GM Genuine Parts Engine Wire Harness Tape Standard

This article is the Chinese translation of GM wiring harness tape standard GMW16740.

1-Introduction
NOTE: Nothing in this standard supersedes applicable laws and regulations.
Note: In the event of conflict between English and the national language, English shall prevail.
1.1 Purpose: This standard specifies the dimensions, test methods and requirements for wire harness tapes.
1.2 Applicability: This standard applies to all passenger car and light-duty heavy-duty truck wiring harnesses, allowing for the evaluation and selection of wiring harness tapes based on a given application. The specified temperature classes, defined in Table 1, cover the different temperature ranges encountered in automobiles.
Table 1: Temperature levels

GM wire harness tape

Note 1: A temperature of -25 is also acceptable for polyvinyl chloride (PVC). See 4.8.4.
1.3 Note: There is no international or national equivalent to this standard.

2-Reference
Note: Only the latest approved standards are applicable, otherwise there are special instructions
2.1 External standards/instructions
2.3 Other reference materials
International Automotive Task Force (IATF), IATF 16949 can be found at the Independent Resource Locator (URL)

3-Test Preparation and Assessment
3.1 Resources
3.1.1 Equipment: Temperature-controlled space with power sockets and internet connection
3.1.1.1 Calibration: Test equipment should be in good working order and should have a valid calibration label.
3.1.1.2 Alternatives: Alternative test equipment may be used. However, all measurement variables specified in this standard should be correctly selected based on physical definitions.
3.1.1.3 Thermostat. Unless otherwise specified, when a thermostat is required, it shall be a hot air thermostat. The type of thermostat should be pressurized air or mechanical convection. Looking at Figure 1, the air should enter the oven in such a way that it flows over the surface of the test sample and exits near the top of the oven. At a specific aging temperature, the thermostat should have a complete number of air changes of no less than 8 and no more than 20 per hour. Temperature uniformity and air exchange measurements are described in ASTM D5423 and ASTM D5374.

Wire Harness Tape Test Preparation and Evaluation

3.1.2 Equipment See each individual test in Chapter 4
3.1.3 Test Models/Test Samples. The number of test samples is reflected in each individual test. Parts not in the prototype drawing tool cannot be used. Remove three layers of tape from the tape roll before removing the test sample. For each set of tests, the test sample cannot be older than 6 months old at the start of the test and must not have been previously used in other tests. .
3.1.4 Test time
Total validity period: 125 days
Test time: 4400 hours
Time delay coordination: 80 hours IATF16949 on independent resource locator (URL)
3.1.5 Testing requirement information.
3.1.5.1 Product Quality Assurance: Tape manufacturers must perform quality management in accordance with the International Automotive Task Force (IATF), IATF 16949, which can be found at the independent resource locator (URL), to perform quality management. Appropriate statistical tools must be used to analyze the process and generate data so that variations in the final product can be continuously reduced. The tape supplier must establish a multifunctional team (CFT) to develop a control plan and process Failure Mode and Effects Analysis (FMEA) for approval by the engineering and quality departments of the appropriate wire harness supplier.
Tape manufacturers must develop control plans at the system, subsystem, part and material levels appropriate for the product being supplied. At a minimum, the control plan should include comprehensive documentation. Documentation should include product/process characteristics, process controls, and testing and measurements that occur during volume production. When the product or process changes, when the process becomes unstable, or when the process becomes ineffective, the control plan should be revised and updated.
Process FMEA is an aid to ensure that the wire harness tape continues to maintain all performance characteristics that can be found in the specifications. Efforts should be made to continuously improve the process for defect prevention rather than defect detection.
Comment: IATF 16949 requires reliable measurement equipment. Because most tapes described in this specification are material destructive measurements. There is a high level of complexity involved in sample preparation, environmental conditions and equipment effects. Because testing of polymer materials in general is highly variable. At the same time, the replacement (R&R) requirement of less than 30% of the ordinary IATF 16949 cannot be met. Because these are industry standard tape tests. Although they have a lower performance level, they can be used.
3.1.6 Personnel/Skills During this process, correct training is required to operate the instrument. Each test should be completed by professional personnel.
3.2 Preparation: See each individual test in Chapter 4
3.3 Conditions
3.3.1 Environmental conditions Unless otherwise specified, all test samples should be placed in an environment at room temperature 23 °C ± 3 °C and relative humidity (RH) 45%-75% for at least 16 hours. Unless otherwise specified, all tests, except “process” tests, should be performed at room temperature 23 °C ± 3 °C and relative humidity (RH) 45%-75%.
3.3.2 Test conditions. Deviations from the requirements of this standard shall be accepted. These requirements should be specified on the part’s drawings, test certificates, reports, etc.
3.4. Instructions: see each individual test in Chapter 4
3.5 Data. See 3.7.1.
3.6 Security

