition
2011-12-01
Glass in building — Glass products for
structural sealant glazing —
Part 1:
Supported and unsupported monolithic
and multiple glazing
Verre dans la construction — Produits verriers pour vitrage extérieur
collé —
Partie 1: Vitrages monolithiques ou multiples, supportés ou non
supportés
Reference number
©
ISO 2011
© ISO 2011
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ii © ISO 2011 – All rights reserved
Contents Page
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 6
5 Principle . 8
6 Required characteristics of glass products . 10
6.1 Appropriate glass products . 10
6.2 Dimensional tolerances . 11
6.3 Glass shapes . 12
6.4 Corners, notches and holes . 12
7 Verification of the suitability of glass products for use in SSG systems when exposed to
ultra-violet (UV) radiation. 13
7.1 General . 13
7.2 Insulating glass unit (IGU) . 13
7.3 Laminated glass or monolithic glass — Situation 3 (see Figure 3) . 15
7.4 Assessment of the adhesion between the sealant and the glass . 15
8 Design . 16
8.1 Calculation of the thickness of the glass . 16
8.2 Calculation of the height of the outer sealant of the IGU for supported and unsupported
glazing . 16
8.3 Calculation of the height of the outer sealant of the IGU for unsupported glazing . 20
Annex A (informative) Assembly requirement . 21
Annex B (normative) Structural and/or ultra-violet (UV) -resistant sealant (for use with structural
sealant glazing and/or IGUs with exposed seals) . 26
Annex C (normative) Evaluation of tests results . 42
Annex D (normative) Shear at 23 °C — Test method . 46
Annex E (normative) Factory production control (FPC) requirements for sealants . 48
Annex F (normative) Outer seal of an IGU — Category differentiation . 53
Annex G (normative) Formation of bubbles . 56
Annex H (informative) Sealing, structural bonding and UV resistance schematic illustrations . 57
Annex I (normative) Initial testing of the bonding of sealant to a non-glass substrate . 60
Bibliography . 62
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 28728-1 was prepared by Technical Committee ISO/TC 160, Glass in building, Subcommittee SC 2, Use
considerations.
ISO 28728 consists of the following parts, under the general title Glass in building — Glass products for
structural sealant glazing:
Part 1: Supported and unsupported monolithic and multiple glazing
Part 2: Assembly rules
iv © ISO 2011 – All rights reserved
INTERNATIONAL STANDARD ISO 28278-1:2011(E)
Glass in building — Glass products for structural sealant
glazing —
Part 1:
Supported and unsupported monolithic and multiple glazing
1 Scope
This part of ISO 28278 specifies requirements for the suitability of supported and unsupported glass products
(see Figure 1) for use in the structural sealant glazing (SSG) technique. Regarding glass products, this part of
ISO 28278 constitutes a supplement to the requirements specified in the corresponding ISO standards with
regard to verifying suitability for use in SSG systems.
Only soda lime silicate glass is taken into consideration in this part of ISO 28278.
The glass products are installed and bonded into the support under controlled environmental conditions, as
described in ISO 28278-2.
Plastic glazing is excluded from the scope of this part of ISO 28278.
The structural, weatherproofing and sealant and outer seal of insulating glass unit (IGU) products, which are
commonly used in structural glazing applications, are those based on organo-siloxane, “silicone” polymers,
and recommended for use by the sealant manufacturer. Where there is a risk of earthquake, the sealant
design may not be sufficient to resist the loads, and complementary arrangements may be necessary.
