ASTM C716 - 06 (2020)

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Designation: C716 −06 (Reapproved 2020)
Standard Speciﬁcation for
Installing Lock-Strip Gaskets and Inﬁll Glazing Materials
1
This standard is issued under the ﬁxed designation C716; 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 This speciﬁcation covers installation procedures for
lock-strip gaskets that comply with Speciﬁcation C542 and for
inﬁll glazing materials in lockstrip gasket glazing applications
used in building walls which are not more than 15° from a
vertical plane. The prime performance considerations are
weathertightness against air and water inﬁltration, and struc-
tural integrity under wind loads.
1.2 The values stated in SI units are to be regarded as
standard. The values given in parentheses are provided for
information only.
1.3 The committee with jurisdiction over this standard is not
aware of any comparable standards published by other orga-
nizations.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
2
C542 Speciﬁcation for Lock-Strip Gaskets
C717 Terminology of Building Seals and Sealants
C963 Speciﬁcation for Packaging, Identiﬁcation, Shipment,
and Storage of Lock-Strip Gaskets
C964 Guide for Lock-Strip Gasket Glazing
3. Signiﬁcance and Use
3.1 This speciﬁcation can be referred to in contract docu-
ments as a method and workmanship standard for the installa-
tion of lock-strip gasket glazing systems. See also related
standards (Speciﬁcations C542 and C963, Guide C964, and
Terminology C717).
4. Installation
4.1 Inspection of Components—Before installing gaskets,
the installer shall check the mounting frames to see that they
are within speciﬁed dimensional tolerances and not out-of-
square or plane, and check all gaskets for type, dimensions, and
defects such as misalignment at molded corners and damaged
lips. Installation shall not proceed until corrections have been
made.
4.2 Environmental Conditions—Maximum efficiency and
sealing capability of gaskets is achieved in a clean, dry, warm
environment, with the gasket kept resilient during the entire
installation process. During cold weather the use of temporary
enclosures around the units to be glazed or paneled will
facilitate temperature control and also aid in keeping open
gasket channels clean and dry.
4.3 Preparation and Conditioning of Gaskets—Lock-strip
gaskets require conditioning prior to installation in order to
restore maximum resiliency and remove deformations after
prolonged storage in a coiled or stressed position. Gaskets shall
be unpacked from their containers and conditioned for 24 h in
a temperature not lower than 21.1 °C (70 °F) by being placed
ﬂat or hung on racks to permit recovery of their original
shapes. Racks shall be free of rough surfaces, projections,
sharp edges, and other conditions that could damage the
gaskets. When the ambient temperature is 10 °C (50 °F) or
below and a heated space is not available, gaskets shall be
heated by other means to remove deformations and provide a
high degree of ﬂexibility and resiliency. This may be done by
warming them in hot water or heated containers. Gaskets shall
not be heated by being draped over heated units or placed in
direct contact with a ﬂame or ﬁred heating device. The
installation of glass, panel, and lock-strip shall be completed
while the gasket is still warm and pliable and with the gasket
channels clean and dry.
4.4 Use of Tools—To minimize the possibility of damage,
sharp or pointed tools or implements such as screwdrivers or
putty knives shall not be used on lock-strip gaskets. Suitable
1
This speciﬁcation is under the jurisdiction of ASTM Committee C24 on
Building Seals and Sealantsand is the direct responsibility of Subcommittee C24.73
on Compression Seal and Lock Strip Gaskets.
Current edition approved Jan. 1, 2020. Published January 2020. Originally
approved in 1973. Last previous edition approved in 2015 as C716 – 06 (2015).
DOI: 10.1520/C0716-06R20.
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
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
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.

gasket installation tools, such as nonmetallic spatulas and

engineered lock-strip insertion devices, are available from the

gasket manufacturer.

4.5 Use of Lubricants—If necessary a lubricant may be

applied to the contact surfaces of the gasket to ease the

installation and help prevent damage to the gasket, glass, or

panel. The lubricant shall be nonstaining, nontoxic,

noncorrosive, chemically stable, compatible with all contact

components, easily removable from exposed surfaces by dry

wiping or with water, and acceptable to the manufacturer of the

supporting frame, panel, and gasket.