Aging test of wire harness tape

This engineering standard may involve safety requirements and hazardous materials, methods of operation and equipment. This standard does not propose to address all safety issues regarding its use. Users of this standard are responsible for ensuring that all appropriate safety and health measures are followed. This meeting design requires some special training. Safety and health standards include local-specific rules and procedures, company rules and procedures, and government standards. Liaison with the appropriate local safety and health authorities should be established to provide further direction and guidance on these matters.
3.7 Documentation: Samples of parts or materials issued by this standard shall be tested for compliance with the requirements of this standard and approved by the responsible GM department before shipment of production-level parts and materials can begin.
Any changes in parts or materials, such as design, function, performance, manufacturing process and origin, will require a re-release of the product. It is the supplier’s sole responsibility to voluntarily provide customers with documentation of any changes or product/process changes required to request a new product release.
If this is not agreed, the entire verification test should be repeated and documented by the supplier before shipment of the modified or changed product. In some cases, a shorter test can be agreed between the responsible GM department and the supplier.
3.7.1 Test results. Test results should be recorded in the test report. See Data Sheet A1 in Appendix A. Along with the comparison of results/data (pass/fail decisions) requirements, test results should at least include the following requirements:
• Supplier Name Supplier Name
• date
• Product nameProductDesignation
•GM Part NumberGM Part Number
• InternationalMaterial Data Standards (IMDS) Identification (ID) InternationalMaterial Data Standards (IMDS) Identification (ID)
• Temperature ClassTemperature Class
• Type of Adhesive
• TestResult and Interpretation of Test Result
Tests should be run at the frequencies described in Appendix A, Table A1

Anti-noise test of wiring harness tape

4 Requirements and procedures
4.1 Materials: Tapes should meet the requirements of this standard for 6 months storage and be protected from direct sunlight. The color of the tape should be defined according to GMW3176. As long as other properties remain unchanged, the release of one color also indicates the others.
4.2 Labeling. Each roll of tape should be labeled with the supplier’s name.
4.2.1 GM Covering Naming Code System. For identification on engineering drawings, each individual roll of tape shall be coded as shown in Figure B1. Use attributes from tables B1 to B8
4.3 Dimensions
4.3.1 Overall thickness: Testing shall be carried out in accordance with BS EN 1942. For compressive noise reduction tapes, testing should be performed in accordance with ISO 2286. The single value must not exceed the range given in Table C1 in Appendix C.
4.3.2 Tape width:
4.3.2.1 Test samples. Prepare two test samples each 450mm long.
4.3.2.2 Equipment: a steel ruler with a scale spacing of 0.5mm.
4.3.2.3 Procedure: Place the rubber surface of the test sample without tension or pressure on a hard, smooth surface. Measure the width with a steel ruler perpendicular to the edge at 3 similarly equidistant points along the length.
4.3.2.4 Result analysis. The width should be according to Table C1 of Appendix C. The width deviation should be ≤ ± 1mm
4.4 Tensile strength and elongation. The test shall be performed in accordance with ISO 29864, except that five specimens of the same width are prepared, each specimen 200 mm long. For tapes with a width > 25 mm, a 25 mm wide test specimen shall be cut vertically from the tape. Use a sharp knife to get a clean cut edge. For an explanation of the test results, see Table C1 in Appendix C.
4.5 Unwinding force: The test shall be performed in accordance with EN 1944. For analysis of the test results, please see Table C1 in Appendix C. Record the average force. NOTE: Unwinding force should be agreed upon between the tape supplier and the wire harness supplier.
4.6 Peel Force: Testing shall be performed in accordance with ISO 29862, Process 1,180 Degree (°) Test.
4.6.1 Test samples. Prepare 3 sets of samples with the same width, each sample is 300mm long. For tapes with a width > 25 mm, a 25 mm wide test specimen shall be cut vertically from the tape. Use a sharp knife to get a clean cut edge. .
4.6.2 Process: Peel viscosity is reflected by tape width N/25 mm
4.6.3 Analysis of test results. See Table C1 in Appendix C
4.7 Adhesion to tape base: This test shall be performed in accordance with ISO 29862, Process 2, 180° test for adhesion to tape base. Peel viscosity is expressed in tape width N/25 mm
4.7.1 Test samples: Prepare 3 sets of samples with the same width, each sample is 300mm long. For tapes with a width > 25 mm, a 25 mm wide test specimen shall be cut vertically from the tape. Use a sharp knife to get a clean cut edge. .
4.7.2 Analysis of test results. See Table C1 in Appendix C.

