1、Designation: F 2524 06Standard Practice forDetermination of Volatile Content for Formed-in-PlaceGaskets (FIPG) Silicone Adhesives and Sealants forTransportation Applications1This standard is issued under the fixed designation F 2524; the number immediately following the designation indicates the yea
2、r 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers the quantitative determination of
3、the 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 all of thesafe
4、ty 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:2D 4230 Test Method of Measuring
5、Humidity with Cooled-Surface Condensation (Dew-Point) HygrometerE 145 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), none- or two-compon
6、ent 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 more parts, w
7、hich 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 polymerized by expo-
8、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, nLow molecula
9、r 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 Use5.1 The qua
10、ntity 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 forType IIA in Sp
11、ecification E 145 with humidity control capa-bility. The oven should be capable of maintaining a tempera-ture of 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 temperature shall be
12、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 gases.6.2 Sa
13、mple 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.1This practice is under the jurisdiction ofASTM Committee F03 on Gaskets andis the direct res
14、ponsibility of Subcommittee F03.50 on Analytical Test Methods.Current edition approved Feb. 1, 2006. Published February 2006.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information,
15、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.6.3 BalanceAcalibrate weighing balance with a precisionto within 60.001 g.7. Preparation of Apparatus7.1 Maintain the hum
16、idity 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 according to Specification E 145. Theairflow in the oven should be 0.3 m3/min (10 ft3/min).7.3 Before test opera
17、tion, verify the relative humidity of theenvironmental chamber using a measurement device in accor-dance with Test Method D 4230.8. Procedure8.1 Dry the weighing vessel in the oven at 110 6 1C for30 min and cool to room temperature in a desiccator. Tare theweighing vessel to the nearest 0.001 g.8.2
18、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 dish in the humiditychamber controlled at 40 6 1C and 90 6 3 % relativehumidity.8.4 After 24 h, remove the w
19、eighing 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 the desiccator, andreweigh. Constant sample weight is reached when the succes-sive weighing differs by 0.001 g
20、 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 and average theresults.9. Calculation9.1 For each determination, calculate the weight percent ofvolatile matt
21、er by-products from FIPG as follows:% Volatile 5 M M!/M# 3 100 (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 following information:10.1.1 Percent volatile to the nearest 0.01 weight percent.11. Keywords11.1 by-products;
22、 curing process; FIPG; humidity chamber;silicone adhesives and sealants; volatile matterASTM 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
23、 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 technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn.
24、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 consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comme
25、nts 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 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).F2524062