4.6 Use of Supplementary Wet Sealants—The use of supple-

mentary wet sealants in conjunction with lock-strip gasket

installations is only required under certain conditions. Such a

condition would occur when the outer lip of the gasket extends

over a butt joint in the supporting frame. The void formed

between the gasket and frame shall be sealed at the time of

installation with a wet sealant. However, the sealant may be

omitted if the system is designed to drain any water that enters

to the exterior, and the omission of a wet sealant is agreeable

to the purchaser and seller. Another condition would be at ﬁeld

butt joints in gaskets. Such joints require the use of a sealant

installed in, rather than on top of, the joint at the time of the

gasket installation. The wet sealant used, as well as the sealant

manufacturer’s requirements for cleaning and priming the

surfaces to be sealed, shall be compatible with the components

in contact with it and acceptable to the manufacturers of the

components. The use of wet sealants to remedy a defective or

damaged gasket or improperly fabricated supporting frame

shall not be permitted, unless agreeable to the purchaser and

seller.

4.7 Installation of Single-Opening Gasket Systems:

4.7.1 H-Type Gasket—Install the upper gasket corners ﬁrst,

and then install the lower gasket corners onto the supporting

frame. To avoid slippage, engage both horizontal and vertical

members for about 304.8 mm (1 ft) in both directions from the

corners, and work the gasket until the web is snug against head

and jambs and the corners are square. Then work the remainder

of the gasket onto the supporting frame by starting from each

corner and working towards the center of each side, making

sure the gasket web is ﬁrmly seated against the frame and that

the sealing lips are not curled under, particularly at the corners.

Pull each corner of outer ﬂange about 6.4 mm (

⁄

in.) away

from the supporting frame with thumb or nonmetallic spatula

and then release to ensure uncurling any corner lips hidden

from view.

4.7.2 Reglet-Type Gasket—Insert the upper gasket corners

ﬁrst, and then install the lower gasket corners into the groove

or reglet of the supporting frame, seating them ﬁrmly with a

resiliently faced hammer and a wooden or metal block having

smooth, rounded edges and corners. Then, on each side, insert

the gasket into the groove at the center of each side working

from the center to the corners and from the corners to the

center, equalizing the crowd over the length of each side until

the lips are ﬁrmly and continuously seated against the support-

ing frames.

4.8 Installation of Multiple-Opening Gasket Systems (See

Figs. 1 and 2):

4.8.1 Unsupported Vertical Ladder Assembly—Laterally un-

supported vertical ladder type installations as illustrated in Fig.

2, where the vertical load of a light of glass is transferred

through the gasket web to the light below, with lateral support

at the jambs, are not recommended. Refer to Guide C964 for a

discussion of the disadvantages of this type of system.

4.8.2 Unsupported Horizontal Ladder Assembly—Mark on

the head and sill frame members the exact location of the

center line of the vertical gasket muntin. Install the jamb

section ﬁrst, then work along the head and sill to the ﬁrst

muntin. Align each gasket muntin with the center lines marked

on the head and sill. Install the glass or panel. The installation

of setting blocks and edge spacers can be performed as

described in 4.10. Then insert the lock-strip at the sill and head,

running to within a few inches of the ﬁrst gasket muntin.

Continue the procedure by installing the next glass or panel.

Insert the lock-strip into the muntin ﬁrst and continue with the

insertion of the lock-strip at the head and sill members. Repeat

the procedure until all glass or panels are installed.

4.8.3 Supported Vertical Ladder Assembly—Align and se-

cure the gasket horizontal muntins to the corresponding sup-

porting structural members. The gasket muntins are held in line

by the structural supporting muntin members with the entire

ladder gasket unit completely supported during the installation

procedure.

4.8.4 Supported Horizontal Ladder Assembly—Mount the

gasket to the peripheral frame ﬁrst. Then align and secure the

vertical gasket muntins to the corresponding structural support-

ing members. Vertical spacer shims are not required between

the glass or panel edge and the gasket web.

4.8.5 Grid Assembly—A grid assembly is a combination of

the horizontal and vertical ladder assemblies. Supported grid

gaskets are mounted to the corresponding frame members

following the procedures noted under 4.8.3 and 4.8.4.

4.9 Installation of Stick System—A proprietary stick system

shall be installed in accordance with the curtain wall manufac-

turer’s instructions.