This part of ISO 28278 does not preclude the use of other sealant types where these can demonstrate
suitability for service according to this part of ISO 28278 and when used following the recommendations of the
sealant manufacturer.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 527-3:1995, Plastics — Determination of tensile properties — Part 3: Test conditions for films and sheets
ISO 868:2003, Plastics and ebonite — Determination of indentation hardness by means of a durometer
(Shore hardness)
ISO 1183-1:2004, Plastics — Methods for determining the density of non-cellular plastics — Part 1: Immersion
method, liquid pyknometer method and titration method
ISO 3231:1993, Paints and varnishes — Determination of resistance to humid atmospheres containing sulfur
dioxide
ISO 7389, Building construction — Jointing products — Determination of elastic recovery of sealants
ISO 9227:2006, Corrosion tests in artificial atmospheres — Salt spray tests
ISO 10563:2005, Building construction — Sealants — Determination of change in mass and volume
ISO 11358-2, Plastics — Thermogravimetry (TG) of polymers — Part 2: Determination of activation energy
ISO 11600, Building construction — Jointing products — Classification and requirements for sealants
ISO 12543 (all parts), Glass in building — Laminated glass and laminated safety glass
ISO 16269-6, Statistical interpretation of data — Part 6: Determination of statistical tolerance intervals
ISO 20492 (all parts), Glass in buildings — Insulating glass
ISO 28278-2:2010, Glass in building — Glass products for structural sealant glazing — Part 2: Assembly rules
ASTM C 1184:2000, Standard Specification for Structural Silicone Sealants
ASTM C 1265:2005, Standard Test Method for Determining the Tensile Properties of an Insulating Glass
Edge Seal for Structural Glazing Applications
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE Figure 1 is included only as an aid to explaining the terminology used in this International Standard. The
components indicated in broken and dotted lines are covered by other technical specifications such as ETAG 002 or
standards concerned with curtain wall façades.
3.1
structural sealant glazing
SSG
assembly in which glass products are fixed to the structural seal frame by means of a sealant that has been
shown to be capable of withstanding the load actions applied to the glass products of the structural seal frame
3.2
anchorage
anchorage of the structural seal support frame on the framework
NOTE See (1) in Figure 1.
3.3
backer rod
pre-formed continuous strip that limits the section and height of a fillet of weather sealant
NOTE See (2) in Figure 1.
3.4
hermetic seal bite
dimension of the second barrier of the hermetic seal measured parallel to the glass unit at the panel level
NOTE See (3) in Figure 1.
3.5
façade framework
members to which the structural seal support frame is connected and which transmit the loads to the building
NOTE See (4) in Figure 1.
2 © ISO 2011 – All rights reserved
Key
1 anchorage 8 self-weight mechanical support
2 backer rod 9 weather seal
3 height of the outer seal 10 setting blocks
4 façade framework 11 adhesive spacer
5 finishing material 12 structural seal
6 hermetic seal 13 structural seal adhesion surface
6a (inner seal) 14 structural seal support frame
6b (outer seal) 15 anti-adhesive film
6c outer seal adhesion surface 16 retaining device
7 glass unit
Figure 1 — Terminology
3.6
finishing material
elastomeric sealant extruded into the joint, of sufficient cross-section as to constitute a barrier to air and water
when cured, or a pre-extruded gasket with a fin of sufficient cross-section
NOTE See (5) in Figure 1 and (4) in Figure 3.
3.7
outer seal
sealant intended to ensure a hermetic seal, providing a barrier to water and vapour penetration, and light,
around the edge of an insulating unit whilst remaining compliant with displacements caused by wind or other
loads
NOTE 1 The hermetic seal is called “structural” (see 3.14) when it also has the supplementary function of adequately
transmitting to the seal support frame the forces applied to the glass.
NOTE 2 See (6b) in Figure 1 and (3) in Figure 3.
3.8
glass unit
element consisting of a single glass pane (monolithic or laminated) or an insulating glass unit (IGU) specified
for use in SSG
NOTE 1 The IGU may be one of two types: a unit with aligned edges for which the two panes have the same nominal
dimensions, or a unit with stepped edges for which the two panes have different dimensions.
NOTE 2 See Figure 2 and (7) in Figure 1.
3.9
insulating glass unit
IGU
pre-assembled unit comprising panes of glass that are sealed at the edges and separated by dehydrated
space(s), intended for use in buildings
3.10
self-weight mechanical support
element situated beneath the bottom edge of the glass unit that transmits the weight of the latter to the
structural seal support frame
NOTE See (8) in Figure 1.
3.11
weather seal
fillet of sealant or weather fin of adequate cross-section constituting a barrier to air and water
NOTE See (9) in Figure 1.
3.12
setting blocks
bearing elements situated between the self-weight mechanical support and the bottom edge of a glass unit
used to position the glass unit in the structural seal support frame and to avoid a permanent shear load
NOTE See (10) in Figure 1.
3.13
adhesive spacer
continuous pre-formed strip defining the cross-section of the fillet of
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