1、Designation: D 5282 05Standard Test Methods forCompatibility of Construction Material with Silicone FluidUsed for Electrical Insulation1This standard is issued under the fixed designation D 5282; the number immediately following the designation indicates the year oforiginal adoption or, in the case
2、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 These test methods cover screening for the compatibilityof construction materials with silic
3、one fluid for use in electricalequipment.1.2 The values stated in SI units are to be regarded as thestandard.1.3 This standard does not purport to address all of thesafety problems, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety
4、 and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D92 Test Method for Flash and Fire Points by ClevelandOpen CupD 445 Test Method for Kinematic Viscosity of Transparentand Opaque LiquidsD 664 Test Method forAcid N
5、umber of Petroleum Productsby Potentiometric TitrationD 828 Test Method for Tensile Properties of Paper andPressboard Using Constant-Rate-of-Elongation ApparatusD 877 Test Method for Dielectric Breakdown Voltage ofInsulating Liquids Using Disk ElectrodesD 924 Test Method for Dissipation Factor (or P
6、ower Factor)and Relative Permittivity (Dielectric Constant) of Electri-cal Insulating LiquidsD 974 Test Method for Acid and Base Number by Color-Indicator TitrationD 1169 Test Method for Specific Resistance (Resistivity) ofElectrical Insulating LiquidsD 1933 Specification for Nitrogen Gas as an Elec
7、tricalInsulating MaterialD 2129 Test Method for Color of Clear Electrical InsulatingLiquids (Platinum-Cobalt Scale)D 2225 Test Methods for Silicone Fluids Used for ElectricalInsulationD 2413 Practice for Preparation of Insulating Paper andBoard Impregnated with a Liquid DielectricD 3612 Test Method
8、for Analysis of Gases Dissolved inElectrical Insulating Oil by Gas ChromatographyD 4243 Test Method for Measurement of Average Visco-metric Degree of Polymerization of New and Aged Elec-trical Papers and BoardsD 4559 Test Method for Volatile Matter in Silicone FluidD 4652 Specification for Silicone
9、Fluid Used for ElectricalInsulationD 5837 Test Method for Furanic Compounds in ElectricalInsulating Liquids by High-Performance Liquid3. Significance and Use3.1 The magnitude of the changes in the electrical propertiesof the silicone fluid is of importance in determining thecontamination of the flui
10、d by the test specimen.3.2 Physical and chemical changes in the fluid, such as colorand acidity, also indicate solubility or other adverse effects ofthe test specimen on the fluid.3.3 Physical changes of the test specimen, such as hardness,swelling, and discoloration, show the effect of the fluid on
11、 thetest specimen and are used to determine the suitability of thematerial for use in silicone fluid.3.4 A material meeting the criteria recommended does notnecessarily indicate suitability for use in electrical equipment.Other properties must also be considered. Additionally, certain1These test met
12、hods are under the jurisdiction of ASTM Committee D27 onElectrical Insulating Liquids and Gases and are the direct responsibility ofSubcommittee D27.06 on Chemical Test.Current edition approved Oct. 1, 2005. Published October 2005. Originallyapproved in 1992. Last previous edition approved in 1998 a
13、s D 5282 98.2For 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.1Copyright ASTM International, 100 Barr Harbor Dr
14、ive, PO Box C700, West Conshohocken, PA 19428-2959, United States.materials containing additives may meet the requirements ofthese test methods yet be unsatisfactory when subjected tolonger-term evaluations.3.5 These test methods may be used as a guide for testingthe compatibility of materials for s
15、ilicone fluids other than 50cSt poly-dimethyl siloxane fluid, but different criteria forjudgment may be necessary.4. Apparatus4.1 Sample-Handling Apparatus:4.1.1 Oven, forced draft, adjustable to 120 6 1C, and adrying oven, adjustable to 105 6 5C.4.1.2 Glass Containers, 1-L, fitted with glass or alu
