ASTM C542-94(2005)
(Specification)Standard Specification for Lock-Strip Gaskets
Standard Specification for Lock-Strip Gaskets
SCOPE
1.1 This specification defines the required properties of lock-strip gaskets where resistance to sunlight, weathering, flame, oxidation, permanent deformation under load, and diminution of gripping pressure are prime essentials. Note 1The requirement of flame propagation may be waived by the architect or professional engineer when doing so does not conflict with local codes or ordinances.
1.2 This specification applies only to the "locking" compression type of gasket, sometimes referred to as the "zipper" type. Note 2Structural integrity and weather-tightness of the wall requires the sound design and installation of the entire system of which the gasket is only one component.
1.3 The values stated in inch-pound units are to be regarded as the standard.
1.4 Test Method C 1166, as referenced in this specification, should be used to measure and describe the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions and should not be used to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions. However, results of this test may be used as elements of a fire risk assessment which takes into account all of the factors which are pertinent to an assessment of the fire hazard of a particular end use
The following precautionary caveat pertains only to the test method portion, Section , of this specification: This standard does not purport to address the safety concerns, 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.
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Designation: C 542 – 94 (Reapproved 2005)
Standard Specification for
Lock-Strip Gaskets
This standard is issued under the fixed designation C 542; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 2. Referenced Documents
1.1 This specification defines the required properties of 2.1 ASTM Standards:
lock-strip gaskets where resistance to sunlight, weathering, C 717 Terminology of Building Seals and Sealants
flame, oxidation, permanent deformation under load, and C 1166 Test Method for Flame Propagation of Dense and
diminution of gripping pressure are prime essentials. Cellular Elastomeric Gaskets and Accessories
D15 Methods of Compound and Sample Preparation for
NOTE 1—The requirement of flame propagation may be waived by the
Physical Testing of Rubber Products
architect or professional engineer when doing so does not conflict with
D 395 Test Methods for Rubber Property—Compression
local codes or ordinances.
Set
1.2 This specification applies only to the “locking” com-
D 412 Test Methods for Vulcanized Rubber and Thermo-
pression type of gasket, sometimes referred to as the “zipper”
plastic Rubbers and Thermoplastic Elastomers—Tension
type.
D 573 Test Method for Rubber—Deterioration in an Air
NOTE 2—Structural integrity and weather-tightness of the wall requires
Oven
the sound design and installation of the entire system of which the gasket
D 624 Test Method for Tear Strength of Conventional
is only one component.
Vulcanized Rubber and Thermoplastic Elastomers
1.3 The values stated in inch-pound units are to be regarded D 746 Test Method for Brittleness Temperature of Plastics
as the standard.
and Elastomers by Impact
1.4 Test Method C 1166, as referenced in this specification, D 1149 Test Method for Rubber Deterioration—Surface
should be used to measure and describe the properties of
Ozone Cracking in a Chamber
materials, products, or assemblies in response to heat and
D 1566 Terminology Relating to Rubber
flame under controlled laboratory conditions and should not be D 2240 Test Method for Rubber Property—Durometer
used to describe or appraise the fire hazard or fire risk of
Hardness
materials, products, or assemblies under actual fire conditions. 2.2 Other Standard:
However, results of this test may be used as elements of a fire
Rubber Handbook, Specifications for Rubber Products
risk assessment which takes into account all of the factors
3. Terminology
which are pertinent to an assessment of the fire hazard of a
particular end use. 3.1 Definitions:
1.5 The following precautionary caveat pertains only to the 3.1.1 For the definition of the term elastomer, and other
test method portion, Section 8, of this specification: This definitions of terms used in this specification, see Terminology
standard does not purport to address the safety concerns, if C 717.
any, associated with its use. It is the responsibility of the user 3.1.2 hardness—the resistance to indentation (Terminology
of this standard to establish appropriate safety and health D 1566).
practices and determine the applicability of regulatory limita- 3.2 Definitions of Terms Specific to This Standard:
tions prior to use.
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
This specification is under the jurisdiction of ASTM Committee C24 on Standards volume information, refer to the standard’s Document Summary page on
Building Seals and Sealants and is the direct responsibility of Subcommittee C24.73 the ASTM website.
on Compression Seal and Lock-Strip Gaskets. Discontinued; see 1975 Annual Book of ASTM Standards, Part 37. Replaced by
Current edition approved Feb. 1, 2005. Published March 2005. Originally Practice D 3182, Test Methods D 3190, and Test Methods D 3192.
approved in 1965 as C 542 – 65 T. Last previous edition approved in 1999 as Available from Rubber Manufacturers Association, 444 Madison Ave., New
C 542 – 94(1999). York, NY.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
C 542 – 94 (2005)
3.2.1 bite—the width by which the flanges of a lock-strip 3.2.14 ladder gasket—a lock-strip gasket in the form of a
gasket overlap the edges of supported or supporting material. subdivided frame having one or more integrally formed inter-
3.2.2 clamping pressure—the pressure exerted by the lip of mediate cross members.
the lock-strip gasket on material installed in the channel, when 3.2.15 lip—the inner face of the tip of a flange on a
the lock-strip is in place. lock-strip gasket (see Fig. 1 and Fig. 2).
