1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16903 Protective Fabric Covers for Vehicles Copyright 2013 General Motors Company All Rights Reserved August 2013 Page 1 of 4 1 Scope 1.1 Material Description. This specification details the properties of fabric materials used in vehicle cov
2、ers. The fabrics are textile materials that are knit, woven, non-woven, or non-conventional in structure. 1.2 Symbols. Not applicable. 1.3 Typical Applications. These covers are used to protect the exterior finish of the vehicle while in storage. 1.4 Remarks. There are two types of vehicle protectiv
3、e covers. Type I is for covers designed for outdoor storage, and Type II is for covers designed primarily for protected or indoor vehicle storage. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 105-A03 ISO 4
4、892-1/2 ISO 9001 SAE J2527-A ISO 105-X12 ISO 5084 ISO/IEC 17025 2.2 GM Standards/Specifications. GMW3010 GMW3211 GMW3326 GMW6992 GMW3059 GMW3221 GMW4217 GMW14102 GMW3182 GMW3259 GMW4726 GMW14124 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requir
5、ements 3.1 Requirements on Test Specimens. Reference GMW3221. 3.1.1 Standard Conditions (GMW3221-A). All test specimens shall be conditioned to GMW3221, Code A, for a minimum of 24 h, unless the test procedure indicates that standard conditioning is not required or that other conditions apply. 3.1.2
6、 Sampling and Test Specimen Preparation. All test specimens shall be taken from the area beyond the initial 2 m of production and at least 50 mm from either selvage edge. Prepare test specimen as required in the respective test procedure. 3.1.3 Visual Evaluation of Automotive Trim (GMW6992). The col
7、or, 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 Deviation from Defined Test Procedures. Deviations from the
8、 conditions of any test procedure shall be agreed upon between supplier and vehicle manufacturer. All deviations shall be specified on the component drawings, material construction specification form, and Statement of Requirements and shall be indicated as such on test certificates and reports. 3.1.
9、5 Documentation. 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 components or materials. 3.1.5.1 Any change to
10、 the component or material, e.g., design, function, properties, manufacturing process and/or location of manufacture, requires a new release of the product. It is the sole responsibility of the Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo
11、 reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16903 Copyright 2013 General Motors Company All Rights Reserved August 2013 Page 2 of 4 supplier to provide the customer, unsolicited, with documentation of any change or modification to the prod
12、uct/process, and to apply for a new release. 3.1.5.2 If not otherwise agreed to, the entire verification test shall be repeated and documented by the supplier prior to start of delivery of the modified or changed product. In some cases a shorter test can be agreed to, between the responsible GM depa
13、rtment and the supplier. 3.1.6 Lab Accreditation. Lab testing shall be performed by a laboratory that conforms to ISO/IEC 17025 or ISO 9001 and is acceptable to the responsible GM engineer. Supplier shall submit documentation showing proof of accreditation. 3.2 Construction Requirements for all Appl
14、ications. These requirements describe the initial testing to be completed for a new fabric construction. Requirements for Type I and Type II applications are listed in Table 1. 3.2.1 Weight (GMW3182). Report the average in gram per meter squared (g/m2) for the fabric weight and the total weight if l
15、aminated. Acceptable production tolerances shall be 6%, unless otherwise stated on the component drawing. 3.2.2 Thickness (ISO 5084). Report the average for three specimens in millimeters (mm) to the nearest 0.01 mm. Use a 2.0 N load and a 50.5 mm diameter presser foot to achieve a pressure of 1.0 k
16、Pa. For foam laminates, use a 4.0 N load and a 200 mm 0.8 mm diameter presser foot to achieve a pressure of 0.127 kPa. All readings should be taken after the presser foot has been in contact with the material for at least 5 s. Acceptable production tolerance will be 10% for fabric materials unless o
17、therwise specified on the construction drawing. 3.2.3 Tensile Strength (GMW3010 Code A). Test three specimens each from the Machine Direction (MD), Cross Machine Direction (CMD), and bias left and bias right directions. Report the average tensile strength at break. 3.2.4 Tear Strength, Trapezoid Tea
18、r (GMW3326). Test three specimens from the MD and three specimens from the CMD. Report the average for each direction in newtons (N). 3.2.5 Stretch and Set (GMW3211). Test three specimens from the MD and three from the CMD. Report the average for each direction. The maximum allowable stretch is 25%;
