GB10830-1998标准（英文版）

GB 10830-1998ForewordWith the rapid development of road transport in our country, the quality level of brake fluid for use on motor vehicles has also been remarkably improved resulting in the obsolescence of fluid of low quality, and therefore it is essential to abolishing standards for brake fluid product of low quality. This standard will partially modify GB 10830-89 according to the requirements of GB/T 1.1-1993 and based on the current demands for safe running of motor vehicles. To consolidate the titles of GB7258-97, Specifications for Safe Running of Motor Vehicles, and ISO 4925, Motor vehicles -Non-Petroleum Base Brake Fluids, Automotive Brake Fluid is changed to Brake Fluid for Motor vehicles, and this Standard is re-entitled Specifications Of Using Motor Vehicle Brake Fluid; the contents regarding grades JG0,JG1 and JG2 are deleted due to low resistance to vapor lock at high temperature, low flow at low temperature and unsatisfactory quality of such products; the test on compatibility with rubber requires to use samples in compliance with GSBG 40001-1997, Standard Sample - EPT Brake Cup for Use on Automobiles, and with GSBG40002-1997, Standard Sample - SBR Brake Cup for Use on Automobiles; requirements for metal test plate for use in metallic corrosion test of brake fluid are more specific; procedures for test on compatibility with rubber and metallic corrosion test are separately handled in Appendix A and Appendix B to this Standard; according to GB/T15000.1 the requirements regarding describing the standard samples in Standard, the description of standard samples for automobile brake cup is handled in Appendix C. This Standard will replace GB 10830-89: Specifications Of Using Motor Vehicle Brake Fluid immediately after entering into force.This Standard provides the critical technical requirements for brake fluid from the perspective of ensuring safe running of motor vehicles. It also provides a guide to proper use of the product, the minimum requirements for manufacturers assuring product quality, as well as a technical basis on which the quality control and management of the industry rely. Therefore, the role of this Standard differs significantly from the brake fluid product standards.This Standard is jointly proposed by the Ministry of Communications and the Ministry of Public Security.This Standard is under the administration of Public Road Administration Department, Ministry of Communications.This Standard is drafted by Highway Scientific Research Institute under the Ministry of Communications.Draftpersons of this Standard: Guo Yiming, Liu Li, Yang Zheng, Wang Xunshi and Zhang Yang.- 200 -GB 10830-19981ScopeThis Standard provides the specifications for brake fluids intended for use in brake system of motor vehicles.This Standard is applicable to product delivery inspection, service test, random quality inspection and census survey.2Normative referencesThe following Standards contain provisions which through reference in this text, constitute provisions of this Standard. At the time of the publication, the editions indicated were valid. All standards are subject to revision, and parties using this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.GB/T 265-88Procedure for Determining Kinematic Viscosity of Petroleum ProductsHG 2865-1997Rubber Cup for Automotive Hydraulic BrakeSH 0164-92Rules for Packing, Storage, Transport and Delivery Acceptance Check of Petroleum ProductSH/T 0430-92Test Procedures for Equilibrium Reflux Boiling Point of Brake FluidASTM A 624Standard Specification for Tin Mill ProductsISO 301:1981 Zinc Alloy Ingots Intended For CastingISO 4925:1978Motor vehicles - Non-Petroleum Base Brake FluidSAE J 403Chemical Compositions of SAE Carbon SteelsSAE J 431Automotive Gray Iron CastingsSAE J 454General Data on Wrought Aluminum AlloysSAE J 461Wrought and Cast Copper Alloys3Terms and DefinitionsFor the purpose of this Standard, the terms and definitions given in the following apply.3.1Brake FluidA working medium used for transmitting pressure by hydraulic brake system of motor vehicle.3.2Wet Boiling PointThe equilibrium reflux boiling point of a brake fluid is measured in the sample of its fluid after humidified in a certain way.3.3JG SeriesJG series represent for the Ministries of Communications and Public Security series, where J is the initial phonetic alphabet of the first Chinese character of Jiaotongbu (the Ministry of Communications), and G is the initial phonetic alphabet of the first Chinese character of Gonganbu (the Ministry of Communications).3.4Standard SampleStandard samples are such that they have appropriately uniform chemical, physical, biological, engineering and/or perspective properties, have been technically appraised and are well documented.4Requirements4.1Specifications for JG series brake fluids for used on motor vehicles are classified as grades JG3, JG4 and JG5.4.2Table 1 lists the specifications of each grade of brake fluid.Table 1Specifications for Brake FluidItemsJG3JG4JG5Method of Test (Inspection)AppearanceClear and transparent, free of suspended matters, dust and deposited matters.Visual inspectionHigh temperature resistance to vapor lock Equilibrium reflux boiling point, (ERBP)not less than205230260SH/T 0430Wet Boiling Point, (ERBP)not less than140155180Chapter 5Kinematic Viscosity(mm2/s)-40not more than1,5001,800900GB/T 26550not less