3.2.3 durometer—(1) an instrument for measuring the hard- 3.2.16 lip pressure—the pressure exerted by the lip of a
ness of rubber-like materials. (2) a term used to identify the lock-strip gasket on material installed in the channel, when the
relative hardness of rubber-like materials, for example “low lock-strip is in place.
durometer” (relatively soft) or “high durometer” (relatively 3.2.17 lip seal pressure—the lip pressure required to effect
hard). a seal against the passage of water and air.
3.2.4 edge clearance—the distance between the bottom of a 3.2.18 lock-strip or locking strip—the strip which is de-
channel of a lock-strip gasket and the edge of material installed signed to be inserted in the lock-strip cavity to force the lips
in the channel. against material placed in the channel.
3.2.5 elongation—increase in length (expressed as a per- 3.2.19 lock-strip cavity—the groove in the face of a lock-
centage of the original length). strip gasket, designed to receive and retain the lock-strip.
3.2.6 filler strip—see lock-strip, the preferred term. 3.2.20 reglet—agrooveorrecessformedinmaterialsuchas
3.2.7 flange—that part of a lock-strip gasket which extends concrete or masonry to receive the spline, or tongue, of a
to form one side of a channel (see Fig. 1 and Fig. 2). reglet-type lock-strip gasket.
3.2.8 gasket—any preformed deformable device designed 3.2.21 reglet gasket—see gasket, lock-strip, reglet type.
tobeplacedbetweentwoadjoiningpartstopreventthepassage 3.2.22 setting block—a short length of suitable material
of liquid or gas between the parts. placedinthegasketchanneltomaintainproperedgeclearance.
3.2.9 gasket, lock-strip—a gasket in which the sealing 3.2.23 spline or tongue—that part of a reglet-type lock-strip
pressure is produced internally by forcing a keyed lock-strip gasket which is designed to be installed in a reglet in
into a groove (referred to as the lock-strip cavity) in one face supporting material.
of the gasket. 3.2.24 web—that part of an H-type lock-strip gasket which
3.2.9.1 H-type—two channel recesses, of equal or unequal extends between the flanges, forming two channels.
sizes, one on either side of a central web (see Fig. 1).
4. Materials and Manufacture
3.2.9.2 reglet-type—a channel recess on the inner edge and
a tongue, or spline, on the outer edge, the latter being designed 4.1 All materials and workmanship shall be in accordance
for insertion in a reglet (see Fig. 2). with good commercial practice.
4.2 Gaskets shall be manufactured from an ozone-resistant
3.2.10 gasket, structural—see gasket, lock-strip, the pre-
ferred term. compound and shall not be dependent for ozone resistance on
surface protection which can be removed by abrasion, deter-
3.2.11 gasket, zipper—see gasket, lock-strip, the preferred
term. gents, or other means.
3.2.12 H-gasket—see gasket, lock-strip, H-type. 4.3 Gaskets shall be free of porosity, surface defects, and
3.2.13 hinge—the minimum thickness of gasket material dimensional irregularities, particularly in the sealing area.
between the channel recess and the lock-strip cavity; the plane 4.4 Unless otherwise specified, the material shall be black.
at which bonding occurs when the flange is bent open to 4.5 Lubricantsusedininstallation,shallbeasrecommended
receive or release installed material. by the gasket manufacturer.
A Hinge H Glass or panel
B Lock-strip I Bite
C Lock-strip cavity J Edge clearance
D Lip (sealing edge) K Frame to glass or panel dimension
E Channel recess L Frame lug
F Flange M Frame
GWeb
FIG. 1 Basic H-Type Gasket, Its Functional Principles and Nomenclature
C 542 – 94 (2005)
A Hinge H Glass or panel
B Lock-strip I Bite
C Lock-strip cavity J Edge clearance
D Lip (sealing edge) K Frame to glass or panel dimension
E Channel recess L Spline
F Flange M Reglet
GWeb
FIG. 2 Reglet Type Gasket, Its Functional Principles and Nomenclature
5. Physical Properties 7.2 When the thickness or shape of the finished product
makes sampling, as specified in Section 7, impossible, the
5.1 The physical properties of the gasket shall conform to
manufacturershall,uponrequestofthepurchaseratthetimeof
the requirements specified in Table 1.
ordering, furnish a sufficient number of test slabs or blocks
prepared in accordance with Methods D15 for the proper
6. Dimensions and Permissible Variations
performance of the required tests. The slabs or blocks shall be
6.1 Minimum thickness of material between the locking
prepared from the compound of the same source production lot
strip cavity and the panel or rail channel shall be 0.10 in. (2.5
used in the gasket.
mm).
6.2 All cross-sectioned dimensions shall have an RMA
8. Test Methods
Clas
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