GMW-15024-2008.pdf
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1、 WORLDWIDE ENGINEERING STANDARDS Material Specification Elastomers GMW15024 Engine Coolant Hose Copyright 2008 General Motors Corporation All Rights Reserved January 2008 Originating Department: North American Engineering Standards Page 1 of 13 1 Scope This specification covers the material requirem
2、ents of ethylene-propylene-diene (EPDM) engine coolant hose, both large diameter (radiator hose) and small diameter (heater hose). In addition, this specification covers the material requirements for engine coolant hose which is incorporated into crimped metal pipe and hose assemblies, or which is i
3、ncorporated into molded branched hose assemblies. The performance requirements for engine coolant hose and assemblies incorporating engine coolant hose are defined by additional performance specifications. These engine coolant hoses or assemblies incorporating these coolant hoses are intended to wit
4、hstand the effects of circulating solutions containing corrosion inhibitors and glycols and operating under various pressure conditions at continuous operating temperatures from -40C to maximum temperatures ranging from 120 to 150C, dependent on type. The tube and cover stocks of these hoses shall b
5、e made from ethylene-propylene-diene compounded and reinforced with appropriate yarn (as described in 1.1) to meet the requirements of this specification. The radial thickness of the lining shall be at least 50% of the total wall thickness. Cover may be perforated to facilitate degassing during manu
6、facturing operations. Hose shall be black. Alternate reinforcement may be permitted with Engineering Source Approval, and this alternate reinforcement will be referenced as the approved reinforcement for that specific hose approval in MATSPC. Use of high tensile modulus, low elongation polyaramid ma
7、terials (i.e., Technora, Kevlar, and Twaron) may not be suitable for heater hose part numbers which are formed with small bend radii and used for dynamic applications. For additional information or aid in selection of proper reinforcement materials for specific part numbers, contact the regional Mat
8、erials Engineer. No Rubber Manufactures Association (RMA) defined colored tracer or other identifying thread shall be added to the reinforcement specified for the construction of the hose. 1.1 Material Description. Materials covered by this specification are divided into the following types: 1.1.1 T
9、ype A: EPDM coolant hose, sulphur cured utilizing rayon reinforcement, capable of operating to a maximum continuous temperature limit of +120C. 1.1.2 Type B: EPDM coolant hose, sulphur cured utilizing rayon or aramid reinforcement, capable of operating to a maximum continuous temperature limit of +1
10、00C and peak temperatures of +125C. Type B hoses are not suitable for applications involving direct contact with metal fittings. 1.1.3 Type C: EPDM coolant hose, sulphur cured utilizing aramid reinforcement, capable of operating to a maximum continuous temperature limit of +130C. 1.1.4 Type D: EPDM
11、coolant hose, sulphur cured utilizing aramid reinforcement, capable of operating to a maximum continuous temperature limit of +130C, and formulated to contain 0 wt% thiuram, and a maximum of 0.04 wt% thiocarbamates in the EPDM rubber stock for both hose tube and cover. 1.1.5 Type E: EPDM coolant hos
12、e, peroxide cured utilizing aramid reinforcement, capable of operating to a maximum continuous temperature limit of +150C. A di-cumyl peroxide cure system may not be used for this hose. 1.1.6 Type F: EPDM coolant hose, peroxide cured utilizing aramid reinforcement, capable of operating to a maximum
13、continuous temperature limit of +150C, but having greater expansion under pressure than Type E. A di-cumyl peroxide cure system may not be used for this hose. 1.1.7 Type G: EPDM coolant hose, peroxide cured utilizing aramid reinforcement, capable of operating to a maximum continuous temperature limi
14、t of +150C. A di-cumyl peroxide cure system may not be used for this hose. 1.1.8 Type H: EPDM coolant hose, peroxide cured utilizing Polyethylene Terephthalate (PET) reinforcement, capable of operating to a maximum continuous temperature limit of +120C. A di-cumyl peroxide cure system may not be use
15、d for this hose. GMW15024 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2008 General Motors Corporation All Rights Reserved Page 2 of 13 January 2008 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM D380 ISO 3
16、7 ASTM D395 ISO 48 ASTM D412 ISO 188 ASTM D413 ISO 815 ASTM D865 ISO 1431-1 ASTM D471 ISO 1817 ASTM D2240 ISO 7619-1 ISO 36 ISO 23529 2.2 GM Standards/Specifications. 9985809 GMW3001 B 040 1065 GMW3059 GM4486P GMW14329 GM6277M GMW14679 GM9902P 3 Requirements 3.1 Resources 3.1.1 Test Samples. Unless
17、otherwise specified, the shape and size of test pieces shall be in accordance with the relevant Test Method. Minimum six (6) test samples (hoses) are required for initial sample testing. Minimum three (3) test samples (hoses) are required for inspection testing. Samples are finished parts or to be t
18、aken from finished parts. (Where the dimensions on the finished parts do not allow preparing of test pieces, tests are to be performed on sheet material of same production batch. The same state of cure between slabs or buttons and finished parts must be assured by appropriate tests, which must be de
19、scribed in the test report.) If not otherwise stated, mechanical properties in delivery state and after heat or fluid immersion are to be tested at +23 5C and with the same test methods. Unless otherwise stated, ambient temperature test conditions shall be held to +23 5C. Unless otherwise stated, al
20、l other temperatures except +23 5C shall be held to 3C. 3.1.2 Conditioning. Conditioning shall be as specified in the relevant Test Method. 3.1.3 Equipment. Conforming to the relevant Test Methods. 3.1.4 Calibration. The test facilities and equipment shall be in good working order and shall have a v
21、alid calibration label. 3.1.5 Alternatives. Alternative test facilities and equipment may also be used. However, all measuring variables as specified in this specification shall be determined correctly with respect to its physical definition. 3.1.6 Facilities. Conforming to the relevant Test Methods
22、. 3.1.7 Deviations. Deviations from the requirements of this specification shall have been agreed upon. Such deviations shall be specified on component drawings, test certificates, reports, etc. 3.2 Material and Performance Requirements. 3.2.1 Design Validation Testing. Material properties (material
23、/compound approval) are summarized in Table 1, performance requirements (construction approval) in Table 2. For full approval of hose compliance to the requirements, Table 1 and Table 2 are needed. For Test Plan, see Appendix A. 3.2.2 Product Validation Testing. If not defined otherwise, the followi
24、ng testing should be done for production audit testing (see also Appendix B): All tests per Table 1 except Long Term Immersion, Ozone Resistance, Resistance to Electrochemical Degradation, Bloom and Paint Compatibility. Burst Strength, Pressure Impulse and Fatigue Test per Table 2. 3.2.3 Audit/Inspe
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