ASTM C542-05(2011)
(Specification)Standard Specification for Lock-Strip Gaskets
Standard Specification for Lock-Strip Gaskets
ABSTRACT
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. Gaskets shall be manufactured from an ozone-resistant compound and shall not be dependent for ozone resistance on surface protection which can be removed by abrasion, detergents, or other means. The tensile strength test and elongation test shall be performed to meet the requirements prescribed. Tear resistance test, hardness test, compression test, brittleness temperature test, ozone resistance test, heat aging effect test, flame propagation test, and lip pressure test shall be performed to meet the requirements prescribed.
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 1—The 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 2—Structural 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 SI units are to be regarded as the standard.
1.4 Test Method C1166, 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.
1.5 The following precautionary caveat pertains only to the test method portion, Section 7, 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.
1.6 The committee with jurisdiction over this standard is not aware of any comparable standards published by other organizations.
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Designation:C542 −05 (Reapproved 2011)
Standard Specification for
Lock-Strip Gaskets
This standard is issued under the fixed designation C542; 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.
This standard has been approved for use by agencies of the U.S. 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, C1166 Test Method for Flame Propagation of Dense and
flame, oxidation, permanent deformation under load, and Cellular Elastomeric Gaskets and Accessories
diminution of gripping pressure are prime essentials. D15 Method of Compound and Sample Preparation for
Physical Testing of Rubber Products (Withdrawn 1975)
NOTE 1—The requirement of flame propagation may be waived by the
D395 Test Methods for Rubber Property—Compression Set
architect or professional engineer when doing so does not conflict with
D412 Test Methods forVulcanized Rubber andThermoplas-
local codes or ordinances.
tic Elastomers—Tension
1.2 This specification applies only to the “locking” com-
D573 Test Method for Rubber—Deterioration in an Air
pression type of gasket, sometimes referred to as the “zipper”
Oven
type.
D624 Test Method for Tear Strength of Conventional Vul-
NOTE 2—Structural integrity and weather-tightness of the wall requires
canized Rubber and Thermoplastic Elastomers
the sound design and installation of the entire system of which the gasket
D746 Test Method for Brittleness Temperature of Plastics
is only one component.
and Elastomers by Impact
1.3 The values stated in SI units are to be regarded as the
D1149 Test Methods for Rubber Deterioration—Cracking in
standard.
an Ozone Controlled Environment
1.4 Test Method C1166, as referenced in this specification,
D2240 Test Method for Rubber Property—Durometer Hard-
should be used to measure and describe the properties of
ness
materials, products, or assemblies in response to heat and
2.2 Other Standard:
flame under controlled laboratory conditions and should not be
Rubber Handbook, Specifications for Rubber Products
used to describe or appraise the fire hazard or fire risk of
materials, products, or assemblies under actual fire conditions.
3. Materials and Manufacture
However, results of this test may be used as elements of a fire
3.1 All materials and workmanship shall be in accordance
risk assessment which takes into account all of the factors
which are pertinent to an assessment of the fire hazard of a with good commercial practice.
particular end use.
3.2 Gaskets shall be manufactured from an ozone-resistant
1.5 The following precautionary caveat pertains only to the
compound and shall not be dependent for ozone resistance on
test method portion, Section 7, of this specification: This
surface protection which can be removed by abrasion,
standard does not purport to address the safety concerns, if
detergents, or other means.
any, associated with its use. It is the responsibility of the user
3.3 Gaskets shall be free of porosity, surface defects, and
of this standard to establish appropriate safety and health
dimensional irregularities, particularly in the sealing area.
practices and determine the applicability of regulatory limita-
tions prior to use. 3.4 Unless otherwise specified, the material shall be black.
1.6 Thecommitteewithjurisdictionoverthisstandardisnot
aware of any comparable standards published by other orga-
nizations.
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. The last approved version of this historical standard is referenced on
Current edition approved June 1, 2011. Published August 2011. Originally www.astm.org.
approved in 1965. Last previous edition approved in 2005 as C542 – 05. DOI: Available from Rubber Manufacturers Association, 444 Madison Ave., New
10.1520/C0542-05R11. York, NY.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C542−05 (2011)
TABLE 2 Cross-Sectional Tolerances Lock-Strip Gaskets
3.5 Lubricantsusedininstallation,shallbeasrecommended
A
RMA Class 2, Schedule I, Commercial
by the gasket manufacturer.
Dimension, Tolerance,
mm (in.) plus or minus
4. Physical Properties
Over 0 to 2.54 (0 to 0.10) incl. 0.32 (0.013)
Over 2.54 to 4.06 (0.10 to 0.16) incl. 0.40 (0.016)
4.1 The physical properties of the gasket shall conform to
Over 4.06 to 6.35 (0.16 to 0.25) incl. 0.50 (0.020)
the requirements specified in Table 1.
Over 6.35 to 10.16 (0.25 to 0.40) incl. 0.63 (0.025)
Over 10.16 to 16.0 (0.40 to 0.63) incl. 0.80 (0.032)
Over 16.0 to 25.4 (0.63 to 1.00) incl. 1.00 (0.040)
5. Dimensions and Permissible Variations
Over 25.4 to40.64 (1.00 to 1.60) incl. 1.25 (0.050)
5.1 Minimum thickness of material between the locking Over 40.64 to 63.5 (1.60 to 2.50) incl. 1.60 (0.063)
A
strip cavity and the panel or rail channel shall be 2.5 mm (0.10 Rubber Handbook, Specifications for Rubber Products, Table 12.
in.).
5.2 All cross-sectioned dimensions shall have an RMA
7.3 Hardness—TestinaccordancewithTestMethodD2240,
Class 2 tolerance, as specified in Table 2 unless otherwise
using a Type A durometer. If size or shape of the specimen
agreed by the purchaser and seller.
precludes testing of the finished surface, make measurements
on a squarely cut end or on a flat sliced or buffed surface.
6. Sampling
Determine change in hardness after oven aging for 70 h at 100
6.1 When proof of conformance with this specification is
6 1°C (212 6 2°F).
required, the samples shall be taken from the finished product
7.4 Compression Set—Test in accordance with Test Meth-
whenever possible.
ods D395, Method B. Hold the sample under test for 22 h at
6.2 When the thickness or shape of the finished product
100 6 1°C (212 6 2°F). Buffed specimen, taken from material
makes sampling, as specified in Section 6, impossible, the
1.5 mm ( ⁄16 in.) minimum thickness may be superimposed to
manufacturershall,uponrequestofthepurchaseratthetimeof
a total thickness of 13.0 mm ( ⁄2 in.).
ordering, furnish a sufficient number of test slabs or blocks
7.5 Brittleness Temperature—Test in accordance with Test
prepared in accordance with Methods D15 for the proper
Method D746.
performance of the required tests. The slabs or blocks shall be
prepared from the compound of the same source production lot 7.6 OzoneResistance—TestinaccordancewithTestMethod
used in the gasket. D1149 (SpecimenA). Use an ozone concentration of 100 mPa,
an exposure time of 40 6 2°C (104 6 3.6°F), and a specimen
7. Test Methods elongation of 20 %.
7.1 Tensile Strength and Elongation—Test in accordance 7.7 HeatAging—Testtheeffectsofheataginginaccordance
with Test Methods D412. Determine percentage change in with Test Method D573.
tensile strength and elongation after oven aging for 70 h at 100
7.8 Flame Propagation—Test Method C1166.
6 1°C (212 6 2°F).
7.8.1 This test is designed to differentiate the flame propa
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