1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW15014 Mesh Netting Copyright 2012 General Motors Company All Rights Reserved June 2012 Originating Department: North American Engineering Standards Page 1 of 11 1 Scope 1.1 Material Description. This specification describes material suitable
2、 for making automotive map pockets, convenience nets and storage nets. The material shall be knitted or braided, using man-made fibers, colored and finished to acceptable color, pattern, and physical properties. The mesh netting may be elastic or non-elastic. 1.2 Symbols. A unique finish symbol will
3、 be given to each construction by the responsible GM representative at initial development. 1.3 Typical Applications. Mesh fabric map pockets or convenience nets in occupant area or trunk of the vehicle. 1.4 Remarks. For requirements for vehicles without solar absorbing glass, contact the appropriat
4、e Materials Engineer. All interior materials are developed to be used in vehicles with solar glass; therefore, the performance may be compromised if used in non-solar glass vehicles. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standar
5、ds/Specifications. ISO 105-A02 ISO 105-B06 ISO 1431-1 ISO/IEC 17025 ISO 105-A03 ISO 105-X12 ISO 9001 2.2 GM Standards/Specifications. GMW3010 GMW3221 GMW3417 GMW14124 GMW3059 GMW3232 GMW6992 GMW14141 GMW3116 GMW3235 GMW8081 GMW14162 GMW3205 GMW3259 2.3 Additional References. TMC003 Material Safety D
6、ata Sheet guidance documents (available at ). 3 Requirements 3.1 Requirements on Test Specimens. 3.1.1 Standard Conditions (GMW3221, Code A). All test specimens shall be conditioned to GMW3221, Code A, unless the test method indicates that standard conditioning is not required. If specimens are test
7、ed outside of the conditioned environment, they shall be tested within 10 minutes of removal. 3.1.2 Sampling and Test Specimen Preparation. All test specimens shall be taken from the area beyond the initial 1 m of production. Prepare test specimen as required in the respective test method. 3.1.3 Vis
8、ual Evaluation of Automotive Trim (GMW6992). The color, pattern, aesthetics and other related qualities shall be evaluated and approved by the responsible engineering department as an acceptable match to the engineering approval sample when viewed under conditions set forth in GMW6992. 3.1.4 Deviati
9、on from Defined Test Methods. Deviations from the conditions of any test method shall be agreed upon between supplier and vehicle manufacturer. All deviations shall be specified on the component drawings, material specifications, and Statement of Requirements and shall be indicated as such on test c
10、ertificates and reports. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15014 Copyright 2012 General Motors Company All Rights Reserved
11、June 2012 Page 2 of 11 3.1.5 Documentation and Test Data. Samples of components or material released to this specification shall be tested for conformity with the requirements of this specification and approved by the responsible GM department prior to the start of delivery of production level mater
12、ials. Lab testing shall be performed by a laboratory that conforms to ISO/IEC 17025 or ISO 9001 or other third party accreditation and is acceptable to the GM Materials Engineer. Supplier shall submit documentation showing proof of accreditation. 3.2 Construction Requirements. These requirements des
13、cribe the initial testing to be completed when a new construction is being considered. For a complete construction package, 3.3 must also be completed on a representative color. 3.2.1 Geometric Shape/Size. Report the average length of 5 repeats of pattern in the Machine Direction (MD) with net elong
14、ated by a 22 N load in the same direction. For example, the 22 N load may be established by setting up the test piece in the tensile machine (according to GMW3010) for elongation testing with a pre-load of 22 N. 3.2.2 Yarn Count. The construction (machine and across machine direction) shall conform
15、to the engineering approval sample with the following allowable tolerances. Machine direction count: 1% Cross machine direction count: 3% 3.2.3 Tensile Strength and Elongation (GMW3010). Established values for a construction will be reported on and controlled within the limits established on the con
16、struction specification form. The test specimen shall be cut so that at minimum, one net hole is complete (see Figure 1). In deviation to GMW3010, a special clamping device (see Figure 2) is used, that has two half pins which are inserted into the net hole. Under preload of 1 N, the half pins shall