19、 the maximum allowable set is 4%. 3.2.6 Crocking (ISO 105-X12). The results shall be 4 when compared to the ISO Grey Scale for Staining, ISO 105-A03, after ten strokes back and forth for both wet and dry conditions. For wet testing, use a 65% 5% wet pick up of the crocking cloth. 3.2.7 Water Spottin
20、g (GMW14102). Specimen size shall be 400 mm x 400 mm. Amount of water used shall be 5.0 mL. Perform the water spotting procedure three times on the same area, allowing the specimen to dry for at least 24 h after each application of water. Evaluate after each drying process and report the most notice
21、able results. No staining, ring formation or haptic change is allowed. If the water wicks to the edge, increase the specimen size. 3.2.8 Mildew (GMW3259). There shall be no visible growth or odor of mildew. 3.2.9 Dimensional Stability (GMW4217 and GMW14124, Cycle M). Dimensional change shall be 1.5%
22、 in the MD and CMD. The specimen shall exhibit a satisfactory rating which is no degradation or no delamination of the layers, foam, or film. 3.2.10 Water Repellency (GMW4726). Report the water repellency; the requirement is 8 or higher. 3.2.11 Color Fastness to Artificial Light, Xenon Arc Method (S
23、AE J2527-A or ISO 4892-1/2). Exposure to Xenon Arc Weatherometer, extended ultraviolet (UV) filters. Report E after indicated exposure in Table 1. Table 1: Construction Requirements Test Class Test Procedure Units Requirement Type I Type II Weight GMW3182 g/m2 Report Report Thickness ISO 5084 mm Rep
24、ort Report Tensile Strength GMW3010 N 200 150 Tear Strength GMW3326 N 100 minimum 100 minimum 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 STANDARD
25、S GMW16903 Copyright 2013 General Motors Company All Rights Reserved August 2013 Page 3 of 4 Test Class Test Procedure Units Requirement Type I Type II Stretch GMW3221 % 25 maximum 25 maximum Crocking ISO 105-X12 ISO Grey Scale 4 4 Water Spotting GMW14102 - No change No change Mildew GMW3259 - No od
26、or or growth No odor or growth Dimensional Stability GMW4217, GMW14124, Cycle M % 1.5 maximum 1.5 maximum Water Repellency GMW4726 - 8 minimum 5 minimum Color Fastness to Artificial Light SAE J2527-A E 3 after 1000 kJ exposure 3 after 500 kJ exposure 4 Manufacturing Process Not applicable. 5 Rules a
27、nd Regulations 5.1 Legal Regulations. 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 Rej
28、ection. Samples of components or 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 rec
29、eived for any changes, e.g., properties, 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 so
30、licitation, and to include documentation 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 cas
31、es, a shorter test can be agreed to between the responsible Engineering department and the supplier. 5.4 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 Materi
32、al Safety Data Sheet/Safety Data Sheet must be submitted in compliance with the Globally 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 cou
33、ntry General Motors TMC003 Material Safety Data Sheet/Safety Data Sheet guidance documents where available. 5.5 All materials supplied to this standard must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 6 Approved Sources Materials supplied to this specific
34、ation must be approved by General Motors. A list of approved materials can be found in MATSPC. This GM Material File is provided to third parties to reduce redundant testing of materials. If approved material already listed is used, the part supplier can use GM Material File reference for Production
35、 Part Approval Process (PPAP) material approval. If the decision is made 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 GMW16903 Copyright
36、2013 General Motors Company All Rights Reserved August 2013 Page 4 of 4 to use a not yet approved material, contact GM Materials Engineering for detail on the approval process. The material approval process must be completed prior to PPAP start date of the part supplied to General Motors. 7 Notes 7.
37、1 Glossary. MATSPC: Global repository of GM approved materials for corresponding GM Engineering Standards. 7.2 Acronyms, Abbreviations, and Symbols. CMD Cross Machine Direction GHS Globally Harmonized System of Classification and Labeling of Chemicals MD Machine Direction MSDS Material Safety Data S
38、heet PPAP Production Part Approval Process SDS Safety Data Sheet UV Ultraviolet 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW16903 9 Release and Revisions This standard was originated in December 2012. It was first approved by the
39、Textiles & Trim Materials Global Subsystem Leadership Team in August 2013. It was first published in August 2013. Issue Publication Date Description (Organization) 1 AUG 2013 Initial publication. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