4.8 Bending test.
4.8.1 Bending test after short-term aging
4.8.1.1 Test samples: Prepare 3 sets of test samples, each sample consists of 16 0.35mm2 insulated wires (ISO thin wall) 0.35mm2 or 12 0.5mm2 insulated wires. All insulated conductors (cables) required for testing should be tetrafluoroethylene and ethylene copolymer (ETFE). When testing tapes in the F, F, G, H temperature classes listed in Table 1, contact the responsible GM department to inquire what type of wire should be used in the test. The length of the wire is 600mm. Wires should be tightly wound and bundled. The tape should be wrapped around the test specimen from the bottom, with each wrap following one another covering one-half the width of the tape from the previous wrap. See Figure 2.
4.8.1.2 Procedure: Test samples should be stored at room temperature and relative humidity for ≥ 24 h, see 3.3.1. Place the test sample vertically in a convection thermostat for 240 hours. The thermostat is shown in Table 1. Test samples are ≥ 50 mm apart from each other and from the inner surface of the thermostat. After aging, the test specimens should be stored for 6 hours at a temperature of 23 °C ± 3 °C and wound on a 30 mm mandrel at the same temperature. The test specimen should be bent 720°. The time to bend 360° should be <5 s, and the time to hold the sample in this position should be > 60 s. The test samples were then visually inspected.
4.8.1.3 Analysis of test results: The test sample is not allowed to have any glue overflow, cracking, loosening, or other failures.
4.8.2 Bending test after long-term aging

4.8.2.1 Test sample: See 4.8.1.1, however, the structure of the test sample shall be as shown in Table 2.
Table 2: Types of wires used for long-term aging bend testing and humidity effects
Note 1: Type of wire insulation: ETFE = Ethylene Tetrafluoroethylene; FEP = Fluorinated Ethylene Propylene; PVC = Polyvinyl Chloride, XLFE = Cross-linked Fluorinated Ethylene (cross-linked fluoroethylene); XLPE = Cross-linked Polyethylene (cross-linked polyethylene); XLPO = Cross-Linked Polyolefin (cross-linked polyolefin).
4.8.2.2 Procedure: Test samples should be stored at room temperature and relative humidity for ≥ 24 h, see 3.3.1. Place the test sample in a forced air or convection oven No. 3000. See Table 1 for the thermostat. The test samples are ≥ 50mm apart from each other and from the inner surface of the thermostat. Test samples composed of different tape materials should not be measured at the same time. After aging, the test specimens should be stored for 6 hours at a temperature of 23 °C ± 3 °C and wound on a 30 mm diameter mandrel at the same temperature. The test specimen should be bent 720°. The time to bend 360° should be <5 s, and the time to hold the sample in this position should be > 60 s. The test samples were then visually inspected.
4.8.2.3 Analysis of test results: The test samples are not allowed to have any glue overflow, cracking, loosening, or other failures.
4.8.3 Bending test after overload temperature aging.
4.8.3.1 Test sample. See 4.8.1.1, but the insulation material of the wires for this test should be ETFE.
4.8.3.2 Procedure: Test samples should be stored at room temperature and relative humidity for ≥ 24 h. See 3.3.1. Place the test sample vertically in a hot oven for 6 h. See Table 1 for temperatures. Test samples are ≥ 50 mm apart from each other and from the inner surface of the thermostat. After aging, the test specimens should be stored for 6 hours at a temperature of 23 °C ± 3 °C and wound on a 30 mm diameter mandrel at the same temperature. The test specimen should be bent 720°. The time to bend 360° should be < 5 s, and the time to hold the sample in this position should be > 60 s. The test samples were then visually inspected.
4.8.3.3 Analysis of test results: The test sample is not allowed to have any glue spillage, cracking, loosening, or other failures.
4.8.4 Cold bending test
4.8.4.1 Test samples: Prepare 3 groups of samples. Each group of samples consists of two mutually twisted wires with a size of 0.35mm2. All wire insulation for this test should be ETFE or FEP.
4.8.4.2 Equipment. Cold room
4.8.4.3 Procedure: The test sample should be stored at a temperature of -40 °C for at least 4 hours, and then wound on a mandrel with a diameter of 30 mm at the same temperature (-40 °C). The test specimen should be bent 720°. The time to bend 360° should be < 5 s, and the time to hold the sample in this position should be > 60 s. The test samples were then visually inspected. If the PVC tape fails the test at -40 °C, this test can be performed at -25 °C.
4.8.4.4 Analysis of test results: The test samples are not allowed to have any glue overflow, cracking, loosening, or other failures.
4.8.5 Bending test after humidity effect
4.8.5.1 Test sample: see 4.8.1.1, but the structure of the test sample should be as shown in Table 2
4.8.5.2 Procedure. The test samples shall be stored for 900 h in a climate-simulated cubicle with a relative humidity of 95% ±5% and a temperature of +70 °C. After aging, the test specimens should be stored for 6 hours at a temperature of 23 °C ± 3 °C and wound on a 30 mm diameter mandrel at the same temperature. Then perform a visual inspection.
4.8.5.3 Analysis of test results: The test samples are not allowed to have any glue overflow, cracking, loosening, or other failures.
4.9 Wear resistance.
4.9.1 Needle Wear Resistance. This test is done in accordance with ISO6722-1, with modifications from 4.9.2 to 4.9.4

