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1、 WORLWIDE ENGINEERING STANDARDS General Specification Interior GMW14194 Fibrous Sound Absorption Materials Copyright 2006 General Motors Corporation All Rights Reserved February 2006 Originating Department: North American Engineering Standards Page 1 of 2 1 Introduction 1.1 Scope. This specification
2、 identifies all types of sound absorbing and/or sound dissipative materials used in vehicles. 1.2 Mission/Theme. Products qualified to this specification shall be identified by their general composition and areas in a vehicle where they will yield their best acoustical performance. 1.3 Classificatio
3、n. All materials qualified to this specification shall be listed by type and recommended areas of the vehicles to be used. 1.3.1 Type 1 - Textile Fibers (Non-wovens). These type materials will contain a blend of fibrous materials that may be bound together by needling or bonding. Type 1 materials ar
4、e recommended for usage in the vehicle interiors or other areas where exposure to moisture and exterior exposure is very limited. For example these materials can be used for under carpet applications These materials can also withstand higher heat applications and can be used in the engine compartmen
5、t. 1.3.2 Type 2 Fiberglass. Fiberglass and other phenolic cured materials for use underhood use only and not for interior applications. Type 2 materials are recommended for exterior or underhood locations where performance and exposure to chemicals will have an insignificant effect on performance. A
6、ll fiberglass constructions shall have cut edges compressed around the entire circumference and the components shall not have any extractable constituents being offensive, detrimental to health, or causing malfunctions during assembly or vehicle operation. Not to be used for front of dash or interio
7、r applications. 1.3.3 Type 3 - 100% Polypropylene Fibers. This material will be composed of 100% fibrous polypropylene. Type 3 materials are recommended for areas where exposure to moisture will have an insignificant effect on performance. Not recommended for front of dash applications. 1.3.4 Type 4
8、 100% Polyester Fibers. These materials will be composed of 100% PET fibers. Type 4 materials are recommended for areas where exposure to moisture will have an insignificant effect on performance. 1.3.5 Type 5 Fiber Blends. Type 5 materials are recommended for areas where exposure to moisture will h
9、ave an insignificant effect on performance. Not recommended for front of dash applications. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. FMVSS 302 ISO 2589 ISO 354 2.2 GM Standards/Specifications. GM9193P GMW3
10、205 GM9635P GMW3232 GME 60349 GMW3235 GMW3001 GMW3259 GMW3059 GMW14124 GMW3182 3 Requirements 3.1 Product Characteristics. Mass per unit area, per GMW3182, and thickness, per ISO 2589, of all materials for this specification shall be called out on the engineering drawing or the math files. 3.1.1 Int
11、ernal Bond Strengths. 3.1.1.1 Internal bond strengths of needled or non- woven fibrous materials shall be no less than 20 N/cm when tested to GME 60349. 3.1.1.2 Internal bond strength of resinated needled fibers to be at 30 N/m when tested to GME 60349. 3.1.1.3 Internal bond strength of molded fiber
12、glass shall be 3N when tested per GM9193P. 3.1.2 Performance Requirements. Suppliers must provide to GM materials engineering data of their fibrous materials per ISO 354, alpha cabin testing or any other reverberation room testing. Further acoustical analysis of products already qualified to this sp
13、ecification shall be determined via SEA analysis. GMW14194 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corporation All Rights Reserved Page 2 of 2 February 2006 3.3 Odor (GMW3205). Report both wet and dry results. Rating of 6 minimum. 3.4 Flammability (GMW3232). Must comply to F
14、MVSS 302. Test to GMW3232. Note: If the material is a composite or is to be used in a composite, the composite must meet this requirement. 3.5 Mildew (GMW3259). Required only if natural fibers are present in the construction. There shall be no visible growth or odor of mildew. 3.6 Fogging (GMW3235).
15、 Method A, code T1. Report the average of the 5 reflectance values. A Reflectance value of 90 minimum with either a dry uniform or non-uniform film is required. Specimens that form crystals, an oily film, or discernable droplets 0.05 mm in diameter at 40X magnification do not meet this requirement.
16、3.7 There shall be no deterioration of performance of Types 1, 2, and 4 fibrous materials used in or adjacent to engine compartment applications. Types 1, 2, and 4 materials must withstand 20 cycles of GMW14124 cycle R. 3.7.1 Resistance to Chemicals. Fibrous materials used in engine compartment shal
17、l not breakdown or show degradation of acoustic performance when exposed to the following chemicals: Transmission fluid Gasoline/alcohol blend Diesel Fuel Coolant Motor oil Windshield Washer Fluid Brake Fluid Power steering fluid Sulfuric Acid 10% or battery acid Grease (Shell Vaseline 8401) Note: R
18、egional specifications will apply due to variations in requirements between regions. 3.8 Dust (GM9635P). All fibrous materials must have less than 1% dust when tested to GM9635P. 4 Validation Not applicable. 5 Provisions for Shipping Not applicable. 6 Notes 6.1 Glossary. Not applicable. 6.2 Acronyms
19、, Abbreviations, and Symbols. Not applicable. 7 Additional Paragraphs 7.1 All materials supplied to this specification must comply with the requirements of GMW3001, Rules and Regulations for Materials Specifications. 7.2 All materials supplied to this specification must comply with the requirements
20、of GMW3059, Restricted and Reportable Substances for Parts. 8 Coding System This specification shall be referenced in other documents, drawings, VTS, CTS, etc. as follows: GMW14194 Type X Where: X indicates type of fiber used as referenced in section 1.3.1.1 9 Release and Revisions 9.1 Release. This general specification originated in June 2005, replacing TM227400, TM373700, TM153600, TM223800, GM2226M, GM2227M, GM2213M, GM2722M, GMN10034. It was first approved by the Global Acoustics Team in February 2006. It was first published in February 2006. -,-,-