1、Designation: F677 04 (Reapproved 2009)An American National StandardStandard Test Method forFluid and Grease Resistance of Thermoset EncapsulatingCompounds Used in Electronic and MicroelectronicApplications1This standard is issued under the fixed designation F677; the number immediately following the
2、 designation indicates the year of originaladoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method determin
3、es the resistance 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,th
4、e terms “weight” 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
5、 and health practices 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:2D11
6、93 Specification for Reagent WaterD1711 Terminology Relating to Electrical InsulationD5423 Specification for Forced-Convection LaboratoryOvens for Evaluation of Electrical InsulationD6054 Practice for Conditioning Electrical Insulating Ma-terials for Testing3. Terminology3.1 Definitions:3.1.1 For th
7、e definitions of terms used in this standard, referto Terminology D1711.4. 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
8、percent change 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 proper
9、ties withresulting 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 obta
10、ined with 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
11、.6.3 Some 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, for
12、ced-convection type meeting the requirementsof Specification D5423, 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
13、lat-ing Compounds.Current edition approved Oct. 1, 2009. Published February 2010. Originallyapproved in 1980. Last previous edition approved in 2004 as F677 04. DOI:10.1520/F0677-04R09.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceast
14、m.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 specimens to bee
15、xposed horizontally, and of sufficient height for specimens tobe completely covered by the test medium.Aloose-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 Water as defined in
16、Specification D1193.8.1.3 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 special precautions a
17、re 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, no standardmethods
18、 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 tested, in accordan
19、ce 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 all specimens for40
20、h at Standard Laboratory Atmosphere in accordance withProcedure A of Practice D6054.13. 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.Quickly dip each specimen
21、 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 specimen and cover it withfl
22、uid. 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 allexposed surfaces of
23、 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 total duration of 14 d
24、ays.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 60 min,before conducti
25、ng 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 with a lint-free fil
26、ter 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 0.001 gand record th
27、e 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 in water (W4) has been
28、 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, surfacechange, tackines
29、s, 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 medium.14. Calculatio
30、n14.1 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!3 100 (2)where:W3= initi
31、al weight of specimen in water, mg, andW4= weight of specimen in water after immersion, mg.F677 04 (2009)215. 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 test exposure,15
32、.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, percent, for eac
33、h 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 was conducted in
34、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 resistance is d
35、efined in terms of this testmethod.17. Keywords17.1 electronic; encapsulating compound; grease;microelectronicsASTM 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 advise
36、d 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 andif not revised, either re
37、approved 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, which you may attend. If y
38、ou 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,United States. Individua
39、l 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
40、the ASTM website (www.astm.org/COPYRIGHT/).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 0.87F677 04 (2009)3
