1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58hydraulic braking systems using a non-petroleum base hydraulic brake fluid (service temperature 70
2、C max.) ICS 43.040.40; 83.140.50Road vehicles Elastomeric cups and seals for cylinders for BRITISH STANDARDBS ISO 6118:2006BS ISO 6118:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2006 BSI 2006ISBN 0 580 48731 8request to its
3、 secretary.Cross-referencesThe British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or o
4、f British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises
5、a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 16, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizati
6、ons represented on this committee can be obtained on present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Nationa
7、l forewordThis British Standard reproduces verbatim ISO 6118:2006 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee PRI/69, Components and fluids for vehicle braking systems, which has the responsibility to: aid enquirers to u
8、nderstand the text;INTERNATIONALSTANDARDISO6118Second edition2006-07-15Reference numberISO 6118:2006(E)Road vehicles Elastomeric cups and seals for cylinders for hydraulic braking systems using a non-petroleum base hydraulic brake fluid (service temperature 70 C max.)Vhicules routiers Coupelles et j
9、oints en lastomre pour cylindres de systmes de freinage hydrauliques utilisant un liquide de frein base non ptrolire (temprature maximale dutilisation: 70 C)BS ISO 6118:2006iiiiiContents Page1 Scope 12 Normative references 13 Terms and definitions 14 General requirements 24.1 Workmanship and finish
10、. 24.2 Marking . 24.3 Packaging . 24.4 Sampling 25 Test requirements 25.1 Resistance to fluid at elevated temperature . 25.2 Precipitation . 25.3 Wheel cylinder seals heat pressure stroking . 25.4 Master cylinder seals heat pressure stroking 35.5 Low temperature performance . 45.6 Oven ageing . 45.7
11、 Corrosion . 55.8 Storage corrosion test 56 Test procedures . 56.1 Resistance to fluid at elevated temperature Dimensional test . 56.2 Precipitation test . 76.3 Wheel cylinder seals heat pressure stroking . 86.4 Master cylinder seals heat pressure stroking 106.5 Low temperature performance . 126.6 O
12、ven ageing . 136.7 Hardness determination . 136.8 Corrosion test 136.9 Storage corrosion test 15Bibliography . 16BS ISO 6118:2006ivForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies(ISO member bodies). The work of preparing Interna
13、tional Standards is normally carried out through ISOtechnical committees. Each member body interested in a subject for which a technical committee has beenestablished has the right to be represented on that committee. International organizations, governmental andnon-governmental, in liaison with ISO
14、, also take part in the work. ISO collaborates closely with the InternationalElectrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical commit
15、tees is to prepare International Standards. Draft International Standardsadopted by the technical committees are circulated to the member bodies for voting. Publication as anInternational Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possib
16、ility that some of the elements of this document may be the subject of patentrights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 6118 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 2, Brakingsystems and equipment.This second edit
17、ion cancels and replaces the first edition (ISO 6118:1980), which has been technically revised.BS ISO 6118:20061Road vehicles Elastomeric cups and seals for cylinders for hydraulic braking systems using a non-petroleum base hydraulic brake fluid (service temperature 70 C max.)1ScopeThis Internationa
18、l Standard specifies performance tests of brake cups and seals for hydraulic braking systemsfor road vehicles. It does not include requirements relating to chemical composition, tensile strength andelongation of the rubber compound. Disc brake seals are not covered by this International Standard.Thi
19、s International Standard is applicable to moulded seals (cups or double-lipped type gland seals), indiameter and smaller, compounded from rubber, for use in hydraulic actuating cylinders employing road vehiclenon-petroleum base hydraulic brake fluid conforming to the requirements of ISO 4925.NOTE Th
20、e rubber used in these seals shall be suitable for operation in a temperature range of to .2 Normative referencesThe following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition
