1、Designation: C542 05 (Reapproved 2011)Standard Specification forLock-Strip Gaskets1This standard is issued under the fixed designation C542; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in par
2、entheses indicates the year of last reapproval. Asuperscript epsilon () 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. Scope1.1 This specification defines the required properties oflock-strip gas
3、kets where resistance to sunlight, weathering,flame, oxidation, permanent deformation under load, anddiminution of gripping pressure are prime essentials.NOTE 1The requirement of flame propagation may be waived by thearchitect or professional engineer when doing so does not conflict withlocal codes
4、or ordinances.1.2 This specification applies only to the “locking” com-pression type of gasket, sometimes referred to as the “zipper”type.NOTE 2Structural integrity and weather-tightness of the wall requiresthe sound design and installation of the entire system of which the gasketis only one compone
5、nt.1.3 The values stated in SI units are to be regarded as thestandard.1.4 Test Method C1166, as referenced in this specification,should be used to measure and describe the properties ofmaterials, products, or assemblies in response to heat andflame under controlled laboratory conditions and should
6、not beused to describe or appraise the fire hazard or fire risk ofmaterials, products, or assemblies under actual fire conditions.However, results of this test may be used as elements of a firerisk assessment which takes into account all of the factorswhich are pertinent to an assessment of the fire
7、 hazard of aparticular end use.1.5 The following precautionary caveat pertains only to thetest method portion, Section 7, of this specification: Thisstandard does not purport to address the safety concerns, ifany, associated with its use. It is the responsibility of the userof this standard to estab
8、lish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.1.6 The committee with jurisdiction over this standard is notaware of any comparable standards published by other orga-nizations.2. Referenced Documents2.1 ASTM Standards:2C1166 Test M
9、ethod for Flame Propagation of Dense andCellular Elastomeric Gaskets and AccessoriesD15 Method of Compound and Sample Preparation forPhysical Testing of Rubber Products3D395 Test Methods for Rubber PropertyCompression SetD412 Test Methods for Vulcanized Rubber and Thermo-plastic ElastomersTensionD57
10、3 Test Method for RubberDeterioration in an AirOvenD624 Test Method for Tear Strength of Conventional Vul-canized Rubber and Thermoplastic ElastomersD746 Test Method for Brittleness Temperature of Plasticsand Elastomers by ImpactD1149 Test Methods for Rubber DeteriorationCrackingin an Ozone Controll
11、ed EnvironmentD2240 Test Method for Rubber PropertyDurometerHardness2.2 Other Standard:Rubber Handbook, Specifications for Rubber Products43. Materials and Manufacture3.1 All materials and workmanship shall be in accordancewith good commercial practice.3.2 Gaskets shall be manufactured from an ozone
12、-resistantcompound and shall not be dependent for ozone resistance onsurface protection which can be removed by abrasion, deter-gents, or other means.3.3 Gaskets shall be free of porosity, surface defects, anddimensional irregularities, particularly in the sealing area.3.4 Unless otherwise specified
13、, the material shall be black.3.5 Lubricants used in installation, shall be as recommendedby the gasket manufacturer.1This specification is under the jurisdiction of ASTM Committee C24 onBuilding Seals and Sealants and is the direct responsibility of Subcommittee C24.73on Compression Seal and Lock S
14、trip Gaskets.Current edition approved June 1, 2011. Published August 2011. Originallyapproved in 1965. Last previous edition approved in 2005 as C542 05. DOI:10.1520/C0542-05R11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org.