than42100not less than1.5Compatibility with rubberSRB and EPDM cups with respective root cylinder of 28mm28.25mm used in tests12070hAppearanceFree of gum, bubbling and carbon black freezing outVisual inspectionRate of change for root cylinder, %+0.1+5.0Appendix A(Appendix to this Standard)Hardness change0157070hAppearanceFree of gum, bubbling and carbon black freezing outVisual inspectionRate of change for root cylinder, %+0.1+5.0Appendix AHardness change010Metallic corrosion 100 for 120 hrsVariation of mass in metallic corrosion test, in mg/cm2Tin-coated sheet steel0.2Appendix B(Appendix to this Standard)SteelAluminum 0.1Cast iron0.2Brass 0.4Copper ZincAppearance of metallic test plateUniform color variation and free from pitsVisual inspectionSBR standard cup testCup appearanceFree of gum, bubbling and carbon black freezing outRate of change for root cylinder, %+0.1+5.0Appendix BpH value after test7.011.5Deposit, %(volume)not more than0.1pH values7.011.5Appendix B4.3In addition to the items specified as above, brake fluid product specific standards and test procedures shall respect the relevant national standards or industrial standards.4.4Key properties and recommended scope of application for various grades of brake fluids are shown in Table 2.Table 2: Key Properties and Recommended Scope of Application for Various Grades of Brake FluidsGrade Key PropertiesRecommended Scope of ApplicationJG3Good high-temperature vapor lock resistance and superior low temperature performance.Equivalent to ISO4925 and DOT31), and fit for use in all areas in China.JG4Good high-temperature vapor lock resistance and superior low temperature performance.Equivalent to DOT41), and fit for use in all areas in China.JG5Superior high-temperature vapor lock resistance and low temperature performances.Equivalent to DOT51), and fit for use on motor vehicles that have special requirements.1) DOT3, DOT4 and DOT5: DOT is the abbreviation of the Department of Transport, 3, 4 and 5 are read as the designations of brake fluids used in this Departments standards for motor vehicle brake fluids.5Test ProcedureProcedure for testing wet boiling point:Take 60 mL sample and place into a flask specially designed for use in test of equilibrium reflux boiling point, fill 2.1 mL distilled water and mix uniformly, determine the equilibrium reflux boiling point following the procedure specified in SH/T0430.6Packing, Labeling, Storage, Transport and Delivery Acceptance Check of ProductBrake fluid is a secure product intended for use on motor vehicles, which shall comply with SH 0164 in packing, labeling, storing, transport and delivery acceptance check of the product, and also be marked on the external packing with the number and title of the relevant standard(s) enforced and with the specifications of this product such as equilibrium reflux boiling point.Appendix A(Appendix to this Standard)Procedure for Compatibility Test of Motor vehicle Brake Fluid with RubberA1GeneralPut a national standard sample of automobile brake rubber cup referred to in Appendix C into brake fluid sample, soak to the specified test conditions, and test the compatibility of brake fluid with rubber by determining the root cylinder change rate (%), hardness change () and variation of cup appearance before and after test.A2Reagent or Material A2.1Alcohol, chemically pure (95%)A2.2National standard sample (hereinafter referred to as Cup)EPDM automobile brake Cup, GSBG 400011997SRB automobile brake Cup, GSBG 400021997A3DevicesA3.1Oven: inner temperature: 200A3.2Glass bottle: threaded mouth, cylinder shape, about 110 mm high, with an inner diameter of about 70 mm and volume of about 400 mL, made of heat resisting glass;A3.3Glass bottle cap: free of organic coating, made of tin coated sheet steel, drilled with an air vent of 0.80.1 mm diameter in the cap center;A3.4Optical reading microscope: range: 050.00 mm; accurate to 0.01 mm;A3.5Shore type A hardometer: 2division value.A4Preparations Take out 8 standard SBR and EPDM brake cup samples, each type 4, and rest them one by one on a table at room temperature for 24 hrs, then clean each cup with 95% alcohol for at most 30 seconds, then dry immediately with a piece of silk cloth and keep it standby.A5Test ProcedureAssign a number to each of 8 cups, measure the respective root cylinder and hardness according to procedures as specified in HG 2685, group the cups according to the rubber material type into 4 groups, each including 2 cups of the same rubber, and then put each group of cups into a glass bottle, fill the bottle with 75 mL brake fluid, and cover with the cap. Group these 4 bottles containing cups into 2 groups according to different rubber material type, place one group into a thermostatic oven (702 ) and keep 702 hours; and another group into a thermostatic oven (1202 ) and keep 702 hours. Upon the completion of test, cool each bottle at 235 for 60 to 90 minutes, then take out and clean each cup with 95% alcohol for at most 30 seconds, then dry immediately with a piece of silk cloth. Visually inspect the cups for gum, bubbling and carbon black freezing-out. Measure the root cylinder and hardness of each cup within 15 minutes.A6Calculation A6.1Calculate the root cylinder change rate in percentage by the following formula. Take the average value of the changes of root cylinders for each group of cups as the root cylinder change rate, which