1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW15015 Elastic and Non-Elastic Cords, Straps, and Bindings Copyright 2012 General Motors Company All Rights Reserved June 2012 Originating Department: North American Engineering Standards Page 1 of 9 1 Scope 1.1 Material Description. This spe
2、cification describes materials suitable as cording used for map pockets, convenience nets, storage nets and parcel shelves, as well as pull straps and tie down straps. Cording material shall be knitted or braided and may be elastic or non-elastic. Webbing materials are typically woven and could be e
3、lastic and non-elastic. All materials shall be made from man-made fibers colored and finished to acceptable color, pattern, and physical properties. 1.2 Symbols. A unique finish symbol will be given to each construction by the responsible GM representative at initial development. 1.3 Typical Applica
4、tions. 1.3.1 Elastic cords surrounding mesh fabric map pockets or surrounding convenience nets in occupant area or trunks of the vehicle. 1.3.2 Non-elastic straps to support the rising of the rear parcel shelf when opening the luggage compartment and pull straps to engage the folding seat feature. 1
5、.3.3 Binding material used for binding the floor mats. The material can consist of woven webbing tape, or vinyl rolled goods. 1.3.4 Elastic Webbing materials are suitable for sunshade straps, and map pockets. The material shall be an elastic fabric with its stretch in warp direction only. The classi
6、fication of this material is as follows. Type I: High tensile and high elongation at break and it is used for sunshade straps. Type II: Low tensile and low elongation for miscellaneous uses such tie downs. Type III: Medium tensile and high elongation and it is used for map pockets 1.4 Remarks. For r
7、equirements for vehicles without solar absorbing glass, contact the appropriate 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 appr
8、oved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 105-A02 ISO 105-B06 ISO 1431-1 ISO 105-A03 ISO 105-X12 ISO 9001 2.2 GM Standards/Specifications. GMW3010 GMW3208 GMW3259 GMW14125 GMW3059 GMW3221 GMW3417 GMW14141 GMW3116 GMW3232 GMW6992 GMW14162 GMW
9、3205 GMW3235 GMW14124 GMW15634 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,
10、-GM WORLDWIDE ENGINEERING STANDARDS GMW15015 Copyright 2012 General Motors Company All Rights Reserved June 2012 Page 2 of 9 3 Requirements 3.1 General Requirements. 3.1.1 Standard Conditions (GMW3221). All test specimens shall be conditioned to GMW3221 Code A, unless the test method indicates that
11、standard conditioning is not required. If specimens are tested 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 s
12、pecimen as required in the respective test method. 3.1.3 Visual 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
13、 viewed under conditions set forth in GMW6992. 3.1.4 Deviation 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 Statem
14、ent of Requirements and shall be indicated as such on test certificates and reports. 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 depar
15、tment prior to the start of delivery of production level materials. 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 accred
16、itation. 3.2 Material Construction Specification. All required information shall be reported on the construction specification form, Appendix A. Not applicable items on form must fill in with Not Applicable (N/A). Established values for a construction will be reported on and controlled within the li
17、mits established on the Construction Specification Form. 3.2.1 Yarn Count. For woven webbing only. The construction (machine and across machine direction) shall conform to the engineering approval sample with the following allowable tolerances. Machine direction count: 1%. Cross machine direction co
18、unt: 3%. 3.2.2 Tensile Strength and Elongation (GMW3010). Established values for a construction will be reported on and controlled within the limits established on the Construction Specification Form. Test set up as described for threads and yarns in GMW3010. 3.2.2.1 Elongation. Elongation is to be
19、measured at 44 N, 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. For elastic webbing the elongation value shall be 125% for Type I, 50% for Type II and 110%
20、 for Type III. 3.2.2.2 Tensile Strength. The minimum breaking strength shall be 500 N for binding applications; the minimum 200 N is required. 3.2.3 Resistance to Mildew (GMW3259). This test is required whenever a new fiber, finishing agent, resin, or combination thereof is introduced. There shall b
21、e no visible growth of mildew and no objectionable odor. 3.2.4 Resistance to Odor (GMW3205). Report both wet and dry results. Use a ratio of specimen size to container volume of 1:50. A ratio of 6 and higher is required. 3.2.5 Flammability (GMW3232). 3.2.5.1 After Conditioning (GMW3232). Immediately
22、 prior to tests, all test specimens shall be conditioned for a minimum of 24 h according to GMW3221 Code A. 3.2.5.2 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
23、: The test cycle shall commence with 48 1 h at 40 C 3 C and 93 5% relative humidity followed by 168 1 h at 90 C 3 C and completed without interruption. Repeat conditioning before starting testing flammability. Copyright General Motors Company Provided by IHS under license with General Motors Company
