ASTM C1294-95

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Designation: C 1294 – 95
Standard Test Method for
Compatibility of Insulating Glass Edge Sealants with Liquid-
Applied Glazing Materials
This standard is issued under the fixed designation C 1294; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4.3 Compatibility is determined by comparing the measured
and observed properties of the test specimens to the control
1.1 This test method covers a laboratory procedure for
samples.
quantitatively measuring the compatibility of liquid-applied
glazing materials with an insulating glass unit edge sealant.
5. Significance and Use
Compatibility is determined by measuring the changes in the
5.1 Liquid-applied glazing materials, bedding sealants,
insulating glass edge sealant adhesive and cohesive properties.
glazing compounds (that is, glazing sealants) are designed to
Hereinafter insulating glass is referred to as IG.
provide a seal between the IG unit and the window or wall
1.2 This test method does not address the issue of the
framing. Frequently there is physical contact between these
integrity of the hermetic seal or changes to the vision area in an
materials and an IG unit edge sealant. Depending on the
IG unit. Such factors as possible unit fogging or primary
particular IG unit edge sealant, there can be a detrimental
sealant reaction in a dual-seal system due to volatile compo-
physical or chemical interaction between it and the liquid-
nents permeating the IG sealant are not considered in this test
applied glazing material. Detrimental effects may include:
method.
weakening, softening, hardening, or adhesive failure of the IG
1.3 This standard does not purport to address all of the
edge sealant, or visual obstruction inside the IG unit.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
6. Apparatus and Accessory Materials
priate safety and health practices and determine the applica-
6.1 Oven, forced draft, capable of maintaining a constant
bility of regulatory limitations prior to use.
temperature of 70 6 3°C (158 6 5°F).
6.2 Tensile Testing Machine, capable of producing a tensile
2. Referenced Documents
load on the specimen at the rate of 5 6 0.51 mm (0.2 6 0.02
2.1 ASTM Standards:
2 in.) per minute.
C 717 Terminology of Building Seals and Sealants
6.2.1 Fixed Member—A fixed or essentially stationary
3. Terminology member carrying one grip.
6.2.2 Moveable Member—A moveable member carrying a
3.1 Definitions—Refer to Terminology C 717 for definitions
second grip.
of the following terms: adhesive failure, cohesive failure,
6.2.3 Grips—The grips should be suitable to firmly grasp
compatibility, compound, elongation, glazing, seal, sealant,
the test fixture that holds the test specimen and should be
substrate.
designed to eliminate eccentric specimen loading. Specimen
4. Summary of Test Method
loading should be parallel to the centerline of the short axis of
the sealant. A swivel or universal joint near each end of the
4.1 This test method includes the measurement of tensile
specimen should be provided for alignment purposes.
force, elongation, and percent cohesive or adhesive failure and
6.2.4 Grip Fixture—A fixture capable of being held by the
observations of the specimen’s general physical appearance
grips and furnishing a tensile force to and maintaining proper
and observation of elongation.
alignment with the test specimen.
4.2 Test specimens are exposed to 70°C (158°F) heat for
6.3 Spatulas, for use in mixing and applying sealant.
four weeks while contacting the liquid-applied glazing material
6.4 Paper Cup or Can, for use in mixing multicomponent
being evaluated.
sealants when applicable.
4.2.1 Control specimens are exposed only to the 70°C
6.5 Plastic Cartridge, (Semco), to extrude sealant when
(158°F) heat.
applicable.
6.6 Triple-Beam or Electronic Balance, accurate to 60.01 g
This test method is under the jurisdiction of ASTM Committee C-24 on
−4
(3.5 by 10 oz) for weighing multicomponent sealant mixes
Building Seals and Sealants and is the direct responsibility of Subcommittee C24.32
and finished test specimens.
on Chemically Curing Sealants.
Current edition approved April 15, 1995. Published August 1995.
6.7 Glass Substrates, clear float glass, 6 by 25 by 75 mm
Annual Book of ASTM Standards, Vol 04.07.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
C 1294
(0.25 by 1 by 3 in.). A total of ten substrates is required for each 7.6 Measure the width and length of the sealant contact area
glazing material tested. in millimetres (inches) with the glass substrates for use in
6.8 Spacer, nominally 13 mm (0.50 in.) wide IG, aluminum calculating the tensile strength of the assembly per unit area.
spacer with preferably an anodized aluminum surface. Spacers
should be cut into 50-mm (2-in.) lengths. 8. Procedure
6.9 Test Fixture (Fig. 1) to hold the specimen components
8.1 Spread the liquid-applied glazing material onto the
in place while the IG sealant is applied and cured.
bottom of the aluminum or glass pan to a thickness of
6.10 Aluminum Foil, standard kitchen wrapping foil is
approximately 6 mm (0.25 in.).
suitable.
8.2 Press sealed edges of three of the IG edge specimens
6.11 Container, a shallow aluminum or glass pan or tray is
into the liquid-applied glazing material to a depth of approxi-
suitable. The container must be large enough to hold all the test
mately 1.6 mm (0.0625 in.).
specimens. A container is required for each combination of IG
8.3 Cover
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