shall be accurate to 0.1%.Root cylinder change rate (%) A6.2Calculate the change of hardness by the following formula, and the result is expressed in absolute value. Take the average value of the changes of hardness for each group of cups as the change of hardness, which shall be accurate to 1.Change of hardness = hardness after test hardness before testA6.3Visually inspect the cups for gum, bubbling and carbon black freezing-out.A6.4Remove the abnormal value if any before calculating the average.Appendix B(Appendix to this Standard)Metallic corrosion Test Procedure for Motor vehicle Brake FluidB1GeneralPut 7 special metallic test plates into brake fluid sample, soak at specified temperature and for a specified period of time, identify the metallic corrosion of brake fluid by determining the surface corrosions and mass variations of metal plates before and after test.B2MaterialsB2.1Distilled waterB2.2Alcohol, chemically pure (95%)B2.3Potassium acid phthalate: reference reagentB2.4National standard sample: SRB automobile brake Cup, GSBG 400021997B2.5Metallic test plate: 2 sets, see Table 3 for their technical requirements.Table 3 Technical Requirements for Metallic Test PlateDescription Tin-coated sheet steelSteelAluminum Cast ironBrass Copper Zinc Standard NumberASTMA 624SAE J403SAE J454SAE J431SAE J461SAE J461ISO 301Material DesignationNo25101820243000CA 260CA 114Dimensions (mm)length80808080808080width13131313131313thickness0.352.532.532.532.532.532.53Mis. requirementsDrill a 45mm hole at the center 6 mm from one end.Note: The test plates aforementioned are provided by Highway Scientific Research Institute under the Ministry of Communications.B2.5Wateproof emery paper: 320A and 400AB3DevicesB3.1Oven: inner temperature: 200;B3.2Glass bottle: threaded mouth, cylinder shape, about 120 mm high, with an inner diameter of about 68 mm and volume of about 450 mL, made of heat resisting glass;B3.3Glass bottle cap: free of organic coating, made of tin coated sheet steel, drilled with an air vent of 0.80.1 mm diameter in the cap center;B3.4Bolt, nut and spacer: no plating (L=50mm,45mm);B3.5Drier: 300;B3.6Balance: sensibility reciprocal is 0.1 mg;B3.7Optical reading microscope: range: 050.00 mm; accurate to 0.01 mm;B3.8Acidimeter: range: 014; accurate to 0.1; B3.9Centrifugal machine: speed: 03,000 rmp;B3.10Centrifugal test tube: 100 mL, fully protected cone shaped tube; B3.11graduated flask: 25 mL, 500 mL.B4Preparations B4.1Take 2 sets of metallic test plates, polish off the scratches and pits on surface of these plates with a sheet of A320 waterproof emery paper. New emery paper is required for each metallic plate of different type. Polishing of tin coated sheet steel plate is not necessarily required. Then clean all plates with 95% alcohol, and wipe dry with a piece of clean silk cloth, and keep the plates in an oven at 235 for at 1 hour. Note: After prepared, handle the plates with a pair of tweezers in rather with than fingers directly to avoid contamination by finger print.B4.2Get 2 SBR cups prepared following the procedure as specified in A4 of Appendix A.B5Test ProcedureB5.1Weigh the plates to 0.1 mg, then assemble each set of plates in a sequence of tin coated sheet steel, steel, aluminum, cast iron, brass, copper and zinc with plating free bolt and nut, and between plates spacer shall be used to allow electrolytic contact. Dip the plate group with a pair of clean tweezers into 95% alcohol to eliminate oily dirt contaminated from fingers.B5.2Measure the root cylinders of 2 SBR cups following the procedure defined in HG2865.B5.3Conduct in parallel tests on 2 groups of test plate and cup on same conditions, each group containing one plate and one cup. B5.4Put the cup into a glass bottle with concave upward, then rest the fixed end of metallic plate group on the concave of cup, with the free end of the group upward. Mix 285 mL brake fluid with 15 mL distilled water, fill the mixture into glass bottle to have the liquid level 10mm higher than plate, cover the bottle with its cap and put it into an 1002 oven, keep 1002 hours.B5.5Take out the bottle and have it cooled at a temperature of 235 for 60 to 90 minutes, hold the plate with a pair of tweezers and slightly shake in the liquid to have the possible loose deposits removed, then take out the plate and observe the crystalline deposits that adhered to plate and bottle wall, disassemble the plate, rinse away the solution remaining on plate surface and wipe off the plates one by one with a piece of silk cloth tipping with 95% alcohol, visually inspect the surface for erosion signs and pits, then put the plates into a 235 oven for at least 1 hour and accurately weigh each plate to 0.1 mg.B5.6When the glass bottle is cool, take out the cup and measure its root cylinder according to the procedure specified in A4 of Appendix A; visually inspect the gum of sample in the bottle; stir the sample in tottle to allow deposits to suspend uniformly; take out 240 mL sample and respectively put into two 100 mL centrifugal tube to centrifuge 10 mm on high speed centrifugal machine, the take out the centrifugal tube and read the volume of solid deposits. B5.7Prepare a solution of 80% alcohol and 20% distilled water, and have the solution mixed with brake fluid sample of equivalent volume; under the condition of （23+2）,prepare standard pH value buffer solution with potassium acid phthalate,