17、be in a distance of 10 mm of each other. The net shall be tested in Direction 1 and Direction 2. Figure 1: Elongation Test Piece Di rect io n 1Di rect io n 2Tes t P i e c eCopyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or netwo
18、rking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15014 Copyright 2012 General Motors Company All Rights Reserved June 2012 Page 3 of 11 Note: All dimensions in millimeters Figure 2: Elongation Clamping Device 3.2.3.1 Elongation. Elongation is to be measured at 44 N;
19、 refer to the construction specification form for the requirement. In addition, report elongation at 25 N, 50 N, 100 N, and at break; or include a force-elongation chart for information only. 3.2.3.2 Tensile Strength. The minimum breaking strength shall be 250 N. 3.2.4 Resistance to Mildew (GMW3259)
20、. This test is required whenever a new fiber, finishing agent, resin, or combination thereof is introduced. Tested net shall have no visible growth of mildew and no objectionable odor. 3.2.5 Resistance to Odor (GMW3205). This test is required whenever a new fiber, finishing agent, resin, or combinat
21、ion thereof is introduced. Tested net shall have a rating of 6 or higher. Use a test specimen of 3 g 0.1 g with a desiccator of 2700 cm volume (2.7 L). 3.2.6 Ozone Resistance (ISO 1431-1). For elastic materials only. The material shall be elongated 25% and held in this condition while exposed for 24
22、 h to air at 40 C 2 C containing 100 pphm 10 pphm ozone. At the completion of the test, the material must not show signs of breakdown, deterioration, or degradation. If visual evaluation is acceptable, the elongation shall be measured. The change of elongation shall be 5% maximum compared to the val
23、ues of the net as received. 3.2.7 Flammability (GMW3232). 3.2.7.1 After Conditioning (GMW3232). Immediately prior to tests, all test specimens shall be conditioned for a minimum of 24 h according to GMW3221, Code A. 3.2.7.2 After Aging (GMW3232). In addition to tests conducted in the as received con
24、dition, all materials shall additionally be tested for flammability after the following artificial condition: The test cycle shall commence with 48 h 1 h at 40 C 3 C and 93% 5% relative humidity followed by 168h 1 h at 90 C 3 C and completed without interruption. Repeat conditioning before starting
25、testing flammability. 3.3 Color Properties. These requirements describe the testing to be completed with each new color being considered for an approved construction. Any new color shall meet all construction properties and conform to the original Construction Specification Form. Note: Materials usi
26、ng a common solution dyed fiber need only one set of color data relating to the fiber. Mesh nettings made from common solution dyed fiber are assumed to have similar color properties for 3.3.1, 3.3.2, 101410Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot
27、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15014 Copyright 2012 General Motors Company All Rights Reserved June 2012 Page 4 of 11 3.3.3, 3.3.4, 3.3.5 and 3.3.6. Note that 3.3.7 and 3.3.8 must be completed for each specific co
28、nstruction in each color. Also piece dyed materials must have complete color testing results for each color and construction. 3.3.1 Colorfastness to Artificial Light. The procedure and requirement will be defined on the Construction Specification Sheet or by approving region. The requirement is 4 or
29、 better per ISO 105-A02 Grey Scale for color change. A noticeable value (lightness) and/or chroma (saturation) change with minimum hue change is acceptable. Evaluate specimens as specified in GMW6992. Polystyrene reference plastic or blue wool is to be used to verify the xenon arc apparatus. 3.3.1.1
30、 Xenon Method ISO 105-B06, Condition 5. Table 1: Requirements for Xenon Method ISO 105-B06, Condition 5 Application Requirement (kJ/m2) Overhead, floor, non exposed cargo area 150.4 Pillars 225.6 Seating/doors 338.6 IP, Rear window trim, exposed cargo area 451.2 3.3.1.2 Xenon Method (GMW14162, Cycle
31、 B, 100 C, 300 nm to 400 nm). Table 2: Requirements for Xenon Method (GMW14162, Cycle B, 100 C, 300 nm to 400 nm) Application Requirement For Information Overhead, floor, non exposed cargo area 14 MJ/m 28 MJ/m Pillar, seating/doors 28 MJ/m 42 MJ/m 3.3.1.3 Xenon Method (GMW14162, Cycle C, 115 C). Tab
32、le 3: Requirements for Xenon Method (GMW14162, Cycle C, 115 C) Application Requirement For Information IP, rear window trim, exposed cargo area 19 MJ/m 38 MJ/m 3.3.2 Natural Weathering Exposure, GMW3417 U/G-TSTL-XX. No greater than a noticeable value (lightness) and or chroma (saturation) change wit
33、h minimum hue change is acceptable. Evaluate specimens as specified in GMW6992. See Table 4. Note: Non-solar glass vehicles revert to regional requirement. 3.3.3 Color Crocking (ISO 105-X12). The results shall be 4 or greater when compared to the ISO 105-A03 Grey Scale for staining. Perform 10 strok
