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1、BRITISH STANDARD BS 7038:1988 ISO 4081:1987 Specification for Rubber coolant hoses and tubing for use on private cars and light commercial vehicles ISO title: Rubber Coolant hoses and tubing for use on private cars and light commercial vehicles Specification UDC 678.44:678.033:621.643.33:678-462:621
2、.43:629.1-46:629.1-474:620.1 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:01:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7038:1988 This British Standard, having been prepared under the direction of the Rubber Standards Committee, was published under t
3、he authority of the Board of BSI and comes into effect on 30 November 1988 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference RUM/9 Draft for comment 86/54537 DC ISBN 0 580 16935 9 Committees responsible for this British Standard The preparation of this
4、 British Standard was entrusted by the Rubber Standards Committee (RUM/-) to Technical Committee RUM/9, upon which the following bodies were represented: Association of Metropolitan Authorities British Coal Corporation British Compressed Gases Association British Gas plc British Railways Board Briti
5、sh Rubber Manufacturers Association Chief and Assistant Chief Fire Officers Association Fire Extinguishing Trades Association Home Office Institution of Fire Engineers Institution of Production Engineers Liquefied Petroleum Gas Industry Technical Association (UK) London Fire and Civil Defence Author
6、ity London Regional Transport Malaysian Rubber Producers Research Association Ministry of Defence Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08
7、 13:01:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7038:1988 BSI 01-2000i Contents Page Committees responsibleInside front cover National forewordii 1Scope and field of application1 2References1 3Tubing and hose bores1 4Size and tolerances1 5Physical tests and specifications1 6Marking2 Annex A
8、Mechanical fatigue test5 Annex B Cold flexibility test ( 40 C)5 Table Requirements for slabs and finished products3 Publications referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:01:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7
9、038:1988 ii BSI 01-2000 National foreword This British Standard has been prepared under the direction of the Rubber Standards Committee. It is identical with ISO 4081:1987 “Rubber Coolant hoses and tubing for use on private cars and light commercial vehicles Specification”, published by the Internat
10、ional Organization for Standardization (ISO). Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; at
11、tention is drawn especially to the following. Apart from in line 6 of clause 1 and line 3 of 5.10, the comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, r
12、eferring to this standard, they should be read as “British Standard”. Cross-references International StandardCorresponding British Standard ISO 37:1977 BS 903 Methods of testing vulcanized rubber Part A2:1971 Determination of tensile stress-strain properties (Technically equivalent) ISO 48:1979Part
13、A26:1969 Determination of hardness (Technically equivalent) ISO 188:1982Part A19:1986 Heat resistance and accelerated ageing tests (Identical) ISO 471:1983Part A35:1985 Temperatures, humidities and times for conditioning and testing of test pieces (Identical) ISO 815:1972Part A6:1969 Determination o
14、f compression set after constant strain (Technically equivalent) ISO 1307:1983BS 6597:1985 Specification for rubber and plastics hoses: internal diameters and tolerances and tolerances on length (Identical) ISO 1402:1984BS 5173 Methods of test for rubber and plastics hoses and hose assemblies Sectio
15、n 102.1:1985 Hydrostatic tests (Identical) ISO 1653:1975BS 903 Methods of testing vulcanized rubber Part A39:1980 Determination of compression set under constant deflection at low temperatures (Identical) ISO 1746:1983BS 5173 Methods of test for rubber and plastics hoses and hose assemblies Section
16、103.5:1985 Bending tests (Identical) ISO 1817:1985BS 903 Methods of testing vulcanized rubber Part A16:1987 Determination of the effect of liquids (Identical) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:01:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
17、7038:1988 BSI 01-2000iii The Technical Committee has reviewed the provisions of ISO 1176 and SAE J20e, to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. SAE J20e is published by the Society of Automotive Engineers and is avail