16、minumfoil covers (Note 1).NOTE 1Other materials have been found to be suitable as covers.4.1.3 Fritted Glass Dispersion Tube (coarse).4.2 Sample-Testing Apparatus:4.2.1 Tensile StrengthAs specified in appropriate testmethod.4.2.2 HardnessAs specified in appropriate test method.4.2.3 Dimensional Chan
17、geMicrometer and caliper.4.2.4 Weight ChangeAnalytical balance.5. Reagents5.1 Dry Nitrogen Gas, Meeting the requirements of Speci-fication D 1933, Type III with the following exception: thetotal hydrocarbon content must by 0.5 ppm. Sometimesreferred to as Ultra-High Purity (UHP).5.2 Dimethyl Silicon
18、e Fluid (50 CSt), conforming to Speci-fication D 4652.6. Preparation of Test Specimen6.1 Test specimen size shall be such that the ratio of surfacearea to liquid volume is four times as large as the ratioencountered in normal use in electrical equipment unless thereis some special reason for using a
19、 different ratio (Note 2).Some suggested ratios are as follows:6.1.1 If the test specimen can be measured, no less than 52cm2is used with each 800 mL of silicone.6.1.2 If the test specimen is insoluble in silicone fluid andthe surface area cannot be measured, use a test specimen in theamount of 1 %
20、by weight of the silicone.6.1.3 If the material is soluble in the silicone fluid, use a testspecimen in the amount of 0.5 % by weight of the siliconefluid.6.1.4 When surface areas are employed for solid materialtesting, all sides of the solid material are to be used in thecalculation of surface area
21、 as long as that surface is in contactwith the silicone fluid.6.1.5 Varnishes and materials used as dip coatings, andpaints shall be cured on aluminum foil or paper known to becompatible with the silicone fluid. They should be tested at aratio of 14 g or approximately 1300 cm2of surface area per 800
22、mL of silicone fluid.6.1.6 Core steel and core-steel coatings shall be tested at aratio of 3100 cm2for each 400 mL of silicone fluid fortransformer applications. A realistic core steel ratio for regu-lators is 5000 cm2of surface area per each 400 mL of siliconefluid.6.1.7 Gasket materials shall be t
23、ested at a ratio of 13 cm2ofsurface area per 800 mL of silicone fluid.6.1.8 Wire enamels shall be tested at a ratio of 1300 cm2ofsurface area per 800 mL of silicone fluid.6.1.9 Cellulosic insulation shall be tested at a ratio 2000 cm2of surface area per 800 mL of silicone fluid. These testspecimens
24、shall be prepared according to the instructionsprovided in Practice D 2413.6.2 Caution must be taken in obtaining and preparing thesample to ensure that it is a representative sample of thematerial as supplied by the manufacturer. Use forceps to handlethe test specimens or adequately protect them fr
25、om contami-nation such as skin oils during handling.6.3 Pre-dry all solid materials for 16 h in an oven at 105 65C. Gasket materials shall not be pre-dried and cellulosicinsulation does not require any further drying as long as it isprepared according to 6.1.9.6.4 Remove the test specimen from the o
26、ven and place in a1-L jar with 800 mL of silicone fluid. Bubble the silicone fluidwith dry nitrogen for approximately 10 min through a frittedglass tube. To minimize contamination, slide the cover onquickly while removing the aluminum foil and the bubble tube.Fasten the cover tightly.NOTE 2There are
27、 certain materials in electrical apparatus for whichthe suggested ratios of material to liquid are impractical; when thiscondition exists, report the ratio.6.5 Prepare a reference silicone fluid specimen (control) foreach group of specimens tested, as directed in 6.4. A referencespecimen consists of
28、 the silicone fluid only.7. Conditioning7.1 Place the covered glass jars in an oven at 1206 1C for168 h.7.2 Remove the jars from the oven and cool to roomtemperature.8. Procedure8.1 With a pair of clean tongs or forceps, remove the testspecimen from the fluid, observe the condition, and conductany d