21、of the referenced document(including any amendments) applies.ISO 48, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and100 IRHD)ISO 188:1998, Rubber, vulcanized or thermoplastic Accelerated ageing and heat resistance testsISO 4925, Road vehicles Specification
22、 of non-petroleum-base brake fluids for hydraulic systemsISO 4926, Road vehicles Hydraulic braking systems Non-petroleum base reference fluids3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1 sloughingrelease of carbon black on the surface of the
23、 rubber3.2 scoringformation of grooves in the rubber, parallel to the direction of travel of the piston or seal3.3 scuffingvisible erosion of the outer surface of the rubber60 mm40C +70CBS ISO 6118:200624 General requirements4.1 Workmanship and finishSeals shall be free from blisters, pin-holes, cra
24、cks, protuberances, embedded foreign material or other physicaldefects which can be detected by thorough inspection, and shall conform to the dimensions specified on thedrawings.4.2 MarkingThe identification mark of the manufacturer and other details as specified on drawings shall be moulded intoeac
25、h seal. Each seal in conformity with this International Standard may also have the following mark:“ISO 6118”.4.3 PackagingSeals shall be packaged to meet requirements specified by the purchaser.4.4 SamplingThe minimum lot on which complete specification tests shall be conducted for quality control t
26、esting, or thefrequency of any specific type test used to control production, shall be agreed upon by the manufacturer and thepurchaser.5 Test requirements5.1 Resistance to fluid at elevated temperatureAfter being subjected to the test for resistance to compatibility fluid at elevated temperature as
27、 prescribed in 6.1,the seals shall conform to the requirements specified in Table 1, and shall show no excessive disintegration asevidenced by blisters or sloughing.5.2 PrecipitationNot more than sediment by volume shall be formed in the centrifuge tube after the seals have been testedas specified i
28、n 6.2.5.3 Wheel cylinder seals heat pressure stroking5.3.1 GeneralWheel cylinder seals when tested by the procedure specified in 6.3 shall meet the performance requirementsspecified in 5.3.2 to 5.3.6.Table 1 Requirements for fluid resistance at elevated temperature ( )Characteristics Permitted chang
29、eVolume From to Outside diameter, lipFrom to Outside diameter, baseHardness From to 70C0,0 % +16,0 %0,0 % +5,75 %10 IRHD 0 IRHD0,3 %BS ISO 6118:200635.3.2 Lip diameter changeThe minimum lip diameter of wheel cylinder seals after the stroking test shall be greater than the wheel cylinderbore by the m
30、inimum dimensions specified in Table 2.5.3.3 LeakageNo constant dampness past the seals and no fluid discoloration of the filter paper on two or more inspectionsshall occur.5.3.4 CorrosionPistons and cylinder bore shall not show corrosion, as evidenced by pitting, to an extent discernible to the nak
31、edeye, but staining or discoloration shall be permitted.5.3.5 Change in hardnessRubber seals shall not decrease in hardness by more than when tested in accoprdance with theprocedure specified in 6.7.5.3.6 Condition of test sealsWheel cylinder seals shall not show excessive deterioration such as scor
32、ing, scuffing, blistering, cracking,chipping (heel abrasion) or change in shape from original appearance.5.4 Master cylinder seals heat pressure stroking5.4.1 GeneralMaster cylinder seals when tested by the procedure specified in 6.4 shall meet the performance requirementsspecified in 5.4.2 to 5.4.6
33、.5.4.2 Lip diameter changeThe minimum lip diameter of master cylinder seals after the stroking test shall be greater than the mastercylinder bore by the minimum dimensions specified in Table 3.Table 2 Lip diameter change of wheel cylinder sealsDimensions in millimetresDiameter of wheel cylinder bore
34、 Minimum excess over bore0,400,500,650,75lessorequalslant19,05 19,05lessorequalslant25,4 25,4lessorequalslant38,1 38,1lessorequalslant6010 IRHDBS ISO 6118:200645.4.3 LeakageSame requirement as specified for wheel cylinder seals shall be applied (see 5.3.3).5.4.4 CorrosionSame requirement as specifie
35、d for wheel cylinder seals shall be applied (see 5.3.4).5.4.5 Change in hardnessSame requirement as specified for wheel cylinder seals shall be applied (see 5.3.5).5.4.6 Condition of the test sealsSame requirement as specified for wheel cylinder seals shall be applied (see 5.3.6).5.5 Low temperature
