1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22950-4 SANS 4930:2009Edition 2ISO 4930:2006Edition 2SOUTH AFRICAN NATIONAL STANDARD Road vehicles Elastomeric seals for hydraulic disc br
4、ake cylinders using a non-petroleum base hydraulic brake fluid (Service temperature 150 C max.) This national standard is the identical implementation of ISO 4930:2006 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr
5、Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 4930:2009 Edition 2 ISO 4930:2006 Edition 2 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS TC 45, Rub
6、ber and rubber products, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in October 2009. This SANS document supersedes SANS 4930:2003 (edition 1 and ISO erratum). Reference numberISO 4930:2006(E)ISO
7、2006INTERNATIONAL STANDARD ISO4930Second edition2006-07-15Road vehicles Elastomeric seals for hydraulic disc brake cylinders using a non-petroleum base hydraulic brake fluid (Service temperature 150 C max.) Vhicules routiers Joints en caoutchouc pour cylindres de freins hydrauliques disque utilisant
8、 un liquide de frein base non ptrolire (Temprature maximale dutilisation 150 C) SANS 4930:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 4930:2006(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Ado
9、bes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy
10、. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every car
11、e has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2006 All rights reserved. Unless otherwise specified, no part of this publication may
12、 be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel.
13、+ 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2006 All rights reservedSANS 4930:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 4930:2006(E) ISO 2006 All rights reserve
14、d iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Product requirements. 1 4 Brake test fluid 1 5 Apparatus 2 5.1 Apparatus for test of resistance to fluid at elevated temperature, physical stability and precipitation characteristics 2 5.2 Apparatus for high-temperature stroking
15、 test (see Figure 1) . 2 5.3 Apparatus for low-temperature leakage test (see Figure 2) 3 6 Test requirements. 3 7 Preparation of test specimens 4 8 Resistance to fluid at elevated temperature 4 8.1 Test specimens . 4 8.2 Test procedure 5 9 Resistance to fluid at elevated temperature Precipitation ch
16、aracteristics 5 9.1 Test specimens . 5 9.2 Test procedure 5 10 Resistance to elevated temperature in dry air.6 10.1 Test specimens . 6 10.2 Test procedure 6 11 Ambient-temperature stroking test. 6 11.1 Test specimens . 6 11.2 Test procedure 6 12 High-temperature stroking test . 7 12.1 Test specimens
17、 . 7 12.2 Test procedure 7 13 Low-temperature leakage test . 8 13.1 Test specimens . 8 13.2 Test procedure 8 13.3 Bent test procedure 9 14 Cycling humidity storage corrosion test 9 14.1 Test specimens . 9 14.2 Test procedure 9 SANS 4930:2009This s tandard may only be used and printed by approved sub
18、scription and freemailing clients of the SABS .ISO 4930:2006(E) iv ISO 2006 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carri
19、ed out through ISO technical committees. Each member body interested in a subject for which a technical committee 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. I
20、SO collaborates closely with the International Electrotechnical 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 committees is to prepare Internati
21、onal Standards. Draft International Standards adopted by the technical committees are circulated to the member 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 el
22、ements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 4930 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 2, Braking systems and equipment. This second edition cancels and repla
23、ces the first edition (ISO 4930:1978), which has been technically revised. SANS 4930:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 4930:2006(E) ISO 2006 All rights reserved 1Road vehicles Elastomeric seals for
24、 hydraulic disc brake cylinders using a non-petroleum base hydraulic brake fluid (Service temperature 150 C max.) 1 Scope This International Standard specifies the performance test methods and requirements for elastomeric seals used in road vehicle disc brake cylinders. It is applicable to solid sec
25、tion type seals (square, rectangular, “O”-ring), mounted stationary in the cylinder bore or on the movable piston of disc brakes. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. Fo
26、r undated references, the latest edition of the referenced document (including any amendments) applies. ISO 48, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD) ISO 188, Rubber, vulcanized or thermoplastic Accelerated ageing and heat resistance te
27、sts ISO 1817, Rubber, vulcanized Determination of the effect of liquids ISO 4926, Road vehicles Hydraulic brake systems Non-petroleum base reference fluids ISO 4928, Road vehicles Elastomeric cups and seals for cylinders for hydraulic braking systems using a non-petroleum base hydraulic brake fluid
28、(Service temperature 120 C max.) 3 Product requirements Seals shall conform to the pertinent drawing in all respects, and shall be free from blisters, pin-holes, cracks, protuberances, embedded foreign material, or other physical defects which can be detected by thorough inspection. These elastomeri
29、c seals shall be suitable for operation in a temperature range of 40 C to +150 C. 4 Brake test fluid The test fluid for all tests except the test specified in Clause 14 shall be compatibility fluid as defined in ISO 4926. The fluid specified in Clause 14 shall be ISO fluid for storage corrosion test
30、 as defined in ISO 4926 or the fluid agreed by the parties concerned. SANS 4930:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 4930:2006(E) 2 ISO 2006 All rights reserved5 Apparatus 5.1 Apparatus for test of resistance to fluid at el
