1、Designation: E2342/E2342M 10 (Reapproved 2015)1Standard Test Method forDurability Testing of Duct Sealants1This standard is issued under the fixed designation E2342/E2342M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year o
2、f 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.1NOTEUnits statement was inserted in 1.4 and units information was corrected editorially in February 2015.INTRODUCTIONDuct leaka
3、ge has been identified as a major source of energy loss in residential buildings. Most ductleakage occurs at the connections to registers, plenums, or branches in the duct system. At each ofthese connections a method of sealing the duct system is required. Typical sealing methods includetapes or mas
4、tics applied around the joints in the system. Field examinations of duct systems havetypically shown that these seals tend to fail over extended periods of time.The proposed method evaluates the durability of duct sealants by blowing heated air into testsections, combined with a pressure difference
5、between the test sections and their surroundings. Thetemperatures and pressures were chosen to expose the test sections to typical conditions that are foundin residential duct systems. The duct leakage site geometry represents a leakage site commonly foundin duct systems. The test sections are const
6、ructed from standard duct fittings.1. Scope1.1 This test method describes an accelerated aging test forevaluating the durability of duct sealants by exposure totemperatures and static pressures characteristic of residentialduct systems.1.2 This test method is intended to produce a relativemeasure of
7、 the durability of duct sealants. This standard doesnot measure durability under specific conditions of weather andbuilding operation that might be experienced by an individualbuilding and duct system. Instead it evaluates the sealantmethod under fixed conditions that do not include the manifoldeffe
8、cts of installation practice.1.3 This test method only addresses sealants not mechanicalstrength of the connections.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsyst
9、em shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish
10、 appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. For specific hazardstatements see Section 7.2. Referenced Documents2.1 ASTM Standards:2E631 Terminology of Building Constructions3. Terminology3.1 Terminology E631 defines much of the t
11、erminologyused in this test method.3.2 Definitions of Terms Specific to This Standard:3.2.1 air-leakage ratethe volume of air movement perunit time across the duct wall.3.2.2 duct sealanta method or material, or both, forsealing leaks in forced air thermal distribution duct systems.3.2.3 durabilityt
12、he capability of maintaining the service-ability of a product, component, or assembly over a specifiedtime.4. Summary of Test Method4.1 To evaluate sealant durability this test method uses astandardized joint configuration with controlled temperature1This test method is under the jurisdiction of AST
13、M Committee E06 onPerformance of Buildings and is the direct responsibility of Subcommittee E06.41on Air Leakage and Ventilation Performance.Current edition approved Jan. 1, 2015. Published February 2015. Originallyapproved in 2003. Last previous edition approved in 2010 as E2342 10. DOI:10.1520/E23
14、42_E2342M-10R15E01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Har
15、bor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1and pressure differences. These temperatures and pressures arechosen to represent conditions found in residential duct sys-tems. The test apparatus applies temperature and pressureconditions and measures how well the sealant per
16、forms overtime.5. Significance and Use5.1 Residential duct systems are often field designed andassembled. There are many joints, often of dissimilar materialsthat require both mechanical connection and air sealing.Without this sealing, duct systems would be extremely leakyand hence inefficient. Whil
17、e some duct sealants are rated ontheir properties at the time of manufacture or during storage,none of these ratings adequately addresses the in-servicelifetime. This test method has been developed to address thisdurability issue.5.2 This standard applies to products which list duct sealingas one of
18、 their uses. This includes duct tape (cloth, metal foil,or plastic backed), mastics, and sprayed/aerosol sealants. Itdoes not apply to caulks or plaster patches that are not intendedto be permanent duct sealing methods.5.3 The standard duct leak site is a collar to plenumconnection for round duct th