15、For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.4Available from Rubber Manufacturers Association, 444 Madison Ave., NewYork, NY.1Copyrig
16、ht ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4. Physical Properties4.1 The physical properties of the gasket shall conform tothe requirements specified in Table 1.5. Dimensions and Permissible Variations5.1 Minimum thickness of material b
17、etween the lockingstrip cavity and the panel or rail channel shall be 2.5 mm (0.10in.).5.2 All cross-sectioned dimensions shall have an RMAClass 2 tolerance, as specified in Table 2 unless otherwiseagreed by the purchaser and seller.6. Sampling6.1 When proof of conformance with this specification is
18、required, the samples shall be taken from the finished productwhenever possible.6.2 When the thickness or shape of the finished productmakes sampling, as specified in Section 6, impossible, themanufacturer shall, upon request of the purchaser at the time ofordering, furnish a sufficient number of te
19、st slabs or blocksprepared in accordance with Methods D15 for the properperformance of the required tests. The slabs or blocks shall beprepared from the compound of the same source production lotused in the gasket.7. Test Methods7.1 Tensile Strength and ElongationTest in accordancewith Test Methods
20、D412. Determine percentage change intensile strength and elongation after oven aging for 70 h at 1006 1C (212 6 2F).7.2 Tear ResistanceTest in accordance with Test MethodD624 using Die C.7.3 HardnessTest in accordance with Test MethodD2240, using a Type A durometer. If size or shape of thespecimen p
21、recludes testing of the finished surface, makemeasurements on a squarely cut end or on a flat sliced or buffedsurface. Determine change in hardness after oven aging for 70hat1006 1C (212 6 2F).7.4 Compression SetTest in accordance with Test Meth-ods D395, Method B. Hold the sample under test for 22
22、h at100 6 1C (212 6 2F). Buffed specimen, taken from material1.5 mm (116 in.) minimum thickness may be superimposed toa total thickness of 13.0 mm (12 in.).7.5 Brittleness TemperatureTest in accordance with TestMethod D746.7.6 Ozone ResistanceTest in accordance with TestMethod D1149 (Specimen A). Us
23、e an ozone concentration of100 mPa, an exposure time of 40 6 2C (104 6 3.6F), and aspecimen elongation of 20 %.7.7 Heat AgingTest the effects of heat aging in accor-dance with Test Method D573.7.8 Flame PropagationTest Method C1166.7.8.1 This test is designed to differentiate the flame propa-gation
24、characteristics of candidate materials used in lock-stripgaskets. It is a small-scale test which enables the specifier toexercise engineering prudence in the selection of materials. Itshould not be used to predict the performance of the testedmaterial in an actual fire situation. It should not be us
25、ed topredict fuel contribution, rate of flame spread, smoke genera-tion, or the nature of the products of combustion. Testconditions are those most conducive to flame propagation andthe method simulates the worst possible exposure condition.The specimen is mounted vertically. The igniting flame is h
26、ot;the fuel supply is unlimited; and the flame is not removed fromthe specimen throughout the test.TABLE 1 Physical Requirements and Test Methods for GasketsProperty Requirements Test MethodTensile strength, minA14 MPa (2000 psi) D412Elongation at rupture, min, % 175 D412Tear resistance, min 214 N/l
27、inear cm (120 lbf/linear in.) D624 (Die C)Hardness, durometer AA75 6 5 D2240Compression set, max, %, 22 h at 100C (212F) 35 D395 (Method B)Brittleness temperature, min 40C (40F) D746Ozone resistance, 100 mPa ozone . .100 h at 40C (104F), 20 % elongation no cracks 73 magnification D1149 (Specimen A)H
28、eat aging, 70 h at 100C (212F) D573Change in hardness, maxLoss in tensile strength, max, %Loss in elongation, max, %0 to + 10 Durometer points1540Flame propagationB100 mm (4 in.), max. C1166Lip pressureCExtruded section, minCorners, min7 N/linear cm (4 lbf/linear in.)7 N/linear cm (4 lbf/linear in.)
