ASTM C542-05(2017)

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.
Designation: C542 −05 (Reapproved 2017)
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 1.7 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.1 This specification defines the required properties of
ization established in the Decision on Principles for the
lock-strip gaskets where resistance to sunlight, weathering,
Development of International Standards, Guides and Recom-
flame, oxidation, permanent deformation under load, and
mendations issued by the World Trade Organization Technical
diminution of gripping pressure are prime essentials.
Barriers to Trade (TBT) Committee.
NOTE 1—The requirement of flame propagation may be waived by the
architect or professional engineer when doing so does not conflict with
2. Referenced Documents
local codes or ordinances.
2.1 ASTM Standards:
1.2 This specification applies only to the “locking” com-
C1166 Test Method for Flame Propagation of Dense and
pression type of gasket, sometimes referred to as the “zipper”
Cellular Elastomeric Gaskets and Accessories
type.
D15 Method of Compound and Sample Preparation for
NOTE 2—Structural integrity and weather-tightness of the wall requires
Physical Testing of Rubber Products (Withdrawn 1975)
the sound design and installation of the entire system of which the gasket
D395 Test Methods for Rubber Property—Compression Set
is only one component.
D412 Test Methods forVulcanized Rubber andThermoplas-
1.3 The values stated in SI units are to be regarded as the
tic Elastomers—Tension
standard.
D573 Test Method for Rubber—Deterioration in an Air
1.4 Test Method C1166, as referenced in this specification,
Oven
should be used to measure and describe the properties of D624 Test Method for Tear Strength of Conventional Vul-
materials, products, or assemblies in response to heat and
canized Rubber and Thermoplastic Elastomers
flameundercontrolledlaboratoryconditionsandshouldnotbe D746 Test Method for Brittleness Temperature of Plastics
used to describe or appraise the fire hazard or fire risk of
and Elastomers by Impact
materials, products, or assemblies under actual fire conditions. D1149 Test Methods for Rubber Deterioration—Cracking in
However, results of this test may be used as elements of a fire
an Ozone Controlled Environment
risk assessment which takes into account all of the factors D2240 Test Method for Rubber Property—Durometer Hard-
which are pertinent to an assessment of the fire hazard of a
ness
particular end use.
2.2 Other Standard:
1.5 The following precautionary caveat pertains only to the
Rubber Handbook, Specifications for Rubber Products
test method portion, Section 7, of this specification: This
standard does not purport to address the safety concerns, if 3. Materials and Manufacture
any, associated with its use. It is the responsibility of the user
3.1 All materials and workmanship shall be in accordance
of this standard to establish appropriate safety and health
with good commercial practice.
practices and determine the applicability of regulatory limita-
3.2 Gaskets shall be manufactured from an ozone-resistant
tions prior to use.
compound and shall not be dependent for ozone resistance on
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, 2017. Published June 2017. Originally www.astm.org.
approvedin1965.Lastpreviouseditionapprovedin2011asC542 – 05(2011).DOI: Available from Rubber Manufacturers Association, 444 Madison Ave., New
10.1520/C0542-05R17. York, NY.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C542 − 05 (2017)
TABLE 2 Cross-Sectional Tolerances Lock-Strip Gaskets
surface protection which can be removed by abrasion,
A
RMA Class 2, Schedule I, Commercial
detergents, or other means.
Dimension, Tolerance,
3.3 Gaskets shall be free of porosity, surface defects, and
mm (in.) plus or minus
dimensional irregularities, particularly in the sealing area.
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)
3.4 Unless otherwise specified, the material shall be black.
Over 4.06 to 6.35 (0.16 to 0.25) incl. 0.50 (0.020)
Over 6.35 to 10.16 (0.25 to 0.40) incl. 0.63 (0.025)
3.5 Lubricantsusedininstallation,shallbeasrecommended
Over 10.16 to 16.0 (0.40 to 0.63) incl. 0.80 (0.032)
by the gasket manufacturer.
Over 16.0 to 25.4 (0.63 to 1.00) incl. 1.00 (0.040)
Over 25.4 to40.64 (1.00 to 1.60) incl. 1.25 (0.050)
4. Physical Properties Over 40.64 to 63.5 (1.60 to 2.50) incl. 1.60 (0.063)
A
Rubber Handbook, Specifications for Rubber Products, Table 12.
4.1 The physical properties of the gasket shall conform to
the requirements specified in Table 1.
5. Dimensions and Permissible Variations
7.2 Tear Resistance—Test in accordance with Test Method
5.1 Minimum thickness of material between the locking
D624 using Die C.
strip cavity and the panel or rail channel shall be 2.5 mm (0.10
7.3 Hardness—TestinaccordancewithTestMethodD2240,
in.).
using a Type A durometer. If size or shape of the specimen
5.2 All cross-sectioned dimensions shall have an RMA
precludes testing of the finished surface, make measurements
Class 2 tolerance, as specified in Table 2 unless otherwise
on a squarely cut end or on a flat sliced or buffed surface.
agreed by the purchaser and seller.
Determine change in hardness after oven aging for 70 h at 100
6 1°C (212 6 2°F).
6. Sampling
6.1 When proof of conformance with this specification is 7.4 Compression Set—Test in accordance with Test Meth-
ods D395, Method B. Hold the sample under test for 22 h at
required, the samples shall be taken from the finished product
whenever possible. 100 6 1°C (212 6 2°F). Buffed specimen, taken from material
1.5 mm ( ⁄16 in.) minimum thickness may be superimposed to
6.2 When the thickness or shape of the finished product
a total thickness of 13.0 mm ( ⁄2 in.).
makes sampling, as specified in Section 6, impossible, the
7.5 Brittleness Temperature—Test in accordance with Test
manufacturershall,uponrequestofthepurchaseratthetimeof
Method D746.
ordering, furnish a sufficient number of test slabs or blocks
prepared in accordance with Methods D15 for the proper
7.6 OzoneResistance—TestinaccordancewithTestMethod
performance of the required tests. The slabs or blocks shall be
D1149 (SpecimenA). Use an ozone concentration of 100 mPa,
prepared from the compound of the same source production lot
an exposure time of 40 6 2°C (104 6 3.6°F), and a specimen
used in the gasket.
elongation of 20 %.
7. Test Methods 7.7 HeatAging—Testtheeffectsofheataginginaccordance
with Test
...