19、at is 10 to 20 cm 4 to 8 in. indiameter. This perpendicular connection was chosen becausealmost all residential duct systems have this type of connectionand in field observations of duct systems, it is often this type ofconnection that has sealant failure.6. Apparatus6.1 The following is a general d
20、escription of the requiredapparatus. Any arrangement of equipment using the sameprinciples and capable of performing the test procedure withinthe allowable tolerances is permitted.6.2 Major ComponentsThere are two major componentsrequired to perform the testing: a test section leakage measure-ment d
21、evice (Fig. 1) and a durability test apparatus (Fig. 2).6.2.1 Test Section Leakage Measuring DeviceAdevice formeasuring the leakage of individual test sections. This deviceshall consist of a fan to blow air into the test section, a flowmeasurement device for measuring the flow rate in the testsectio
22、n, a pressure measuring device for measuring the pres-sure difference between the inside and outside of the testsection, and a cap to seal the end of the test section. See Fig.2. For these test section leakage measurements, the air flowmeasuring device shall have an accuracy of 60.085 m3/h 0.05cfm o
23、r 61 % of the measured flow, whichever is greater.6.2.2 Durability Test ApparatusA device for blowing hotair through one or more test sections. This device is comprisedof the following components.6.2.2.1 Air-Moving EquipmentA fan that is capable ofmoving air through the test sections. The fan must b
24、e selectedto provide the required flow rates and pressure differences. Inaddition, the fan must be selected to be capable of operating atthe hot conditions existing in the test apparatus.FIG. 1 Schematic of Durability ApparatusE2342/E2342M 10 (2015)126.2.2.2 Pressure-Measuring DevicesManometers or p
25、res-sure indicators to measure pressure difference with an accuracyof 60.2 Pa 0.0008 in. of water or 61 % of the measuredpressure, whichever is greater.6.2.2.3 Temperature-Measuring DevicesInstruments tomeasure temperature with an accuracy of 61C 2F. The testsection surface temperatures shall be mea
26、sured using surfacemount temperature sensors with heat transfer paste between thesensor and the test section.6.3 Test SectionSheet metal duct system componentscombined to create a plenum to collar connection. The testsection consists of a flange and a collar with fingers to fold inand out of the hol
27、e in the flange. The gap between the flangeand the collar shall be 6 mm 14 in. all the way around. Thecollar shall be centered in the flange. Sheet metal screws shallbe used to mechanically connect the collar to the flange. SeeFig. 3.7. Hazards7.1 Eye ProtectionDucts should not break at the pressure
28、differences normally applied to the test structure. However, foradded safety, adequate precautions such as the use of eyeprotection should be taken to protect the personnel.7.2 Safety ClothingUse safety equipment required forgeneral laboratory work, including safety shoes, and workgloves.7.3 Equipme
29、nt GuardsThe air-moving equipment shallhave a proper guard or cage to house the fan, motor, andpulleys and to prevent accidental access to any moving parts ofthe equipment.7.4 Noise ProtectionMake hearing protection availablefor personnel who must be close to the noise that may begenerated by the fa
30、n.7.5 Debris and FumesDuct materials may decomposeduring the test releasing particles and fumes into the air.Adequate protection must be provided in the form of ventila-tion of the test space or other appropriate means.8. Procedure8.1 Construct test sections of the plenum to collar joint typeshown i
31、n Fig. 3. The test sections shall use ducts of 100 to 200mm 4 to 8 in. diameter round sheet metal. The sheet metalsections shall be mechanically connected using sheet metalscrews.8.2 The test sections shall be tested for their air leakagebefore and after they are sealed. The temperature of air flowi
32、ngthrough the test section and flowmeter shall be measured andthe leakage tests for the test sections shall be performed withthe temperature of air flowing through the test section and airflowmeter between 15 and 25C 59 and 77F. All measuredair flows shall be corrected to standard conditions usingin
33、structions provided by the air flowmeter manufacturer.8.2.1 Connect the unsealed test section to the test sectionleakage measurement device as shown in Fig. 2. Ensure thatthe cap on the end of test section and all other connections aresealed. Pressurize the test section to 25 Pa 0.1 in. water andrec
34、ord the flow through the flowmeter. This is the unsealed testsection leakage Qunsealed. The acceptable range for this un-sealed leakage is 0.050 to 0.067 m3/(hmm) 0.75 to 1.0 cfmper in. of perimeter of the test section plenum to collarconnection. If the test section is outside this range it needs to