34、es fore and aft for both wet and dry. 3.3.4 Dye Migration (GMW14141). The results shall 4 or greater when compared to the ISO 105-A02 Grey Scale for color change. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking per
35、mitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15014 Copyright 2012 General Motors Company All Rights Reserved June 2012 Page 5 of 11 Table 4: Requirements for Natural Weathering Exposure, GMW3417 U/G-TSTL-XX Application Temperature (C) Requirement (NR kL) Information Only
36、 (NR kL) IP; exposed cargo area, rear window trim 102 105 000 IP lower, consoles, garnish 93 75 000 Seating/door 85 40 000 105 000 for degradation Pillars 85 37 500 Overhead, floor, non exposed cargo area 85 10 000 37 500 3.3.5 Dimensional Stability (GMW14124, Cycle M Performed Twice). The material
37、must withstand the environmental exposure with no objectionable visual changes. Visual observations shall include changes in, color or gloss, wrinkling, sagging, staining, haptic, or other undesirable effects. The high temperature is to be 85 C. 3.3.6 Fogging (GMW3235, Code B Gravimetric). Report th
38、e average fog number for 3 specimens. The weight change of the used aluminum foil shall be no greater than 1.5 mg. The bath temperature is to be +90 C. 3.3.7 Flammability (GMW3232). 3.3.7.1 After Conditioning (GMW3232). Immediately prior to tests, all test specimens shall be conditioned for a minimu
39、m of 24 h according to GMW3221, Code A. 3.3.7.2 After Aging (GMW3232). In addition to tests conducted in the as received condition, all materials shall additionally be tested for flammability after the following artificial condition: The test cycle shall commence with 48 h 1 h at 40 C 3 C and 93% 5%
40、 relative humidity followed by 168 h 1 h at 90 C 3 C and completed without interruption. Repeat conditioning before starting testing flammability. 3.3.8 Interior Emissions (GMW8081). The relative emission shall be 1.5. 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 Legal Regulat
41、ions. All materials must satisfy applicable laws, rules, regulations and recommendations valid in the country of usage. 5.2 Language. In the event of conflict between the English and domestic language, the English language shall take precedence. 5.3 Inspection and Rejection. Samples of components or
42、 materials released to a GM material specification shall be tested for conformity with the requirements of this material specification and approved by the responsible Engineering department prior to commencement of delivery of bulk supplies. A new approval must be received for any changes, e.g., pro
43、perties, manufacturing process, location of manufacture, etc. If not otherwise agreed, all testing and documentation normally required for initial release must be completed. It is the responsibility of the supplier to inform the customer in a timely manner, without solicitation, and to include docum
44、entation of all modifications of materials and/or processes and to apply for a new release. If not otherwise agreed, all release tests shall be repeated and documented by the supplier prior to commencement of delivery of non-conforming bulk supplies. In individual cases, a shorter test can be agreed
45、 to between the responsible Engineering department and the supplier. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15014 Copyright 2012
46、 General Motors Company All Rights Reserved June 2012 Page 6 of 11 5.4 Initial Source Approval. No shipments shall be made by any supplier until representative initial production samples have been approved by the appropriate Materials Engineering department(s) as meeting the requirements of this spe
47、cification. 5.5 Material Safety Data Sheets/Safety Data Sheets (MSDS/SDS). For new product submissions, or when a change in chemical composition of an existing product has occurred, a complete copy of the Material Safety Data Sheet/Safety Data Sheet must be submitted in compliance with the Globally
48、Harmonized System of Classification and Labeling of Chemicals (GHS) requirements or other country-specific MSDS/SDS requirements. In addition, product MSDS/SDS submissions must be in compliance with specific country General Motors TMC003 Material Safety Data Sheet/Safety Data Sheet guidance document
49、s where available. 5.6 All materials supplied to this standard must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 5.7 Recycling Guidelines (GMW3116). All materials developed to this specification shall be optimized to provide maximum end-of-life cycle value utilizing the Vehicle Recyclability/ Recoverability Calcula
