ISO-4925-2005.pdf
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1、 Reference number ISO 4925:2005(E) ISO 2005 INTERNATIONAL STANDARD ISO 4925 Second edition 2005-02-01 Road vehicles Specification of non-petroleum-base brake fluids for hydraulic systems Vhicules routiers Spcifications pour liquides de frein base non ptrolire pour systmes hydrauliques ISO 4925:2005(
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5、 2005 All rights reserved. Unless otherwise specified, no part of this publication may 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
6、country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2005 All rights reserved ISO 4925:2005(E) ISO 2005 All rights reserved iii Contents Page Forewordiv In
7、troduction v 1 Scope1 2 Normative references .1 3 Materials.2 4 Specifications2 5 Test methods.5 5.1 Viscosity.5 5.1.1 General.5 5.1.2 Repeatability (single analyst).5 5.1.3 Reproducibility (multi-laboratory).5 5.2 Equilibrium reflux boiling point (ERBP) .5 5.2.1 General.5 5.2.2 Preparation of appar
8、atus5 5.2.3 Test procedure 6 5.2.4 Repeatability (single analyst).6 5.2.5 Reproducibility (multi-laboratory).6 5.2.6 Wet ERBP test .6 5.3 pH9 5.4 Fluid stability.9 5.4.1 High-temperature stability9 5.4.2 Chemical stability10 5.5 Corrosion.10 5.5.1 Metal strip characteristics prior to testing.10 5.5.
9、2 Preparation of joints .10 5.5.3 Test procedure 11 5.6 Fluidity and appearance at low temperatures11 5.6.1 At 40 C for 144 h .11 5.6.2 At 50 C for 6 h .12 5.7 Water tolerance .12 5.7.1 At 40 C for 22 h .12 5.7.2 At 60 C for 22 h 12 5.8 Compatibility/miscibility with ISO 4926 fluid12 5.8.1 At 40 C f
10、or 22 h .12 5.8.2 At 60 C for 22 h 12 5.9 Resistance to oxidation12 5.10 Effect on rubber 13 5.10.1 General.13 5.10.2 Test procedures 13 5.10.3 Repeatability (single analyst).14 5.10.4 Reproducibility (multi-laboratory).14 Annex A (normative) ISO Styrene-butadiene rubber (SBR) brake cups for testing
11、 brake fluid.15 Annex B (normative) Corrosion test strips18 Annex C (normative) Corrosion strip assembly19 Annex D (normative) Standard ethylene, propylene and diene (EPDM) terpolymer rubber slabstock20 Annex E (normative) Triethylene glycol monomethyl ether (TEGME) brake fluid grade22 Bibliography
12、.25 -,-,- ISO 4925:2005(E) iv ISO 2005 All rights reserved Foreword 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 carried out through ISO technical committ
13、ees. 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. ISO collaborates closely with the Int
14、ernational 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 International Standards. Draft International
15、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 elements of this document may be the s
16、ubject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 4925 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 4925:1978
17、), which has been technically revised. -,-,- ISO 4925:2005(E) ISO 2005 All rights reserved v Introduction The specifications for fluids given in this International Standard incorporate a range of performance standards in use throughout the world at the time of publication. The classes include fluids
18、 technically equivalent to those designated DOT 3, DOT 4 and DOT 5.1. The major use of these fluids is in the hydraulic brake and clutch systems of road vehicles, but they can also be used in any suitable hydraulic system. -,-,- INTERNATIONAL STANDARD ISO 4925:2005(E) ISO 2005 All rights reserved 1
19、Road vehicles Specification of non-petroleum-base brake fluids for hydraulic systems 1 Scope This International Standard gives the specifications requirements and test methods for non-petroleum-base fluids used in road-vehicle hydraulic brake and clutch systems that are designed for use with such fl
20、uids and equipped with seals, cups or double-lipped type gland seals made of styrene-butadiene rubber (SBR) and ethylene-propylene elastomer (EPDM). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the editio
21、n cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 37:1994, Rubber, vulcanized or thermoplastic Determination of tensile stress-strain properties ISO 48:1994, Rubber, vulcanized or thermoplastic Determination of hardness (ha
22、rdness between 10 IRHD and 100 IRHD) ISO 812:1991, Rubber, vulcanized Determination of low-temperature brittleness ISO 815:1991, Rubber, vulcanized or thermoplastic Determination of compression set at ambient, elevated or low temperatures ISO 3104:1994, Petroleum products Transparent and opaque liqu
23、ids Determination of kinematic viscosity and calculation of dynamic viscosity ISO 4926:1978, Road vehicle Hydraulic brake systems Non petroleum base reference fluids ASTM D 91, Standard test method for precipitation number of lubricating oils ASTM E 298, Standard test methods for assay of organic pe
24、roxides ASTM D 395, Standard test methods for rubber property Compression set ASTM D 412, Standard test methods for vulcanized rubber and thermoplastic elastomers Tension ASTM D 664, Standard test method for acid number of petroleum products by potentiometric titration ASTM D 746, Standard test meth
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