1、Designation: F2524 06 (Reapproved 2013)Standard Practice forDetermination of Volatile Content for Formed-in-PlaceGaskets (FIPG) Silicone Adhesives and Sealants forTransportation Applications1This standard is issued under the fixed designation F2524; the number immediately following the designation i
2、ndicates the year oforiginal adoption or, in the case of revision, 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 practice covers the quantitative d
3、etermination ofthe volatile matter evolved during the curing process ofsilicone adhesives and sealants for transportation applications.1.2 The values stated in SI units are to be regarded as thestandard. The values in parentheses are for information only.1.3 This standard does not purport to address
4、 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 ASTM Standards:2D4230 Test Method
5、 of Measuring Humidity with Cooled-Surface Condensation (Dew-Point) HygrometerE145 Specification for Gravity-Convection and Forced-Ventilation Ovens3. Terminology3.1 Definitions:3.1.1 FIPG by-products, nchemicals that are releasedduring the curing process.3.1.2 formed-in-place gaskets (FIPG), n one-
6、 or two-component adhesive or sealant applied wet, uncured, to a jointsurface where the mating parts are assembled before the curingprocess is complete.3.1.2.1 DiscussionWhen fully cured, it forms a barrier tomedia migration across the joint.3.1.3 multicomponent FIPG, nFIPG that is packaged intwo or
7、 more parts, which are combined before application, andupon combination, a coreactant from one part of the adhesivechemically reacts, at ambient conditions, with a coreactantfrom another part of the FIPG.3.1.4 radiation-cured FIPG, nFIPG that contains unre-acted monomers or oligomers that are polyme
8、rized by expo-sure to radiation such as ultraviolet (UV) or microwave.3.1.4.1 DiscussionCure conditions and equipment mustbe specified by FIPG manufacturer and shall be used in placeof the humidity cure activation. Conditions and equipmentshall be detailed in the final report.3.1.5 volatile content,
9、 nLow molecular weight chemicals,left unbound by the cured sealant system, which are releasedinto the ambient atmosphere.4. Summary of Practice4.1 This practice is used to determine the volatile content ofsilicone adhesives and sealants upon curing for transportationapplications.5. Significance and
10、Use5.1 The quantity of volatile components in FIPG siliconeadhesive and sealant by-products can be established by this testmethod. This test method does not identify the components.6. Apparatus6.1 Humidity Chamber with Temperature ControllerAforced ventilation oven conforming to the requirements for
11、Type IIA in Specification E145 with humidity control capabil-ity. The oven should be capable of maintaining a temperatureof 40 6 1C.6.1.1 The oven shall be equipped with a National Institute ofStandards and Technology (NIST) traceable calibrated ther-mometer or thermocouple.6.1.2 The oven temperatur
12、e shall be controlled by anaccurate, reliable thermoregulator, maintaining the set pointwithin 61.0C or better.6.1.3 The inside of the oven shall be free of contaminationor surface deposits. Stainless steel oven liner should be used toreduce corrosion caused by continued exposure to decomposi-tion g
13、ases.1This practice is under the jurisdiction ofASTM Committee F03 on Gaskets andis the direct responsibility of Subcommittee F03.50 on Analytical Test Methods.Current edition approved May 1, 2013. Published May 2013. Originallyapproved in 2006. Last previous edition approved in 2006 as F2524 06. DO
14、I:10.1520/F2524-06R13.2For 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
15、Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.2 Sample ContainerA weighing vessel of low shapedesign in glass, aluminum, or stainless steel of sufficient size tohold a 10-g sample. An aluminum weighing dish, 57 mm indiameter and 18 mm in depth, is suitable.6.3 BalanceA
16、 calibrate weighing balance with a precisionto within 60.001 g.7. Preparation of Apparatus7.1 Maintain the humidity chamber at the temperature andhumidity of the test for at least 1 h before insertion of thespecimens.7.2 Before test operation, verify the uniformity of tempera-ture within the oven ac
17、cording to Specification E145. Theairflow in the oven should be 0.3 m3/min (10 ft3/min).7.3 Before test operation, verify the relative humidity of theenvironmental chamber using a measurement device in accor-dance with Test Method D4230.8. Procedure8.1 Dry the weighing vessel in the oven at 110 6 1C
18、 for30 min and cool to room temperature in a desiccator. Tare theweighing vessel to the nearest 0.001 g.8.2 Spread approximately 10 g of FIPG sample evenly overthe bottom of the weighing vessel and weigh to the nearest0.001 g. Record the initial sample weight, M.8.3 Place the sample-filled weighing
19、dish in the humiditychamber controlled at 40 6 1C and 90 6 3 % relativehumidity.8.4 After 24 h, remove the weighing vessels, cool to roomtemperature in a desiccator, and weigh to the nearest 0.001 g.Return the weighing dish to the humidity chamber for anadditional 4 h, cool to room temperature in th
20、e desiccator, andreweigh. Constant sample weight is reached when the succes-sive weighing differs by 0.001 g or less; if the weight variationis greater than 0.001 g, continue the 4-h heating-weighingcycle until constant weight is obtained. Record this weight asM.8.5 Test a minimum of three samples a
21、nd average theresults.9. Calculation9.1 For each determination, calculate the weight percent ofvolatile matter by-products from FIPG as follows:% Volatile 5 M 2 M!/M# 3100 (1)where:M = initial sample weight as recorded in 8.2, andM = final sample weight as recorded in 8.4.10. Report10.1 Report the f
22、ollowing information:10.1.1 Percent volatile to the nearest 0.01 weight percent.11. Keywords11.1 by-products; curing process; FIPG; humidity chamber;silicone adhesives and sealants; volatile matterASTM International takes no position respecting the validity of any patent rights asserted in connectio
23、n 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 any time by the responsible
24、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 will receive careful consid
25、eration 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 ASTM International, 100 Bar
26、r 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).F2524 06 (2013)2
