1、BRITISH STANDARD BS ISO 6118:2006 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.) ICS 43.040.40; 83.140.50 BS ISO 6118:2006 This British Standard was published under the authority of
2、 the Standards Policy and Strategy Committee on 31 August 2006 BSI 2006 ISBN 0 580 48731 8 National foreword This 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, Com
3、ponents and fluids for vehicle braking systems, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be fo
4、und in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are res
5、ponsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep
6、 UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises 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 no
7、tice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsINTERNATIONAL STANDARD ISO 6118 Second edition 2006-07-15 Reference number ISO 6118:2006(E) Road vehicles Elastomeric cups and seals for cylinders for hydraulic brak
8、ing systems using a non-petroleum base hydraulic brake fluid (service temperature 70 C max.) Vhicules routiers Coupelles et joints en lastomre pour cylindres de systmes de freinage hydrauliques utilisant un liquide de frein base non ptrolire (temprature maximale dutilisation: 70 C)BS ISO 6118:2006ii
9、 iii Contents Page 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 General requirements 2 4.1 Workmanship and finish . 2 4.2 Marking . 2 4.3 Packaging . 2 4.4 Sampling 2 5 Test requirements 2 5.1 Resistance to fluid at elevated temperature . 2 5.2 Precipitation . 2 5.3 Wheel cylinder
10、seals heat pressure stroking . 2 5.4 Master cylinder seals heat pressure stroking 3 5.5 Low temperature performance . 4 5.6 Oven ageing . 4 5.7 Corrosion . 5 5.8 Storage corrosion test 5 6 Test procedures . 5 6.1 Resistance to fluid at elevated temperature Dimensional test . 5 6.2 Precipitation test
11、 . 7 6.3 Wheel cylinder seals heat pressure stroking . 8 6.4 Master cylinder seals heat pressure stroking 10 6.5 Low temperature performance . 12 6.6 Oven ageing . 13 6.7 Hardness determination . 13 6.8 Corrosion test 13 6.9 Storage corrosion test 15 Bibliography . 16 BS ISO 6118:2006iv Foreword ISO
12、 (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical com
13、mittee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrot
14、echnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the mem
15、ber bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identify
16、ing any or all such patent rights. ISO 6118 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 2, Braking systems and equipment. This second edition cancels and replaces the first edition (ISO 6118:1980), which has been technically revised. BS ISO 6118:20061 Road vehicles
17、Elastomeric cups and seals for cylinders for hydraulic braking systems using a non-petroleum base hydraulic brake fluid (service temperature 70 C max.) 1S c o p e This International Standard specifies performance tests of brake cups and seals for hydraulic braking systems for road vehicles. It does
18、not include requirements relating to chemical composition, tensile strength and elongation of the rubber compound. Disc brake seals are not covered by this International Standard. This International Standard is applicable to moulded seals (cups or double-lipped type gland seals), in diameter and sma
19、ller, compounded from rubber, for use in hydraulic actuating cylinders employing road vehicle non-petroleum base hydraulic brake fluid conforming to the requirements of ISO 4925. NOTE The rubber used in these seals shall be suitable for operation in a temperature range of to . 2 Normative references
20、 The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 48, Rubber, vulcanized or thermoplastic Dete
21、rmination of hardness (hardness between 10 IRHD and 100 IRHD) ISO 188:1998, Rubber, vulcanized or thermoplastic Accelerated ageing and heat resistance tests ISO 4925, Road vehicles Specification of non-petroleum-base brake fluids for hydraulic systems ISO 4926, Road vehicles Hydraulic braking system
22、s Non-petroleum base reference fluids 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 sloughing release of carbon black on the surface of the rubber 3.2 scoring formation of grooves in the rubber, parallel to the direction of travel of the pi
23、ston or seal 3.3 scuffing visible erosion of the outer surface of the rubber 60 mm 40 C +70 C BS ISO 6118:20062 4 General requirements 4.1 Workmanship and finish Seals shall be free from blisters, pin-holes, cracks, protuberances, embedded foreign material or other physical defects which can be dete
24、cted by thorough inspection, and shall conform to the dimensions specified on the drawings. 4.2 Marking The identification mark of the manufacturer and other details as specified on drawings shall be moulded into each seal. Each seal in conformity with this International Standard may also have the f
25、ollowing mark: “ISO 6118”. 4.3 Packaging Seals shall be packaged to meet requirements specified by the purchaser. 4.4 Sampling The minimum lot on which complete specification tests shall be conducted for quality control testing, or the frequency of any specific type test used to control production,
26、shall be agreed upon by the manufacturer and the purchaser. 5 Test requirements 5.1 Resistance to fluid at elevated temperature After being subjected to the test for resistance to compatibility fluid at elevated temperature as prescribed in 6.1, the seals shall conform to the requirements specified
27、in Table 1, and shall show no excessive disintegration as evidenced by blisters or sloughing. 5.2 Precipitation Not more than sediment by volume shall be formed in the centrifuge tube after the seals have been tested as specified in 6.2. 5.3 Wheel cylinder seals heat pressure stroking 5.3.1 General
28、Wheel cylinder seals when tested by the procedure specified in 6.3 shall meet the performance requirements specified in 5.3.2 to 5.3.6. Table 1 Requirements for fluid resistance at elevated temperature ( ) Characteristics Permitted change Volume From to Outside diameter, lip From to Outside diameter