29、esired test on the material.8.1.1 Typical tests on materials can include swelling ordimensional changes, weight changes, hardness, discoloration,brittleness, tensile strength (Test Method D 828), degree ofpolymerization (Test Method D 4243), etc.8.1.2 For comparative tests, use the appropriate metho
30、d.8.2 The following tests, as modified in Test Method D 2225,are suggested for the properties listed below:8.2.1 Fire PointTest Method D92.8.2.2 ViscosityTest Method D 445.8.2.3 Neutralization NumberTest Methods D 664 orD 974.8.2.4 Dielectric StrengthTest Method D 877.D 5282 0528.2.5 Dissipation Fac
31、tor (Power Factor at 25 and 100C)Test Method D 924.8.2.6 ColorTest Method D 2129.8.2.7 Resistivity Test Method D 1169.8.2.8 Percent VolatilesTest Method D 4559.8.2.9 Furanic Compounds (perform when testing cellulosicmaterials)Test Method D 5837.8.2.10 Dissolved Gases-in-Silicone (optional)TestMethod
32、 D 3612.9. Evaluation of Results9.1 Evaluation of Physical Changes of the Material at RoomTemperatureThe changes in physical properties of the ma-terial being tested must be considered on the basis of thespecific needs of the application. For example, paper insulationtested may be submitted for degr
33、ee of polymerization analysis(Test Method D 4243) or tensile strength (Test Method D 828).9.2 Evaluation of Test Results on Silicone Fluid:9.2.1 The test results obtained on the liquids containing thetest specimens of construction material must be compared withthose of the reference liquid sample to
34、 determine any variation.9.2.2 The absence of any differences between the testspecimen fluid and the reference fluid indicates that the testspecimen fluid was not affected by the material and that thematerial is worthy of further consideration or testing, or both.9.2.3 Asignificant difference in any
35、 of the results, as definedin 9.2.5, may indicate some compatibility problem, and thematerial should be either further reviewed or rejected.9.2.3.1 The amount of change between the reference fluidand the test specimen fluid that is considered to be significantshould be established prior to testing b
36、y agreement between thepurchaser and the seller.9.2.4 If the aged control fluid reference fails to meet thecriteria in 9.2.5, the liquid itself is suspect for one or more ofthe following reasons:9.2.4.1 The fluid does not meet the requirements for ap-proved silicone.9.2.4.2 The fluid has become cont
37、aminated.9.2.4.3 The test aging temperature exceeded the prescribedlimit (see 7.1).9.2.5 The aged properties for the control 50 cSt dimethylsilicone fluid specimen should be as follows:Fire point 340C, minViscosity 47.5 to 52.5 cStNeutralization number 0.04, maxDielectric strength 38 kV, minDissipat
38、ion factor (Power factor), 100C 0.35 %, maxColor 100, maxResistivity, 100C 10 3 1012,minPercent volatiles 0.5 %, maxCondition of silicone clearCondition of material unchanged10. Report10.1 Report the following information:10.1.1 The results of the tests specified in 9.2.5, on both thereference silic
39、one specimen and the test specimen silicone,10.1.2 Any changes in appearance, dimensions, hardness orother relevant properties of the construction material testspecimens, and10.1.3 Whether the construction material evaluated by thistest method appears to be compatible (or incompatible) withsilicone
40、fluid.11. Precision and Bias11.1 No practical means exists to specify precision and bias,as this method is used to test materials which may agedifferently in the presence of silicone fluid.11.2 Refer to the precision and bias statements for each ofthe individual test methods used for comparative tes
41、ts in 8.1.2and the suggested tests in 8.2.12. Keywords12.1 compatibility; construction material; electrical equip-ment; electrical insulating liquid; poly-dimethyl siloxane; sili-cone fluidASTM International takes no position respecting the validity of any patent rights asserted in connection with a
42、ny 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 technica
43、l 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 consideration
44、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 Barr Harbor
45、 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).D 5282 053
