1、 WORLDWIDE ENGINEERING STANDARDS General Specification GMW14147 Requirements for Expanded Elastomeric Body Seals Copyright 2012 General Motors Company All Rights Reserved May 2012 Originating Department: North American Engineering Standards Page 1 of 10 1 Introduction Note: Nothing in this standard
2、supercedes applicable laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Scope. This standard covers the requirements of expanded elastomeric rubber seals attached to a solid carrier used in sealing body ope
3、nings. 1.2 Mission/Theme. Not applicable. 1.3 Classification. 1.3.1 Material Description. The bulb or sealing portion of the weatherstrips shall be made from expanded closed-cell ethylene propylene diene monomer (EPDM) rubber. For attachment purposes, weatherstrips require a dense base (carrier). Th
4、is carrier shall be coextruded with the expanded cellular bulb. The carrier shall incorporate a metal insert if specified on the respective part drawing. The specifications for the dense base and the metal carrier shall be specified on the engineering part drawing or in the math data file. Weatherst
5、rip assemblies shall consist of continuous extruded sections or sections joined together. These sections shall be joined by either transfer or injection molded corners, or mitered corners securely attached with suitable adhesive. Joint and corner offsets in visible and sealed areas must be less than
6、 or equal to 0.25 mm. 1.3.2 Coatings. When applied, coatings shall be non-abrasive and uniform in color, finish, and texture. Coatings must meet the requirements of color and gloss as established by GM Appearance Engineering. 1.3.3 Typical Applications. Typical applications include the following: se
7、aling profiles in the body area, e.g., on doors, tailgates, and trunk lids. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. AATCC 23 ISO 845 ISO 3865 ISO 9513 ISO 105-B06 ISO 1431-1 ISO 4892 ISO 23529 ISO 105-G02
8、 ISO 2781 ISO 7500-1 SAE J2527 ISO 188 2.2 GM Standards/Specifications. GMW3059 GMW14650 GMW14757 GMW15564 GMW14125 GMW14685 GMW15379 GMW15681 GMW14162 GMW14711 GMW15381 GMW16317 GMW14170 GMW14712 GMW15382 GMW16321 GMW14294 2.3 Additional References. KPAC MATBWS-3, Weatherstrips - Rear End Closures
9、- Glass Sealing - Compatibility with Heated Backlight Element. Weatherstrip Component Technical Specification - CG1019. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORL
10、DWIDE ENGINEERING STANDARDS GMW14147 Copyright 2012 General Motors Company All Rights Reserved May 2012 Page 2 of 10 3 Test Preparation and Evaluation 3.1 Resources. 3.1.1 Calibration. The test facilities and equipment shall be in good working order and shall have a valid calibration label. 3.1.2 Al
11、ternatives. Alternative test facilities and equipment may also be used. 3.1.3 Facilities. Facilities shall conform to the relevant Test Procedures. 3.1.4 Equipment. Equipment shall conform to the relevant Test Procedures and to the test sketches on the part drawings. 3.1.4.1 Test Machine. The test m
12、achine shall fulfill the following requirements: the force-measuring device of the test machine shall correspond to ISO 7500-1 Class 1; the deflection measuring device shall correspond to ISO 9513 Class 0.2. The test machine shall be such that the required test velocity can be maintained. 3.1.5 Test
13、 Vehicle/Test Piece. Unless otherwise specified, the shape, size and number of test pieces shall be in accordance with the relevant Test Procedure. For Design and Product Validation, test pieces shall be cut from at least three finished parts, and for Routine Quality Control from at least one finish
14、ed part. See Appendix A, Table A1. The number of test pieces required is defined in the Weatherstrip Component Technical Specification (CG1019). 3.1.6 Test Time. Not applicable. 3.1.7 Test Required Information. Not applicable. 3.1.8 Personnel/Skills. Not applicable. 3.2 Preparation. Not applicable.
