ASTM E2178-2011 Standard Test Method for Air Permeance of Building Materials《建材航空渗透系数的标准试验方法》.pdf
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1、Designation: E2178 11Standard Test Method forAir Permeance of Building Materials1This standard is issued under the fixed designation E2178; 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 pare
2、ntheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method is to determine the air permeance ofbuilding materials at various pressure differentials with theintent of determining an assigned a
3、ir permeance rate of thematerial at the reference pressure difference (DP)of75Pa.1.2 The method is intended to assess flexible sheet or rigidpanel-type materials using a 1 m 3 1 m specimen size.1.3 The values stated in SI units are to be regarded asstandard. No other units of measurements are includ
4、ed in thisstandard.1.4 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 appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to
5、use.2. Referenced Documents2.1 ASTM Standards:2E283 Test Method for Determining Rate of Air LeakageThrough Exterior Windows, Curtain Walls, and DoorsUnder Specified Pressure Differences Across the SpecimenE631 Terminology of Building ConstructionsE1677 Specification for Air Barrier (AB) Material or
6、Sys-tem for Low-Rise Framed Building Walls3. Terminology3.1 Definitions:3.1.1 For definitions of general terms related to buildingconstruction used in this test method, refer to TerminologyE631.3.2 Definitions of Terms Specific to This Standard:3.2.1 air permeancethe rate of air flow (L/s), per unit
7、 area(m2) and per unit static pressure differential (Pa).4. Significance and Use4.1 The purpose of this test is to measure the air permeanceof flexible sheet or rigid panel-type materials. The results ofthis test may be useful in determining suitability of thatmaterial as a component of an air retar
8、der system.4.2 This method does not address the installed air leakageperformance of building materials. The installed performanceof air retarder materials and air retarder systems in low-riseframed wall construction is addressed in Specification E1677.5. Sampling5.1 The number of specimens to be tes
9、ted shall be suitableto establish an air leakage rate which is representative of theproduct. In no case shall less than five specimens be tested.NOTE 1Because of the variability in the manufacture of a product, thenumber of specimens to be tested may vary from product to product.Certain materials ma
10、y have standard methods for sampling that shall beused to sample these materials.6. Test Apparatus6.1 A schematic of the air leakage test apparatus is pre-sented in Fig. 1.6.1.1 Airtight Test ChamberThe airtight test chambershall be at least 320 mm deep and capable of receivinga1mby 1 m test specime
11、n, anchored to the test chamber by meansof a compression frame and clamping devices. The testchamber and compression frame shall be stiff enough to limitdeflection within the operating flexibility of the gaskets used toseal the test specimen to the chamber. Two parallel ribbons ofself-adhesive gaske
12、t material shall be applied at all sealingpoints of the apparatus/test specimen assembly. The gasketribbons shall be made of medium-density gasket material thatcan be fused or glued at joints. The test apparatus shall containan over-pressure control device and windows to verify thespecimen installat
13、ion.6.1.2 Flow Measuring DevicesThe flow measuring de-vices used to gage the air flow through the test specimen shallbe capable of measuring air flow rate from 1 3 10-6m3/s (.001L/s) up to 1.88 3 10-2m3/s (18.8 L/s), with an accuracy of 63 % of the reading.6.1.3 Pressure Measuring DevicesThe static
14、pressure dif-ferential across the test specimen shall be measured by pressuremeasuring devices with an accuracy of 6 0.5 % of the pressure1This test method is under the jurisdiction of ASTM Committee E06 onPerformance of Buildings and is the direct responsibility of Subcommittee E06.41on Air Leakage
15、 and Ventilation Performance.Current edition approved Nov. 1, 2011. Published December 2011. Originallyapproved in 2001. Last previous edition approved in 2003 as E2178 03. DOI:10.1520/E2178-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at s
16、erviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.reading. The laboratory barometric pressure shall be
17、 measuredwith a device capable of measuring barometric pressure within6 3 % of the reading.6.1.4 PipingThe piping connecting the flow measuringdevices and the vacuum blower shall be airtight and containflow control devices to regulate the static pressure across thetest specimen within 60.5 % of the
18、pressure reading. The pipeconnection to the test chamber shall contain an air filter toprevent dust or particulate matter from affecting the flowmeasuring device reading. The piping downstream and up-stream of the flow measuring device shall be designed so theflow regime does not affect the devices
19、accuracy. The pipingshall contain a temperature measuring device capable ofmeasuring air temperature within 60.5C to convert all flowrate measurement to STP.6.1.5 Vacuum BlowerThe blower used to create a vacuumin the test chamber shall be able to produce static pressuredifferential across the test s
20、pecimen within 60.5 % of thepressure reading.7. Specimen Preparation7.1 Conditioning for TestsUnless otherwise stated, allspecimens to be tested shall be conditioned for a minimumperiod of seven days at 21 6 1C and 40 6 5 % RH.7.2 Flexible Sheet MaterialsDue to lack of rigidity, flex-ible materials
21、shall be tested over a rigid support having an airpermeance much greater than the test specimen. An open grillor wire mesh/screen, fabricated with welded wire having aminimum of 25 mm 3 25-mm-square grid (or an alternativemeans that provides an equivalent degree of support and airpermeance) shall be
22、 used for this purpose. The wire meshportion of the support shall be welded or otherwise mechani-cally secured to a solid metal frame which shall be gasketedand compressed within the test frame. A detailed description ofthe support grill, including the gage wire used, shall beincluded in the test re
23、port. Fig. 2 shows the preparation for atypical flexible sheet material. The following procedure shallbe used to seal the perimeter of the specimen:FIG. 1 General Configuration of Test ApparatusE2178 1127.2.1 Apply a self-adhesive gasket ribbon over the frame ofthe wire mesh/screen around the entire
24、 perimeter of the testarea under investigation (1 m 3 1 m);7.2.2 Apply a second self-adhesive gasket ribbon along theperimeter of the first ribbon in 7.2.1;7.2.3 All joints in the gasket ribbons shall be fused or glued;7.2.4 Cut the flexible sheet material specimen to 1100 mm3 1100 mm;7.2.5 Upon rem
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