36、 performance5.5.1 LeakageNo leakage of fluid shall occur when seals are tested according to the procedure specified in 6.5.1.5.5.2 Bend testThe seal shall not crack and shall return to its approximately original shape within when tested inaccordance with the procedure specified in 6.5.2.5.6 Oven age
37、ing5.6.1 GeneralSeals when tested according to the procedure specified in 6.6 shall meet the requirements specified in 5.6.2and 5.6.3.5.6.2 Change in hardnessThe change in hardness shall be within the limits of .5.6.3 Condition of the test sealsThe seal shall show no evidence of deterioration, or ch
38、ange in shape from original appearance.Table 3 Lip diameter change of master cylinder sealsDimensions in millimetresDiameter of wheel cylinder bore Minimum excess over bore0,300,400,500,65lessorequalslant19,05 19,05lessorequalslant25,4 25,4lessorequalslant38,1 38,1lessorequalslant601 min5 IRHDBS ISO
39、 6118:200655.7 Corrosion5.7.1 GeneralSeals when tested in accordance with the procedure specified in 6.8 shall meet the requirements specified in5.7.2 and 5.7.3.5.7.2 Corrosion of metal stripsThe seals shall not cause corrosion exceeding the limits shown in Table 4. The metal strips outside of the a
40、reawhere the strips are in contact shall be neither pitted nor roughened to the extent discernible to the naked eye,but staining or discoloration is permitted.5.7.3 Fluid-water mixture characteristicsThe fluid-water mixture at the end of the test shall show no gelling at . No crystalline-type deposi
41、tsshall form and adhere to either the glass wall or the surface of metal strips. The fluid-water mixture shall containno more than sediment by volume.5.8 Storage corrosion testAfter 12 cycles in the humidity cabinet when operated in accordance with the procedure specified 6.9, thereshall be no evide
42、nce of corrosion adhering to or penetrating the wall of the cylinder bore that was in contact withthe test seal.Slight discoloration (staining) or any corrosion or spots away from the contact surface of the test seals may bepermissible.6 Test procedures6.1 Resistance to fluid at elevated temperature
43、 Dimensional test6.1.1 Apparatus and materialThe following apparatus and material shall be used for the test.6.1.1.1 Micrometer, shadowgraph or other suitable apparatus, to measure accurately to .6.1.1.2 Glass container, of capacity approximately and diameter , which can be tightly sealed.6.1.1.3 Ch
44、emical balance, capable of weighing to .Table 4 Permissible change in mass of corrosion test stripsTest stripsPermissible change in massof surfaceTinned ironSteelAluminiumCast ironBrassCopperZincmg/cm20,20,20,10,20,40,40,423C 5C0,2 %0,02 mm250 ml 50 mm1mgBS ISO 6118:200666.1.1.4 Oven, uniformly heat
45、ed dry air type, conforming to the requirements for method B of ISO 188:1998.6.1.1.5 Two glass-stoppered weighing bottles, of adequate mouth size to hold the seals under test.6.1.1.6 Isopropyl or ethyl alcohol, of (by volume) reagent grade for washing purpose.6.1.2 Test specimensTwo seals shall be u
46、sed for testing at .6.1.3 Test procedureRinse the cups in the alcohol (6.1.1.6) and wipe dry with a clean, lint-free cloth to remove dirt and packingdebris. Do not leave the seals in the alcohol for more than .Measure the lip and base diameters to the nearest , taking the average of two readings at
47、right anglesto one another. Take care when measuring the diameters before and after ageing that the measurements aremade in the same manner and at the same locations.Determine and record the initial hardness of the test seals. (See 6.7 and Figure 3.)Determine the volume of each seal in the following
48、 manner: weigh the seals in air ( ) to the nearest and then weigh the seals immersed in distilled water at room temperature ( ). Quickly dip each specimen inalcohol and then blot dry with filter paper free of lint and foreign material.Immerse two seals completely in of compatibility reference fluid
49、as defined in ISO 4926, in theglass container (6.1.1.2) and seal the container to prevent vapour loss. Place the container in the oven (6.1.1.4)set at for a period of . At the end of the heating period, remove the container from theoven and allow the seals to cool in the container at for to . At the end of the coolingperiod, remove the seals from the container and rinse in the alcohol and wipe dry with a clean, lint-free cloth. Donot allow the seals to remain in the alcohol for m