4.10 Installation of Glass or Panel into Gasket—Inspect,

clean, and dry the gasket as required and replace, if damaged,

before proceeding with the glazing or paneling operation. If

FIG. 1 Gasket Systems

C716 − 06 (2020)

necessary, a lubricant recommended by the gasket manufac-

turer can be used to aid insertion. Lubricate the surface of the

exterior ﬂange on the lock-strip side of the gasket channel that

is to receive the glass or panel. Beginning approximately 152.4

to 203.2 mm (6 to 8 in.) above the bottom, open the channel

lips and engage both lower corners of the glass or panel into the

gasket sides and then lower it carefully into the sill channel of

the gasket. Maintain the plane of the panel as close to the plane

of the opening as possible. Insert a nonmetallic spatula

between the edge of the glass or panel and the sealing lip on

each side, starting at the bottom of the opening. Proceed

upward with both spatulas at the same time, while simultane-

ously pushing the glass or panel lightly inward. Use care to

prevent cutting of gasket-sealing lips. When the glass or panel

is in jamb channels to within 50.8 to 76.2 mm (2 to 3 in.) of

uppercorners, begin at the center of the head and work outward

each way to engage the head channel. Then, using two spatulas,

lift gasket corners over the edge of the glass or panel. Center

the glass or panel in the gasket for uniform edge coverage on

both sides of the installation. At this time install properly sized

setting blocks, if required, by lifting the glass or panel and

placing them at the quarter points. Lower the glass or panel

onto the blocks, being careful not to displace them. Setting

blocks under panels are optional but are required for laminated,

insulating, annealed tinted, and reﬂective glass. The use of

setting blocks for other types of glass products shall be in

accordance with the glass manufacturer’s recommendations. If

necessary, edge spacers may be installed at this time to

maintain uniform edge clearance and to preclude lateral

displacement of the glass or panel.

4.11 Installation of Lock-Strip—As soon as the glass and

panels are in place, install the lock-strip so that the assembly is

secure and the gasket channel is sealed. Cut lock-strip for the

sill to a length approximately 50.8 to 76.2 mm (2 to 3 in.)

longer than the sill opening dimension. Lubricate the lock-strip

and lock-strip cavity. Thread the lock-strip into the eye of the

insertion tool. Start installation of the lock-strip at the sill,

trying to keep it under compression instead of tension and

leaving an excess of lock-strip at both ends. Repeat this

procedure for jambs and head. To avoid any later creep or

drawback of the lock-strip from the corners, trim the lock-strip

ends approximately 3.2 to 6.4 mm (

⁄

in.) longer than the

lock-strip cavity using garden pruning shears or diagonal

cutters, and crowd the lock-strip into place using a nonmetallic

tool. Either a mitre or square butt joint is acceptable. When

molded lock-strip corners are used, install them ﬁrst and form

butt joints with the lock-strip in compression between the

corners.

4.12 Completing the Installation—To straighten the

sightline, tap the gasket against the frame using a clean, smooth

block of wood. Push the lock-strip into the cavity with a

spatula wherever complete insertion was not accomplished.

Wipe off excess lubricant. Inspect and rectify any curled-under

lips. Contact of the gasket with the frame and panel or glass

shall be continuous and positive against smooth ﬂat surfaces.

5. Keywords

5.1 elastomer; gasket; glazing; installation; lock-strip; pre-

formed inﬁll; procedures

A Setting blocks

BWeb

C Spacer shims

D Laterally supporting muntin

E Vertical load transfer through setting blocks, web, and spacer shims to glass light below is not recommended

F Vertical load transfer through setting blocks and web to supporting muntin is recommended

G Laterally and vertically supporting muntin

FIG. 2 Vertical Ladder Assembly Horizontal Muntin

C716 − 06 (2020)

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摘要：

ASTM C716 - 06 (2020) 是美国材料与试验协会发布的一项关于金属反射型隔热毯的标准规范，该标准最初于2006年批准，并于2020年进行了确认和重新批准，适用于高温工业设备、管道及航空领域的隔热应用。该规范详细规定了金属箔与隔热材料复合毯的结构、尺寸公差、热性能、耐久性及安装要求，强调其在极端温度环境下的反射热辐射能力和抗机械应力性能。适用于需要高效隔热、防火及轻量化解决方案的工程场景，如发电厂、化工装置及航空航天系统。符合该标准的产品可确保长期使用中的热稳定性、耐腐蚀性及抗振动

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