31、evated temperature, physical stability and precipitation characteristics 5.1.1 Oven, uniformly heated, dry air type conforming to the requirements of ISO 188. 5.1.2 Test jar, screw-top straight-sided round glass type, having a capacity of approximately 250 ml and inner dimensions of approximately 12
32、5 mm height and 50 mm diameter, with a tinned steel lid (no insert or organic coating). 5.2 Apparatus for high-temperature stroking test (see Figure 1) 5.2.1 Pneumatic or hydraulic pressure source. 5.2.2 Master cylinder. 5.2.3 Pressure gauge. 5.2.4 Wheel cylinder seat stroking fixture. 5.2.5 Cylinde
33、r assembly. 5.2.6 Oven, in accordance with 5.1.1. Key 1 pneumatic or hydraulic pressure source 2 master cylinder 3 pressure gauge 4 wheel cylinder seal stroking fixture 5 oven chamber at +120 C 6 cylinder assembly Figure 1 High-temperature stroking test SANS 4930:2009This s tandard may only be used
34、and printed by approved subscription and freemailing clients of the SABS .ISO 4930:2006(E) ISO 2006 All rights reserved 35.3 Apparatus for low-temperature leakage test (see Figure 2) 5.3.1 Hydraulic pressure gauge. 5.3.2 Master cylinder. 5.3.3 Cylinder assembly. 5.3.4 Cold chamber, at 40 C. Dimensio
35、ns in millimetres Key 1 hydraulic pressure gauge 2 master cylinder 3 cylinder assembly 4 cold chamber at 40 C Figure 2 Low-temperature leakage test 6 Test requirements 6.1 After the test for resistance to fluid at elevated temperature (physical stability) (see Clause 8), the seals shall conform to t
36、he following requirements: a) any change in volume shall be within 0 % to +15 %; b) any change in hardness shall be within 0 IRDH to 15 IRHD. 6.2 After the test for resistance to fluid at elevated temperature (precipitation characteristics) (see Clause 9), not more than 0,3 % sediment by volume shal
37、l be formed in the test fluid used. SANS 4930:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 4930:2006(E) 4 ISO 2006 All rights reserved6.3 After the test for resistance to elevated temperature in dry air (see Clause 10), the seals s
38、hall conform to the following requirements: a) any change in hardness shall be within 0 IRDH to +15 IRHD; b) seal condition: test specimens shall show no evidence of blistering, cracking, or change in shape from the original form. 6.4 After the ambient temperature stroking test (see Clause 11), seal
39、s and assembly shall conform to the following requirements: a) no leakage beyond normal wetting of the bore(s) shall occur during the stroking test; b) no leakage beyond normal wetting of the bore(s) shall occur during the static leak test (see 11.2.3). 6.5 After the high temperature stroking test (
40、see Clause 12), the seals and assembly shall conform to the following requirements: a) no leakage beyond normal wetting of the bore(s) shall occur during the stroking test; b) no leakage beyond normal wetting of the bore(s) shall occur during the static leak test (see 12.2.4). 6.6 After the low temp
41、erature leakage test (see Clause 13), the seals and assembly shall conform to the following requirements: a) no leakage beyond normal wetting of the bore(s) shall occur during the test period or pressure application; b) the seal shall not crack, shall remain flexible and shall return to its approxim
42、ate original shape within 1 min when tested according to the procedure specified in 13.3. 6.7 After the cycling humidity storage corrosion test (Clause 14), the seals and assembly shall conform to the following requirements: a) no evidence of rubber adhesion of the test seal(s) shall appear during d
43、isassembly of the test brake; b) no surface of the sealing systems shall show evidence of corrosion or deterioration which would interfere with proper sealing action; normal staining or discoloration of metal parts is acceptable if surface finish is unaffected. 6.8 After all tests, disassemble the c
44、ylinder and inspect the seal. Record the visual condition of the seal bore and piston. Seals shall not show excessive deterioration such as scoring, scuffing, blistering, cracking, or change in shape from original appearance. 7 Preparation of test specimens All seals to be tested shall be cleaned pr
45、ior to testing by rinsing in isopropanol then blown dry or wiped dry with a lint-free cloth. Seals shall not remain in the alcohol for more than 30 s. 8 Resistance to fluid at elevated temperature 8.1 Test specimens From three or more seals to be tested, obtain a sample of mass 3 g to 5 g. SANS 4930
46、:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 4930:2006(E) ISO 2006 All rights reserved 58.2 Test procedure 8.2.1 Determine and record the initial volume of the sample in accordance with ISO 1817. 8.2.2 Determine and record the ini
47、tial hardness of the sample in IRHD. Measure the hardness as specified in ISO 48 using a microtester (or according to a procedure previously agreed upon between the vendor and purchaser). 8.2.3 Place the sample in the test jar (5.1.2) and completely immerse in 75 ml of brake test fluid (see Clause 4
48、). Seal the test jar to prevent vapour loss and place in the oven (5.1.1) at 150 C 2 C for 70 h. 8.2.4 After the 70 h, remove the sample from the oven and allow to cool in the container at 23 C 5 C for 60 min to 90 min. At the end of the cooling period, remove the sample from the container and rinse
49、 in isopropanol or ethanol then wipe dry with a clean, lint-free cloth. Do not allow the sample to remain in the alcohol for more than 30 s. 8.2.5 Within 60 min of removal from the liquid, determine and record the final volume and hardness, in IRHD, of each seal in accordance with 8.2.1 and 8.2.2. Average the results and report as the change in volume and hardness. 8.2.6 Report the change in volume, V, as a percentage of the original volume. It is given by the formula: ()( )()34 1212100 %mm mm