18、able from the following address. Society of Automotive Engineers 3001 West Big Beaver Suite 602 Troy Michigan 48084-9947 USA. Textual error. When adopting the text of the International Standard, the textual error given below was discovered. It has been marked in the text and has been reported to ISO
19、 in a proposal to amend the text of the International Standard. In 5.12 “the maximum coefficient of deformation (T/D) shall not exceed 0.7” should be read as “the ratio T/D shall not be less than 0.7”. A British Standard does not purport to include all the necessary provisions of a contract. Users o
20、f British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. International StandardCorresponding British Standard ISO 7233:1983 BS 5173 Methods of test for rubber and plastics hoses and hose assemblie
21、s Section 102.9:1985 Determination of resistance to vacuum (Identical) ISO 7326:1984Section 106.3:1986 Determination of ozone resistance (Identical) ISO 8033:1985Section 103.1:1986 Determination of adhesion between components (Identical) Summary of pages This document comprises a front cover, an ins
22、ide front cover, pages i to iv, pages 1 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, Lon
23、don South Bank University, Fri Dec 08 13:01:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:01:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7038:1988 BSI 01-20001 1 Scope and field of application This
24、 International Standard specifies the requirements for vulcanized compounds and rubber hoses and tubing for use in pressurized and unpressurized cooling circuits containing 1,2-ethanediol-based anti-freeze in internal combustion engines for private vehicles and commercial vehicles with an unladen we
25、ight (as defined in ISO 1176) of 3.5 t or less. For the purposes of this International Standard, three different types related to design working temperatures are specified: Type 1: Tubing and hoses for operating temperatures up to 100 C Type 2: Tubing and hoses for operating temperatures up to 125 C
26、 Type 3: Tubing and hoses for operating temperatures up to 150 C Two classes for each type related to the operating environment are also specified: Class A: Tubing and hoses for use in positions where they are not likely to be subjected to outside surface contamination by fuel and lubricating oils.
27、Class B: Tubing and hoses for use in positions where they are likely to be subjected to outside surface contamination by fuel and lubricating oils. This International Standard covers tubing and hoses whether supplied pre-formed or in straight lengths. It does not cover tubing and hoses made from sta
28、ple fibre reinforced compounds. 2 References ISO 37, Rubber, vulcanized Determination of tensile stress-strain properties. ISO 48, Vulcanized rubbers Determination of hardness (Hardness between 30 and 85 IRHD). ISO 188, Rubber, vulcanized Accelerated ageing or heat-resistance tests. ISO 471, Rubber
29、Standard temperatures, humidities and times for the conditioning and testing of test pieces. ISO 815, Vulcanized rubbers Determination of compression set under constant deflection at normal and high temperatures. ISO 1176, Road vehicles Weights Vocabulary. ISO 1307, Rubber and plastics hoses Bore di
30、ameters and tolerances on length. ISO 1402, Rubber and plastics hoses and hose assemblies Hydrostatic testing. ISO 1653, Vulcanized rubbers Determination of compression set under constant deflection at low temperatures. ISO 1746, Rubber or plastics hoses and tubing Bending test. ISO 1817, Rubber, vu
31、lcanized Determination of the effect of liquids. ISO 7233, Rubber and plastics hoses and hose assemblies Vacuum resistance Methods of test. ISO 7326, Rubber and plastics hoses Assessment of ozone resistance under static conditions. ISO 8033, Rubber and plastics hoses Determination of adhesion betwee
32、n components. SAE J20e, Coolant system hoses. 3 Tubing and hose bores The bore of all tubing and hoses shall be clean and free from any contamination when examined under the naked eye. 4 Size and tolerances Bore sizes and tolerances shall be in accordance with ISO 1307. 5 Physical tests and specific
33、ations The following tests shall be carried out on finished products where possible (or as agreed between manufacturer and user) with the exception of compression set, which shall be carried out on standard test slabs. 5.1 Hardness Hardness, determined in accordance with the procedure specified in I
34、SO 48 (normal test), shall comply with the values shown in the Table. 5.2 Tensile strength and elongation at break Tensile strength and elongation at break, determined in accordance with the procedure specified in ISO 37 on a No. 2 dumb-bell, shall comply with the values shown in the Table. 5.3 Chan
