1、Designation: F 677 04An American National StandardStandard Test Method forFluid and Grease Resistance of Thermoset EncapsulatingCompounds Used in Electronic and MicroelectronicApplications1This standard is issued under the fixed designation F 677; the number immediately following the designation ind
2、icates 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method determines the resistan
3、ce of encapsu-lating compounds to fluids or greases by measuring changes inweight (Note 1) and volume under defined conditions of timeand temperature.NOTE 1To provide consistency with the usage in other ASTM testmethods concerned with determining the properties of plastic materials,the terms “weight
4、” and “weigh” are used in this test method although theunits of measurement are those of mass.1.2 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 pra
5、ctices and determine the applica-bility of regulatory limitations prior to use. See 9.1.1.3 The values stated in SI units are standard. The values inparentheses are for information only.NOTE 2There is no similar or equivalent IEC standard.2. Referenced Documents2.1 ASTM Standards:2D 1193 Specificati
6、on for Reagent WaterD 1711 Terminology Relating to Electrical InsulationD 5423 Specification for Forced-Convection LaboratoryOvens for Evaluation of Electrical InsulationD 6054 Practice for Conditioning Electrical Insulating Ma-terials for Testing3. Terminology3.1 Definitions:3.1.1 For the definitio
7、ns of terms used in this standard, referto Terminology D 1711.4. Summary of Test Method4.1 Specimens of encapsulating compound are immersed influids or greases for specified conditions of temperature andtime. The weight and volume of each specimen is measuredbefore and after immersion and percent ch
8、ange is reported.4.2 The fluids and greases to be used as test media (8.3) arenot specified by the test method and shall be agreed to by theparties to the test.5. Significance and Use5.1 Fluids and greases in contact with encapsulating com-pounds may adversely modify the encapsulant properties withr
9、esulting damage or loss of protection to components inelectronic applications.5.2 This test method provides a means for measuring theeffect of fluids and greases on various encapsulants.5.3 This test method is intended for use in research andevaluation.6. Interferences6.1 Test results obtained with
10、molded or cast specimens offilled encapsulating compounds will differ from those obtainedwith cut or machined specimens (because of exposed fillers inthe latter).6.2 Lack of complete contact between the test medium andthe surfaces of the specimen may seriously affect the results ofthe test.6.3 Some
11、encapsulants may be affected by the reagentsspecified for use in removing the test media from the speci-mens. Alternative reagents may be required, as agreed upon bythe parties to the test.7. Apparatus7.1 Analytical Balance, capable of determining weight tothe nearest 0.001 g.7.2 Oven, forced-convec
12、tion type meeting the requirementsof Specification D 5423, Type I.1This test method is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.01 on Electrical Insulating Varnishes, Powders, and Encapsu-lating
13、Compounds.Current edition approved March 1, 2004. Published March 2004. Originallyapproved in 1980. Discontinued 1991 and reinstated as F 677 95. Last previousedition approved in 1999 as F 677 95(1999).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Serv
14、ice 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 Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.3 Glass Dishes, of sufficient diameter for
15、 specimens to beexposed horizontally, and of sufficient height for specimens tobe completely covered by the test medium. A loose-fitting glasscover shall be provided for each dish (see 13.3).8. Reagents and Materials8.1 Use the following materials:8.1.1 Acetone.8.1.2 Distilled WaterType III Reagent
16、Water as defined inSpecification D 1193.8.1.3 Isopropyl Alcohol.8.2 Filter Paper, medium retention and medium filteringspeed, free of lint or foreign material.8.3 Test Mediaagreed-upon fluids or greases.9. Safety Precautions9.1 Some encapsulating compounds are known to containtoxic components, and s
17、pecial precautions are required inhandling. Follow manufacturers precautionary instructionsand sound laboratory safety practices.10. Sampling10.1 Because of the diverse nature of the encapsulatingcompounds, and the various forms and packages of resin,hardeners, catalysts, etc. commercially available
18、, no standardmethods of sampling have been established. Select an adequateamount of material, representative of each ingredient fromeach lot to permit preparation of specimens as agreed upon bythe parties to the test.11. Test Specimen11.1 Prepare three specimens of each encapsulating com-pound to be
19、 tested, in accordance with generally acceptedpractices.11.1.1 Each specimen shall be a disk 51 6 2.5 mm (2 6 0.1in.) diameter and 3 6 0.30 mm (0.125 6 0.01 in.) in thickness(see 6.1). Surface finish of machined specimens shall be 64maximum.12. Conditioning12.1 Unless otherwise specified, condition
20、all specimens for40 h at Standard Laboratory Atmosphere in accordance withProcedure A of Practice D 6054.13. Procedure13.1 Weigh each specimen in air to the nearest 0.001 g andrecord value as W1. Weigh each specimen while immersed indistilled water at room temperature and record the value as W2.Quic