29、, base Hardness From to 70 C 0,0 % +16,0 % 0,0 % +5,75 % 10 IRHD 0 IRHD 0,3 % BS ISO 6118:20063 5.3.2 Lip diameter change The minimum lip diameter of wheel cylinder seals after the stroking test shall be greater than the wheel cylinder bore by the minimum dimensions specified in Table 2. 5.3.3 Leaka
30、ge No constant dampness past the seals and no fluid discoloration of the filter paper on two or more inspections shall occur. 5.3.4 Corrosion Pistons and cylinder bore shall not show corrosion, as evidenced by pitting, to an extent discernible to the naked eye, but staining or discoloration shall be
31、 permitted. 5.3.5 Change in hardness Rubber seals shall not decrease in hardness by more than when tested in accoprdance with the procedure specified in 6.7. 5.3.6 Condition of test seals Wheel cylinder seals shall not show excessive deterioration such as scoring, scuffing, blistering, cracking, chi
32、pping (heel abrasion) or change in shape from original appearance. 5.4 Master cylinder seals heat pressure stroking 5.4.1 General Master cylinder seals when tested by the procedure specified in 6.4 shall meet the performance requirements specified in 5.4.2 to 5.4.6. 5.4.2 Lip diameter change The min
33、imum lip diameter of master cylinder seals after the stroking test shall be greater than the master cylinder bore by the minimum dimensions specified in Table 3. Table 2 Lip diameter change of wheel cylinder seals Dimensions in millimetres Diameter of wheel cylinder bore Minimum excess over bore 0,4
34、0 0,50 0,65 0,75 19,05 19,0525,4 25,438,1 38,160 10 IRHD BS ISO 6118:20064 5.4.3 Leakage Same requirement as specified for wheel cylinder seals shall be applied (see 5.3.3). 5.4.4 Corrosion Same requirement as specified for wheel cylinder seals shall be applied (see 5.3.4). 5.4.5 Change in hardness
35、Same requirement as specified for wheel cylinder seals shall be applied (see 5.3.5). 5.4.6 Condition of the test seals Same requirement as specified for wheel cylinder seals shall be applied (see 5.3.6). 5.5 Low temperature performance 5.5.1 Leakage No leakage of fluid shall occur when seals are tes
36、ted according to the procedure specified in 6.5.1. 5.5.2 Bend test The seal shall not crack and shall return to its approximately original shape within when tested in accordance with the procedure specified in 6.5.2. 5.6 Oven ageing 5.6.1 General Seals when tested according to the procedure specifie
37、d in 6.6 shall meet the requirements specified in 5.6.2 and 5.6.3. 5.6.2 Change in hardness The change in hardness shall be within the limits of . 5.6.3 Condition of the test seals The seal shall show no evidence of deterioration, or change in shape from original appearance. Table 3 Lip diameter cha
38、nge of master cylinder seals Dimensions in millimetres Diameter of wheel cylinder bore Minimum excess over bore 0,30 0,40 0,50 0,65 19,05 19,0525,4 25,438,1 38,160 1 min 5 IRHD BS ISO 6118:20065 5.7 Corrosion 5.7.1 General Seals when tested in accordance with the procedure specified in 6.8 shall mee
39、t the requirements specified in 5.7.2 and 5.7.3. 5.7.2 Corrosion of metal strips The seals shall not cause corrosion exceeding the limits shown in Table 4. The metal strips outside of the area where the strips are in contact shall be neither pitted nor roughened to the extent discernible to the nake
40、d eye, but staining or discoloration is permitted. 5.7.3 Fluid-water mixture characteristics The fluid-water mixture at the end of the test shall show no gelling at . No crystalline-type deposits shall form and adhere to either the glass wall or the surface of metal strips. The fluid-water mixture s
41、hall contain no more than sediment by volume. 5.8 Storage corrosion test After 12 cycles in the humidity cabinet when operated in accordance with the procedure specified 6.9, there shall be no evidence of corrosion adhering to or penetrating the wall of the cylinder bore that was in contact with the
42、 test seal. Slight discoloration (staining) or any corrosion or spots away from the contact surface of the test seals may be permissible. 6 Test procedures 6.1 Resistance to fluid at elevated temperature Dimensional test 6.1.1 Apparatus and material The following apparatus and material shall be used
43、 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 Chemical balance, capable of weighing to . Table 4 Permissible change in mass of corrosion tes
44、t strips Test strips Permissible change in massof surface Tinned iron Steel Aluminium Cast iron Brass Copper Zinc mg/cm 2 0,2 0,2 0,1 0,2 0,4 0,4 0,4 23 C 5 C 0,2 % 0,02 mm 250 ml 50 mm 1mg BS ISO 6118:20066 6.1.1.4 Oven, uniformly heated dry air type, conforming to the requirements for method B of
45、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 specimens Two seals shall be used for testing at . 6.1.3 Test procedure Rinse the cups in
46、the alcohol (6.1.1.6) and wipe dry with a clean, lint-free cloth to remove dirt and packing debris. 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 right angles to one another. Take care when measuring th
47、e diameters before and after ageing that the measurements are made 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 manner: weigh the seals in air ( ) to the nearest a
48、nd then weigh the seals immersed in distilled water at room temperature ( ). Quickly dip each specimen in alcohol and then blot dry with filter paper free of lint and foreign material. Immerse two seals completely in of compatibility reference fluid as defined in ISO 4926, in the glass container (6.
49、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 the oven and allow the seals to cool in the container at for to . At the end of the cooling period, remove the seals from the container and rinse in the alcohol and wipe dry with a clean, lint-free cloth. Do not allow the seals
