1、Designation: C1643 08C1643 14Standard Test Method toMeasuring the Post Dispensing Volumetric Expansion ofAerosol Foam Sealants1This standard is issued under the fixed designation C1643; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisio
2、n, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method measures the volumetric expansion of aerosol foam sealants after dispensing.1.2 This t
3、est method provides a means for estimating the quantity of initial material required to dispense in order to fill a cavity.1.3 Aerosol foam sealants are used for a variety of applications intended to reduce airflow through the building envelope.1.4 This test method applies to two types of single com
4、ponent aerosol foam sealants: polyurethane and latex.1.5 There are no other known standard test methods to measure aerosol foam sealants post dispensing expansion.1.6 Values are reported in SI units only. Certain apparatus and supply items are referenced in inch-pound units for purchasingpurposes.1.
5、7 This standard does not purport to address all of the safety concerns, if any associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Docume
6、nts2.1 ASTM Standards:2C717 Terminology of Building Seals and SealantsC1620 Specification for Aerosol Polyurethane and Aerosol Latex Foam Sealants3. Terminology3.1 Definitions:3.1.1 Refer to Terminology C717 for definitions of the following terms used in this test method: aerosol foam sealant, postd
7、ispensing contraction, post dispensing expansion.expansion, and standard conditions.4. Summary of Test Method4.1 Procedure AFor single component polyurethane aerosol foam sealants.4.1.1 Aerosol foam sealant is dispensed into aluminum channels.4.1.2 Post dispensing volumetric expansion is determined
8、by the volume of the foam expanded from the channel.4.1.3 Post dispensing volumetric expansion factor is calculated by measuring the volumetric displacement of the cured foam.4.2 Procedure BFor single component latex aerosol foam sealants.4.2.1 Aerosol foam sealant is dispensed onto aluminum panels.
9、4.2.2 Post dispensing volumetric expansion is measured by the change of the foam height.4.2.3 Post dispensing volumetric expansion factor is calculated by measuring the height of the foam.5. Significance and Use5.1 Post dispensing volumetric expansion factor F indicates the ratio of the fully cured
10、foam sealant volume and the initiallydispensed foam sealant volume. For example, if the expansion factor F were 2, the fully cured foam would double its initialvolume; therefore, one should fill 50 % of the cavity uniformly to anticipate the full coverage upon curing.1 This test method is under the
11、jurisdiction of ASTM Committee C24 on Building Seals and Sealants and is the direct responsibility of Subcommittee C24.61 on AerosolFoam SealantsCurrent edition approved March 15, 2008June 1, 2014. Published April 2008July 2014. Originally approved in 2008. Last previous edition approved in 2008 as
12、C1643-08.DOI: 10.1520/C1643-08.10.1520/C1643-14.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document
13、 is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appr
14、opriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.2 Post dispensing volumetric expansion factor F does not pr
15、edict the performance capability of the foam sealants of thesuitability for the intended applications.5.3 This test method is intended to lend guidance in product selection as related to the post dispensing expansion characteristicsof the aerosol foam sealants.5.4 This test method recognizes that th
16、e results are reflective of controlled laboratory conditions. Post dispensing expansion infield applications may vary according to temperature, humidity, and surfaces that the aerosol foam sealants are in contact with.6. Apparatus6.1 Aluminum channels, External dimensions: length = 15.25 cm (6 in.),
17、 width = 1.91 cm (34 in.), height = 1.91 cm (34 in).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 (18in).6.2 Aluminum panel, 22.86 by 7.62 cm (9 by 3 in.) by 0.06 cm (0.025 in.).6.3 Digital caliper, accurate to 0.01 mm.
18、6.4 Top loading balance, readable to 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 at standard laboratory conditions of 23 6 2C and 50 6 5 % relativehumidity.conditions.7.2 Each
19、 channel shall be wiped clean with rubbing alcohol 24 h before testing7.3 Polyurethane aerosol foam sealants shall be dispensed directly into the aluminum channels. A total of five aluminumchannels are required per test.7.4 Aluminum panels shall be wiped clean with rubbing alcohol 24 h before testin
20、g.7.5 Latex foam sealants shall be dispensed directly onto the aluminum panels. Divide each panel with a permanent marker intotwo 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 the manufa
21、cturers label directions and to use the dispenser supplied withthe product.8. Conditioning8.1 Condition both foam sealants and substrates under standard laboratory conditions of 23 6 2C and 50 6 5 % relativehumidity conditions for a minimum of 24 h before testing.9. Procedure A9.1 Prepare the substr
22、ates as described in 7.2 and 7.3.9.2 Prepare the aerosol foam sealants for dispensing per manufacturers directions.9.3 Dispense 13 of the full contents of the aerosol foam sealant product to a waste can. Record the weight of the product beforefilling the first channel and after filling the last chan
23、nel.9.4 Fill a total of 5 channels using the middle 13 of the product.9.5 Fill each channel evenly and visually full to the flush of the edges. Do not strike off.9.6 Allow foam specimens to cure for 24 h at standard laboratory conditions of 23 6 2C and 50 6 5 % relativehumidity.conditions.9.7 Fill a
24、 1000 mL graduated cylinder with 500 mL tap water. Carefully immerse one cured foam specimen in the cylinder.Record to the nearest millilitre as V. Repeat for each foam specimen.10. Calculations for Procedure A10.1 Calculate the post dispensing volumetric expansion factor (F) for each specimen:F 5Fi
25、nal foam volume/Initial foam volume5V 25002VChannel!/VInitial Foam5V 2500225!/315V 2525!/31 (1)C1643 142where:VChannel = 25 mLVInitial Foam = 31 mL10.2 Calculate the average post dispensing volumetric expansion factor F for each product test:F 5(F/n (2)where:n = 5 or number of specimens tested per p
26、roduct.Calculate standard deviation.11. Procedure B11.1 Prepare the substrates as described in 7.4 and 7.5.11.2 Prepare the aerosol foam sealants for dispensing per manufacturers directions.11.3 Dispense 13 of the full contents of aerosol foam sealant product to a waste can. Record the weight of the
27、 product beforemaking the first bead and after making the last bead.11.4 Dispense a total of 5 beads (one at a time) using the middle 13 of the product.11.5 Dispense each bead approximately 15 cm long and 1.5 cm wide directly onto the aluminum panel. Immediately (2.5.14. Precision and Bias14.1 No pr
28、ecision and bias values have been developed for this test method. Plans to establish precision and bias statementsare being made at the time of publication of this standard.15. Keywords15.1 aerosol; aerosol foam; air barrier from sealant; air exfiltration; air infiltration; foam sealant; latex foam
29、sealant;polyurethane foam sealantC1643 143ASTM International takes no position respecting the validity of any patent rights 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 t
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