21、kly dip each specimen in isopropyl alcohol to removewater, blot dry with filter paper, and place in glass dish (7.3).13.2 Stack all three specimens of a single composition in thesame glass dish.13.2.1 For fluid test media, insert the filter paper into thedish, cover it with fluid, then add a specime
22、n and cover it withfluid. Repeat this procedure to form a sandwich structure ofalternating filter paper and specimen layers.13.2.2 For grease test media, omit the filter paper if theviscosity of the grease at the exposure temperature is sufficientto prevent specimens from touching. Apply grease to a
23、llexposed surfaces of the specimens and insert coated specimensinto the dish to form a sandwich structure of alternating greaseand specimen layers.13.3 Cover the assembled test specimens with a loose-fittingglass cover and expose the assembled test specimens in anoven at 71 6 3C (160 6 5.4F) for a t
24、otal duration of 14 days.13.4 Remove the specimens from the oven for measurementand observation after cumulative exposure times of 24 6 2h(1day), 168 6 2 h (7 days), and 336 6 2 h (14 days).13.4.1 Remove the assembled test specimens from the ovenand allow them to cool to room temperature for 30 to 6
25、0 min,before conducting measurements and observations as follows:13.4.1.1 Remove specimens one at a time from the testmedium, saving the test medium in the glass dish or otherconvenient noncontaminating vessel. Remove (and save) high-viscosity fluids and greases from the specimen with a spatula.Wipe
26、 with a lint-free filter paper before dipping the specimenin acetone.13.4.1.2 Dip each specimen quickly into acetone to removethe remaining test medium and blot with filter paper (see 6.3).13.4.1.3 Within 1 min after removing the specimen from thetest medium, weigh the specimen in air to the nearest
27、 0.001 gand record the value as W3.13.4.1.4 Immerse each specimen in distilled water, andwithin 1 min after the determination in air, weigh eachspecimen while immersed, to the nearest 0.001 g; record thevalue as W4.13.4.1.5 Dip each specimen in isopropyl alcohol to removethe water after the weight i
28、n water (W4) has been determined.Then blot the specimen with filter paper.13.4.1.6 Visually examine each set of specimens and theassociated test media from a single glass dish. Record thecondition of the specimens and media. Note characteristicssuch as color change, cracking, swelling, shrinking, su
29、rfacechange, tackiness, etc.13.4.1.7 When the test is to be continued, replace thespecimen in the glass dish, and cover the specimen with thesame test medium saved in 13.4.1.1. Reform the sandwichstructure described in 13.2. If there is insufficient test mediumto cover the specimens, add additional
30、medium.14. Calculation14.1 Calculate the change in weight as follows:Change in weight, % 5W32 W1W13 100 (1)where:W1= initial weight of specimen in air, mg, andW2= weight of specimen in air after immersion, mg.14.2 Calculate change in volume as follows:Change in volume, % 5W32 W4! 2 W12 W2!W12 W2!3 1
31、00 (2)where:W3= initial weight of specimen in water, mg, andW4= weight of specimen in water after immersion, mg.F 677 04215. Report15.1 Report the following information:15.1.1 Identification of encapsulating compound,15.1.2 Identification of test media used,15.1.3 Temperature and total duration of t
32、est exposure,15.1.4 Description of the specimen surface preparation(examples, molded, cut or machined), and15.1.5 After each exposure period:15.1.5.1 Change in weight, percent, for each specimen,15.1.5.2 Average change in weight, percent, for each encap-sulating compound,15.1.5.3 Change in volume, p
33、ercent, for each specimen,15.1.5.4 Average change in volume, percent, for each en-capsulating compound, and15.1.5.5 Description of condition of specimens and testmedia as determined by visual examinations and recorded in13.4.1.6.16. Precision and Bias16.1 Precision:16.1.1 An interlaboratory study wa
34、s conducted in whichfive laboratories tested two encapsulating compounds in twotest media for each compound.16.1.2 The data have been analyzed to express precision interms of standard deviations. The data are given in Table 1.16.2 BiasThis test method has no bias since the value forfluid and grease
35、resistance is defined in terms of this testmethod.17. Keywords17.1 electronic; encapsulating compound; grease;microelectronicsF 677 043ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this stand
36、ard 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 technical committee and must be reviewed every five years andi
37、f 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 consideration at a meeting of theresponsible technical committee, wh
38、ich 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 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,
39、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).TABLE 1 Interlaboratory Test DataSystem/Medium AveragePrecision, % AbsoluteWithin Laboratory,SwBetween Laboratory,SbChange in WeightIa 49.3 3.69 5.11Ib 4.35 0.70 3.47IIa 0.27 0.17 0.39IIb 0.09 0.17 0.65Change in VolumeIa 51.32 3.67 5.44Ib 4.73 0.75 3.73IIa 0.48 0.22 0.33IIb 0.45 0.36 0.87F 677 044
