1、Designation: C 1643 08Standard Test Method toMeasuring the Post Dispensing Volumetric Expansion ofAerosol Foam Sealants1This standard is issued under the fixed designation C 1643; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、 year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method measures the volumetric expansion ofaerosol foam sealants after dispensing.1.2 This test me
3、thod provides a means for estimating thequantity of initial material required to dispense in order to filla cavity.1.3 Aerosol foam sealants are used for a variety of applica-tions intended to reduce airflow through the building envelope.1.4 This test method applies to two types of single compo-nent
4、 aerosol foam sealants: polyurethane and latex.1.5 There are no other known standard test methods tomeasure aerosol foam sealants post dispensing expansion.1.6 Values are reported in SI units only. Certain apparatusand supply items are referenced in inch-pound units forpurchasing purposes.1.7 This s
5、tandard 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 use.2. Referenced Documents2.1
6、 ASTM Standards:2C 717 Terminology of Building Seals and SealantsC 1620 Specification for Aerosol Polyurethane and AerosolLatex Foam Sealants3. Terminology3.1 Definitions:3.1.1 Refer to Terminology C 717 for definitions of thefollowing terms used in this test method: aerosol foam sealant,post dispen
7、sing contraction, post dispensing expansion.4. Summary of Test Method4.1 Procedure AFor single component polyurethane aero-sol foam sealants.4.1.1 Aerosol foam sealant is dispensed into aluminumchannels.4.1.2 Post dispensing volumetric expansion is determinedby the volume of the foam expanded from t
8、he channel.4.1.3 Post dispensing volumetric expansion factor is calcu-lated by measuring the volumetric displacement of the curedfoam.4.2 Procedure BFor single component latex aerosol foamsealants.4.2.1 Aerosol foam sealant is dispensed onto aluminumpanels.4.2.2 Post dispensing volumetric expansion
9、is measured bythe change of the foam height.4.2.3 Post dispensing volumetric expansion factor is calcu-lated by measuring the height of the foam.5. Significance and Use5.1 Post dispensing volumetric expansion factor Findicatesthe ratio of the fully cured foam sealant volume and theinitially dispense
10、d foam sealant volume. For example, if theexpansion factor Fwere 2, the fully cured foam would doubleits initial volume; therefore, one should fill 50 % of the cavityuniformly to anticipate the full coverage upon curing.5.2 Post dispensing volumetric expansion factor Fdoes notpredict the performance
11、 capability of the foam sealants of thesuitability for the intended applications.1This test method is under the jurisdiction ofASTM Committee C24 on BuildingSeals and Sealants and is the direct responsibility of Subcommittee C24.61 onAerosol Foam SealantsCurrent edition approved March 15, 2008. Publ
12、ished April 2008.2For 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.1Copyright ASTM International, 100 Barr Harb
13、or Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.3 This test method is intended to lend guidance in productselection as related to the post dispensing expansion charac-teristics of the aerosol foam sealants.5.4 This test method recognizes that the results are reflectiveof con
14、trolled laboratory conditions. Post dispensing expansionin field applications may vary according to temperature,humidity, and surfaces that the aerosol foam sealants are incontact with.6. Apparatus6.1 Aluminum channels, External dimensions: length =15.25 cm (6 in.), width = 1.91 cm (34 in.), height
15、= 1.91 cm (34in). Internal dimensions: length = 15.25 cm (6 in.), width =1.27 cm (0.5 in.), height = 1.59 cm (58 in.). Wall thickness =0.32 cm (18 in).6.2 Aluminum panel, 22.86 by 7.62 cm (9 by 3 in.) by 0.06cm (0.025 in.).6.3 Digital caliper, accurate to 0.01 mm.6.4 Top loading balance, readable to
16、 0.01 g.6.5 Wood tongue depressors.6.6 Graduated cylinder1000 mL, with 5 mL increments.7. Test Specimens and Substrates7.1 All sample preparation and test should be done atstandard laboratory conditions of 23 6 2C and 50 6 5%relative humidity.7.2 Each channel shall be wiped clean with rubbing alcoho
17、l24 h before testing7.3 Polyurethane aerosol foam sealants shall be dispenseddirectly into the aluminum channels. A total of five aluminumchannels are required per test.7.4 Aluminum panels shall be wiped clean with rubbingalcohol 24 h before testing.7.5 Latex foam sealants shall be dispensed directl
18、y onto thealuminum panels. Divide each panel with a permanent markerinto two sections by drawing a line mid-way along the width.A total of five aluminum panels are required per test.7.6 For each product tested it is essential to follow themanufacturers label directions and to use the dispenser sup-p
19、lied with the product.8. Conditioning8.1 Condition both foam sealants and substrates understandard laboratory conditions of 23 6 2C and 50 6 5%relative humidity for a minimum of 24 h before testing.9. Procedure A9.1 Prepare the substrates as described in 7.2 and 7.3.9.2 Prepare the aerosol foam seal
20、ants for dispensing permanufacturers directions.9.3 Dispense13 of the full contents of the aerosol foamsealant product to a waste can. Record the weight of theproduct before filling the first channel and after filling the lastchannel.9.4 Fill a total of 5 channels using the middle13 of theproduct.9.
21、5 Fill each channel evenly and visually full to the flush ofthe edges. Do not strike off.9.6 Allow foam specimens to cure for 24 h at standardlaboratory conditions of 23 6 2C and 50 6 5 % relativehumidity.9.7 Fill a 1000 mL graduated cylinder with 500 mL tapwater. Carefully immerse one cured foam sp
22、ecimen in thecylinder. Record to the nearest millilitre as V. Repeat for eachfoam specimen.10. Calculations for Procedure A10.1 Calculate the post dispensing volumetric expansionfactor (F) for each specimen:F 5 Final foam volume/Initial foam volume5 V 500 VChannel!/VInitial Foam5 V 50025!/315 V2525!
23、/31 (1)where:VChannel=25mLVInitial Foam=31mL10.2 Calculate the average post dispensing volumetric ex-pansion factor Ffor each product test:F5 ( F/n (2)where:n = 5 or number of specimens tested per product.Calculate standard deviation.11. Procedure B11.1 Prepare the substrates as described in 7.4 and
24、 7.5.11.2 Prepare the aerosol foam sealants for dispensing permanufacturers directions.11.3 Dispense13 of the full contents of aerosol foam sealantproduct to a waste can. Record the weight of the product beforemaking the first bead and after making the last bead.11.4 Dispense a total of 5 beads (one
25、 at a time) using themiddle13 of the product.11.5 Dispense each bead approximately 15 cm long and 1.5cm wide directly onto the aluminum panel. Immediately (2.5.14. Precision and Bias14.1 No precision and bias values have been developed forthis test method. Plans to establish precision and bias state
26、-ments are being made at the time of publication of thisstandard.15. Keywords15.1 aerosol; aerosol foam; air barrier from sealant; airexfiltration; air infiltration; foam sealant; latex foam sealant;polyurethane foam sealantASTM International takes no position respecting the validity of any patent r
27、ights asserted in connection with any item mentionedin 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 a
28、ny time by the responsible technical committee and 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
29、will receive careful consideration at a meeting of 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
30、ASTM International, 100 Barr Harbor Drive, PO Box 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).C1643083