4.9.2 Test sample: 100mm tape should be wrapped around a mandrel with a diameter of 5.0 mm ± 0.1 mm, and the mandrel should be placed in the equipment. The tape should be wrapped from the bottom of the mandrel, and the tape should be wrapped around the test specimen from the bottom, with each wrap following one another covering one-half the width of the tape from the previous wrap. Ten sets of test samples should be prepared.
4.9.3 Equipment/Process. Equipment should:
• Record the number of cycles before failure, stopping when the needle wears the insulation and maintaining contact with the needle.
• With a direct 0.45 mm ± 0.01 mm needle consisting of spring wire according to ISO 6931-1
• Applied vertical force: 7 N ± 0.05 N
• Operate at 55 cycles/minute ± 5 cycles/minute. Note: A cycle should contain a reciprocating motion
• Wear length should be 15 mm ± 1 mm
•Under dynamic conditions, a sustained vertical force is generated on the test specimen
• The test sample is not allowed to move during the test. If clamping is required, the longitudinal force exerted on the connector must not exceed 100 N/mm2
• Have a stable base
• Tested at 23 °C ± 1 °C
Repeat this process to read 10 sets of data, but need to replace the needle after each test.
Perform one test on each sample in the 10 groups. And when the needle wears the insulation layer and remains in contact with the needle, the number of cycles is determined. 4.9.4 Analysis of test results. The test specimen shall withstand the minimum number of cycles of Table C1 of Appendix C without being switched. If the test results are compared to the parameters of the tube or sleeve, note that the tape usually has a 50% overlap, that is, a double layer
4.10 Resistant to liquid chemicals
4.10.1 Bending test after immersion in fluid. Adhesive tape used in exposed areas shall resist incidental contact with chemicals and motor vehicle fluids. Only tapes of temperature classes C, D, E and higher need to be measured.
4.10.2 Test sample: Two wires with a cross-sectional area of 0.35mm2 and the same temperature grade as the tape are twisted together and wrapped with 50% overlap of the tape, and are used for testing. For each fluid test, prepare 3 sets of 300mm long samples.
4.10.3 Procedure: Immerse the test sample in the test fluid in Table 3 for 5 minutes. For battery acid, the test sample should be immersed for 5 seconds. This can be done by making the sample into a “U” shape and leaving both ends of the sample outside the test fluid. Diesel and gasoline are dipped or sprayed onto the sample until the liquid begins to drip. Store the test samples in the thermostat for 48 hours. The temperature of the thermostat is shown in Table 3. After that time, remove the samples and store them at room temperature for 3-16h. Wrap each set of test samples on a mandrel with a diameter of 20 mm, and visually inspect each sample for cracks, tears, and sol. Unwrap the wires, wrap them around a 2mm mandrel, and visually inspect the wire insulation for cracks, tears, or melting.
Table 3: Media for fluid resistance chemical testing