24、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15015 Copyright 2012 General Motors Company All Rights Reserved June 2012 Page 3 of 9 3.2.6 Fogging (GMW3235). Gravimetric Method. Using Method B, report the average of three spec
25、imens. The weight change of the used aluminum foil shall be no greater than 2 mg. For the materials used for the parts with high heat and solar exposure, use for bath 110 C and for the rest of locations, use 90 C. 3.2.7 Determination of Volatile and Semi-Volatile Organic Compounds (GMW15634). Volati
26、le Organic Compounds shall be no greater than 150 g/g. Semi-Volatile Organic Compounds shall be no greater than 300 g/g. 3.2.8 Ozone Resistance (ISO 1431-1). For elastic materials only. The material shall be elongated 25% and held in this condition while exposed for 24 h to air at 40 C 2 C containin
27、g 100 10 parts per million (ppm) 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 as received value. Th
28、e following tests will be required only for Vinyl Rolled Good Binding. 3.2.9 Environmental Cycle (GMW14124 Cycle M 2 cycle). Report any change in appearance, or shrinkage. 3.2.10 Abrasion Resistance (GMW3208), CS-10 Wheel, 500 g Loads, 500 Cycles. Prior to evaluation, use cotton cloth per ISO 105-A0
29、3, moistened with distilled water to clean the surface of the abraded specimen. Allow to air dry. There shall be no objectionable changes in gloss color or grain when viewed at 45 degree angle using illuminant D65. 3.2.11 Scuffing and Marring (GMW14125 Code HX6). Slight marring and no scuffing are a
30、cceptable. 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 sheet. Note: Materials using a commo
31、n solution dyed fiber need only one set of color data relating to the fiber. Nets, straps, and elastic cords made from common solution dyed fiber are assumed to have similar color properties for 3.3.1, 3.3.2, 3.3.3, 3.3.4, 3.3.5, and 3.3.6. Note: 3.3.7 and 3.3.7.1 must be completed for each specific
32、 construction 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
33、four (4) or 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 apparat
34、us. 3.3.1.1 Xenon Method ISO 105-B06, Condition 5. See Table 1. Table 1: Requirements for Xenon Method ISO 105-B06, Condition 5 Application Requirement (kJ/m2) Elastic Webbing Type I and II 75.2 Type III 150.4 Overhead, Floor, non-exposed cargo area 112.8 Pillars 225.6 Seating/Doors 338.6 IP, Rear W
35、indow Trim, Exposed Cargo Area 451.2 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 GMW15015 Copyright 2012 General Motors Company All Righ
36、ts Reserved June 2012 Page 4 of 9 3.3.1.2 Xenon Method (GMW14162, Cycle B, 100 C, 300 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
37、28 MJ/m 42 MJ/m 3.3.1.3 Xenon Method (GMW14162, Cycle C, 115 C). Table 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 No greater than a noticeable
38、value (lightness) and or chroma (saturation) change with minimum hue change is acceptable. Evaluate specimens as specified in GMW6992. Note: Non solar glass vehicles revert to regional requirement. Table 4: Requirements for Natural Weathering Exposure, GMW3417 Application Temperature (C) Requirement
39、 (TNR kL) Information Only (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 15 000 3.3.3 Color Crocking (ISO 105-X12). The results sha
40、ll be four (4) or greater when compared to the ISO 105 A03 grey scale for staining. Perform 10 strokes, fore and aft cycle, for both wet and dry. 3.3.4 Dye Migration (GMW14141). The results shall be four (4) or greater when compared to the ISO 105-A2 grey scale for color change. 3.3.5 Dimensional St
41、ability (GMW14124, Cycle M performed twice). The material must withstand the environmental exposure with no objectionable visual changes. Visual observations shall include changes in color or gloss, warping, wrinkling, sagging, staining, haptic, or other undesirable effects. The high temperature is
42、to be + 85 C. 3.3.6 Fogging (GMW3235, Code B Gravimetric). Report the average fog number for three specimens. The weight change of the used aluminum foil shall be no greater than 2 mg. The bath temperature is to be +90 C. 3.3.7 Flammability (GMW3232). 3.3.7.1 After Conditioning (GMW3232). Immediatel
43、y prior to tests all test specimens shall be conditioned for a minimum of 24 h according to GMW3221 Code A. 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 ENGINE
44、ERING STANDARDS GMW15015 Copyright 2012 General Motors Company All Rights Reserved June 2012 Page 5 of 9 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. T
45、he test cycle shall commence with 48 1 h at 40 C 3 C and 93 5% relative humidity followed by 168 1 h at 90 C 3 C and completed without interruption. Repeat conditioning before testing flammability. 4 Manufacturing Process Not applicable. 5 Rules and Regulations 5.1 Legal Regulations. All materials m
46、ust 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 materials released t
47、o 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., properties, manufacturin
48、g 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 documentation of all modif
49、ications 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 to between the responsible Engineering department and the supplier. 5.4 Initial Source Appr