35、ge in properties after accelerated ageing Accelerated ageing shall be carried out in accordance with ISO 188 in a ventilated drying oven under the following conditions using test pieces as described in 5.1 and 5.2. Type 1: 7 days at 100 C Type 2: 7 days at 125 C Type 3: 7 days at 150 C In all cases,
36、 the change in hardness, tensile strength and elongation at break shall not exceed the values shown in the Table. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:01:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7038:1988 2 BSI 01-2000 5.4 Compression set C
37、ompression set, determined in accordance with the procedure specified in ISO 815, using a large test piece, shall comply with the values shown in the Table. 5.5 Resistance to coolant This test applies only to tubing and the hose lining compounds. The test liquid shall be made up of equal volumes of
38、1,2-ethanediol and distilled water. Test pieces, as specified in 5.1 and 5.2 shall be left for 7 days in the test liquid at 100 1 C as specified in ISO 1817 after which they shall be tested for hardness, tensile strength, elongation at break and change in volume. The values obtained shall not exceed
39、 those shown in the Table. 5.6 Resistance to oil No. 3 This test applies only to Class B tubing and hose covers. When tested in accordance with ISO 1817 for 72 h in oil No. 3 at a temperature of 100 C, volumetric changes shall not exceed the values shown in the Table. 5.7 Resistance to ozone This te
40、st applies only to tubing and hose cover compounds. The test shall be carried out in accordance with ISO 7326 under the following conditions: After exposure, the test pieces shall show no cracks under a magnification of 2. 5.8 Minimum burst pressure When tested in accordance with ISO 1402 at ambient
41、 laboratory temperature (ISO 471), the tubing and hose shall have burst pressures not less than the values shown in the Table. 5.9 Adhesion This test applies only to hose. The adhesion between components, when tested in accordance with ISO 8033 in the “as manufactured” condition and after ageing in
42、air for 72 h at the operating temperature for the Type, shall comply with the values shown in the Table. 5.10 Vacuum resistance This test applies only to tubing and hoses of bore sizes 25 mm and over and shall be carried out in accordance with ISO 7233. When subjected to a vacuum of 0.03 MPa at 100
43、C for a period of 10 min, the sample shall not collapse by more than the value shown in the Table. 5.11 Compression set 5.11.1 Compression set at 30 C A circular sample cut from the wall of the tubing or hose shall be tested. The ratio of diameter to thickness of the test piece shall be between 2 an
44、d 2,3. When tested in accordance with ISO 1653, at a temperature of 30 C and after 30 min recovery, the compression set shall not exceed the value shown in the Table. 5.11.2 Compression set at the Type temperature This test and the requirement will be defined a later date. 5.12 Resistance to kinking
45、 This test applies only to straight tubing and hoses of bore sizes of 19,5 mm or less. When tested in accordance with ISO 1746 around mandrel diameters equal to the values shown in the Table dependent on the bore size, the maximum coefficient of deformation (T/D) shall1) not exceed 0,7. 5.13 Mechani
46、cal fatigue strength When tested in accordance with Annex A, tubing or hose shall not rupture before the number of cycles shown in the Table is exceeded. 5.14 Low-temperature flexibility When tested in accordance with Annex B, tubing or hose shall not fracture nor show any cracks or breaks. 6 Markin
47、g Except by agreement between manufacturer and user, the tubing and hose shall be marked with the following information: a) the number of this International Standard; b) the manufacturers name or trade mark; c) the type and class; d) the month and year of manufacture. Concentration:50 5 pphma Durati
48、on:70 h Elongation:20 % Temperature:40 C a Parts per hundred million by volume. +2 0 1) See national foreword for details of textual error. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:01:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7038:1988 BSI 01-20
49、003 Table Requirements for slabs and finished products Sub-clauseCharacteristicUnitTubing Hose LiningCover 5.1Nominal hardnessIRHD707070 Nominal hardness toleranceIRHD 5 +5 10 +5 10 5.2Tensile strength, min.MPa1088 5.2Elongation of break, min.%250250250 5.3Accelerated ageing Change in hardness, max.IRHD Types 1 and 2+ 10 0 + 10 0 + 10 0 Type 3+ 15 0 + 15 0 + 15 0 Change in tensile strength, max.% Type 1+ 10 0 + 10 0 + 10 0 Type 2+ 20 0 + 20 0 + 20 0 Type 3+ 25 0 + 25 0 + 25 0 Change in el