29、as specified (see 7.9)AIf a separate stock is used for the locking strip, it may have a hardness of 80 6 5 durometer points, and a minimum tensile strength of 12.5 MPa (1800 psi). In all otherrespects, it must meet these specifications.BThis requirement may be waived (see Note 1).CIn the case of mol
30、ded corners with integral sealing devices, the requirement for corner lip pressure may be lowered by the architect or professional engineer.TABLE 2 Cross-Sectional Tolerances Lock-Strip GasketsRMA Class 2, Schedule I, CommercialADimension,mm (in.)Tolerance,plus or minusOver 0 to 2.54 (0 to 0.10) inc
31、l. 0.32 (0.013)Over 2.54 to 4.06 (0.10 to 0.16) incl. 0.40 (0.016)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)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)Over 25.4 to40.64 (1.00 to 1
32、.60) incl. 1.25 (0.050)Over 40.64 to 63.5 (1.60 to 2.50) incl. 1.60 (0.063)ARubber Handbook, Specifications for Rubber Products, Table 12.C542 05 (2011)27.9 Lip Pressure:57.9.1 This test method determines the pressure exerted bythe gasket on collateral material positioned within the gasketchannel or
33、 channels. It simulates actual use conditions andprovides a measurement of the force required to open the lipsof the gasket channel to that distance representing the thicknessof material for which the gasket is designed. In the case ofdouble channel gaskets, this measurement is made with a solidmate
34、rial of the intended thickness in position in the channelopposite to that being tested. Thus these measurements reflectthe forces to be encountered during application.7.9.2 Apparatus:7.9.2.1 The testing machine shall be a power-driventension-testing machine of the movable cross-head type,equipped wi
35、th adjustable cross-head speed and a suitabledynamometer and indicating or recording device for measuringthe applied force within 62%.7.9.2.2 The grips to be used with the testing machinedescribed in 7.9.2.1 shall be of a type similar to those shown inFig. 1. They shall exert a uniform pressure acro
36、ss the grippingsurface, increasing as the tension increases, so as to preventuneven slipping.7.9.2.3 The lip dividers used to separate the lips of the testspecimen shall be made of stainless steel as shown in Fig. 2.Their length shall be at least equal to that of the test specimen.7.9.2.4 The metal
37、spacer to be used when testing double-channel gaskets, as shown in Fig. 1, shall be the same length asthe test specimen, the same thickness as the material the gasketis designed to hold, and at least 13 mm (12 in.) wider than thedepth of the channel.7.9.3 Test Specimen:7.9.3.1 The extruded test spec
38、imen shall be a piece of theactual gasket at least 25 mm (1 in.) in length. A minimum offour specimens from each lot shall be tested.7.9.4 Procedure:7.9.4.1 Place the test specimen in the testing machine asshown in Fig. 1, ensuring that the locking strip is in place andthat, if it is a double-channe
39、l-type gasket, the specified spaceris properly positioned in the channel opposite from that beingtested. Provide means of supporting the test assembly so thatwhen tension is applied to the channel lips, the assembly willremain in a horizontal position (Note 3). It is important toensure that the lip
40、dividers have a secure hold on the gasket lipsand that they are also securely held by the grips of the machine.Conduct the test at 23 6 1C (73.4 6 1.8F).NOTE 3When testing single channel gaskets, the spacers obviouslycannot be used. However, some means must be provided to hold the testspecimen in a
41、horizontal position during testing.7.9.4.2 Separate the lips of the gasket channel at a uniformrate of 5.1 mm (0.20 in.)/min, until the distance between thelips is equal to the minimum thickness of the material they aredesigned to hold.7.9.4.3 When the lips have been separated the specifieddistance,
42、 stop the testing machine and record the amount offorce in lbf (or kgf) required to produce this opening.7.9.4.4 Repeat 7.9.4.1-7.9.4.3 until all of the extruded chan-nels of a minimum of four specimens of each type have beentested.7.9.4.5 Calculate the lip pressure of each channel tested asfollows:
43、Lip pressure, N/linear cm lbf/linear in.!5F/L (1)where:F = force required to open the lips the specified distance, N(lbf), andL = length of test specimen in cm (in.), to the nearest 0.2cm (0.1 in.).7.9.5 ReportThe following test information shall bereported:7.9.5.1 Date of test,7.9.5.2 Type of testi
44、ng machine used,7.9.5.3 Description or numbers of the lot or lots tested,7.9.5.4 The width of the filler strip to the nearest 0.025 mm(0.001 in.), and5Supporting data are available from ASTM Headquarters. Request RR:C24-1009.FIG. 1 Tension Tester for Lip PressureC542 05 (2011)37.9.5.5 Lip pressure f
45、or each gasket channel tested. 8. Keywords8.1 compression; elastomer; elastomeric; gasket; locking;lock-strip; preformed; seal; strip; zipperFIG. 2 Lip DividersC542 05 (2011)4ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentio
46、nedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee an
47、d must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting o
48、f theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box
49、 C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).C542 05 (2011)5