35、be rebuilt and the hole size adjusted until it meet this criteria,or not used for testing.8.2.2 Apply the sealant to the test section and perform theleakage test of 8.2.1 with the sealed section. The sealant shallbe applied using manufacturers instructions. If no instructionscome with the sealant, t
36、hen the sealant shall be applied ascarefully as possible. This careful application includes ensur-ing that surfaces to be sealed are clean and free from dust, dirt,and excess lubricants used in the manufacture of many sheetmetal duct fittings. To ensure removal of oil residue, thesurfaces should be
37、cleaned using an appropriate solvent. Agood practice is to photograph each test section before testingto document how the sealant was originally applied. Record theinitial leakage flow at 25 Pa 0.1 in. water, Qinitial.IfQinitialisFIG. 2 Schematic of Apparatus for Measuring Leakage of Test SectionsE2
38、342/E2342M 10 (2015)13greater than 2 % of Qunsealedthen the initial sealing is inad-equate and the test section shall not be used. Record the dateand time of the initial leakage test.8.3 Place the test sections in the durability testing apparatus.Record the date and time of the placement of the test
39、 section inthe apparatus.8.4 The test sections shall be removed from the durabilityapparatus on a weekly basis to have the leakage test in 8.2.1performed to measure Qleak.8.5 The durability test apparatus shall be constructed andoperated to meet the following parameters:8.5.1 The static pressure dif
40、ference between the inside of thetest section and its surroundings shall be 200 Pa 6 20 Pa 0.86 0.08 in. of water, with the air inside the duct at a higherpressure than outside.8.5.2 The test section surface temperature shall be con-trolled to be within the range of 82 to 93C 180 to 200Fmeasured on
41、the outside surface of the test section within 5 cm2 in. of the gap between the flange and the collar.8.5.3 The test sections shall be enclosed so that theirexposure to ultraviolet radiation (for example, sunlight) isminimized.8.5.4 The apparatus shall be as airtight as possible with anintentional h
42、ole added on the suction side of the air movingfan. The intentional hole shall be continuously monitored formake-up air flow rate. The monitored hole is for the purpose ofadmitting make-up air when leakage occurs at a test section.Some duct sealants fail suddenly with a complete loss of sealon the t
43、est section. This is called catastrophic failure. Whencatastrophic failure of the test seal occurs, an abrupt increase inmake-up air flow will occur. This monitoring allows the time ofcatastrophic failures to be recorded.8.5.5 The following parameters shall be continuously moni-tored at a sampling f
44、requency of once every ten seconds (ormore often if desired).8.5.5.1 Surface temperature of each test section,8.5.5.2 Pressure difference between inside each test sectionand its surroundings, and8.5.5.3 Air flow through makeup air hole(s).8.5.6 These parameters shall be recorded every hour oftesting
45、 for each sample as follows:8.5.6.1 Temperatures: the minimum, maximum, and aver-age for each hour;8.5.6.2 Pressures: the minimum, maximum, and average foreach hour; and8.5.6.3 Makeup air flow: maximum for the hour.9. Data Analysis and Calculations9.1 The weekly leakage measurement, Qleak, for each
46、testsection shall be compared to the air leakage reduction providedby the seal; that is, the difference between unsealed leakage,Qunsealed, and the initial leakage Qinitial. The sealant failurecriterion is when the increase in leakage above Qinitialreaches10 % of this value, that is:Qleak.0.1 Qunsea
47、led2 Qinitial!1Qinitial# (1)9.1.1 The time to failure shall be the difference between thetime the sample was placed in the durability test apparatus andthe time at which it failed. This is typically measured in days.FIG. 3 Schematic of Typical Test Section AssemblyE2342/E2342M 10 (2015)149.2 When a
48、catastrophic failure is detected by the monitor-ing system, the time of failure shall be recorded. The failed testsection shall be identified and tested immediately upon failure.9.3 A plot of weekly (and final) leakage versus time shall bemade. An example is given in Fig. 4.9.4 Obtain the mean, maxi
49、mum, and minimum recordedsurface temperatures and pressure differences for the testsection during the test from the recorded data.10. Reporting Requirements10.1 Users of this test method shall provide the followinginformation for each test section:10.1.1 Test section description: type of sealant (mastic, tapeetc.), manufacturer of sealant, manufacturers identifying code,or manufacturers description for sealant, lot, and batch num-bers (if available);10.1.2 Date and time of test start;10.1.3 Date and time of failure;10.1.4