15、3.3 Conditions. 3.3.1 Environmental Conditions. The minimum time between vulcanization and testing of elastomers shall be 72 h. The test pieces shall be maintained at a temperature of 23 C 5 C for at least 8 h prior to test and shall be free from strain during this period. 3.4 Instructions. Not appl
16、icable. 3.5 Data. Not applicable. 3.6 Safety. This standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and
17、 health practices and determine the applicability of regulatory limitations prior to use. 3.7 Documentation. Samples of components or material released to this standard shall be tested for conformity with the requirements of this standard and approved by the responsible GM department (GM Product Eng
18、ineering, Materials Engineering, Appearance Engineering, and/or Validation Engineering) prior to the start of delivery of production level components or materials. Any change to the component or material, e.g., design, function, properties, manufacturing process and/or location of manufacture requir
19、es a new release of the product. It is the sole responsibility of the supplier to provide the customer, unsolicited, with documentation of any change or modification to the product/process, and to apply for a new release. If not otherwise agreed to by the Weatherstrip Global Subsystem Leadership Tea
20、m (GSSLT) or GM Weatherstrip Engineer, 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 department and the supplier. 3.7.1 Test Result
21、s. With reference to this specification, the test results shall be presented in a test report. 3.7.2 Deviations from this Standard. Any deviations from the requirements of this standard shall have prior approval from the Weatherstrip GSSLT. Such requirements shall be specified on component drawings,
22、 test certificates, reports, etc. 3.8 Dimensions and Tolerances. Dimensions and tolerances shall be specified on the engineering part drawing. If no tolerances are specified on the drawing, the tolerances and datums specified in Appendix F7 of the SOR shall apply. Copyright General Motors Company Pr
23、ovided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14147 Copyright 2012 General Motors Company All Rights Reserved May 2012 Page 3 of 10 3.9 Installation Properties. For handl
24、ing and requirements, see relevant part drawing or Master Process Document (MPD). 4 Requirements and Procedure 4.1 Appearance. The surface of both the extruded and molded sections shall have a natural skin. Surfaces shall be smooth and free from voids, bubbles, and hard spots. The parts shall be fre
25、e of mold release, bloom, or any other defects which may be deleterious to the appearance or sealing action. 4.1.1 Appearance Attributes. Appearance attributes, such as color, grain, and gloss, shall be as specified by GM Studio Color and Appearance. 4.1.2 Blemish Requirements. All weatherstrips sha
26、ll meet the engineering drawing or math data file for the Blemish requirements. 4.1.3 Carriers. Metal carriers/reinforcements must be hidden, either by coating or over molding. Molded joint offsets in visible areas and on seal surfaces must be less than or equal to 0.25 mm. 4.2 Performance Requireme
27、nts (Table 1). If a seal consists of several sections/profiles (extrusions and/or molds), the specified tests shall be conducted on each section (each extrusion section and each mold section). Unless otherwise stated, the tests and evaluations shall be performed at the temperature of 23 C 5 C. Table
28、 1: Material and Part Requirements Property Test Procedure Unit Value 4.2.1 Density All Types ISO 2781 Method A or ISO 845 g/cm See value on part drawing 4.2.2 Compression Load Deflection All Types GMW14685-2B2 Compression Load Deflection is determined at 23 C 5 C See curve on part drawing or math d
29、ata file 4.2.3 Long Term Load Loss Set Primary, Decklid, Liftgate, and Hood Seals GMW15564, LLS to be measured at minimum and maximum compression Load Loss Set (LLS) after 360 (+0/-2) h at 80 C 3 C % LLS N/100 mm 1.5 minimum To be reported Secondary and Auxiliary Seals GMW15564, LLS to be measured a
30、t minimum and maximum compression LLS after 360 (+0/-2) h at 80 C 3 C %LLS N/100 mm 0.2 N minimum To be reported 4.2.4 Age Resistance All Types Heat age per ISO 188 Method B, 72 (+0/-2) h at 80 C 3 C, Weatherstrip compressed to nominal compression See curve on part drawing or math data file Copyrigh
31、t 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 GMW14147 Copyright 2012 General Motors Company All Rights Reserved May 2012 Page 4 of 10 Property Te
32、st Procedure Unit Value 4.2.5 Ozone Resistance All Types ISO 1431-1, 100 pphm 10 pphm, 40 C 2 C, 72 (+0/-2) h bent around a mandrel having an outside diameter suitable to impart 20% strain, carrier attached and bulb side outward. The two ends of the weatherstrip shall be tied where they cross one an
33、other with enameled copper or aluminum wire Visual Examination, 2X magnification No cracks 4.2.6 Paint Staining Note 1 All Types ISO 3865, Method A, 24 (+0/-2) h at 80 C 3 C, using production representative painted panels. Basecoat shall be white. To develop latent stain, the panels shall be exposed
34、 to ultraviolet (UV) following the heat exposure. Either: UV exposure 4 h 0.5 h at 13 W/m2 2 W/m2 Or: GMW14162/B/4 MJ/m minimum. For profiles with permanent contact to the body For profiles when contact area is visible No migration stain permissible; Contact stain permissible. No staining permissibl
35、e. 4.2.7 Cold Flexibility All Types Condition per ISO 23529, -40 C 3 C; 22 (-0/+2) h, then bend around mandrel. The sealing section shall be tested while attached to the carrier. It shall be tested with the sealing area on the outside of the assembly when bent over the mandrel, such that the elastom
36、er is under maximum stress when bent 180 degrees around radius of 25 mm 1 mm. Visual Examination No cracks 4.2.8 Volume Resistivity Note 2 All dense elastomeric parts in contact to painted steel in the rocker and wheelhouse area GMW14711 cm 106 minimum All other dense elastomeric parts in contact to
37、 painted steel in the outer body area GMW14711 cm 104 minimum All dense elastomeric parts in contact with painted non-steel metal substrates (i.e., Aluminum, Magnesium) in the rocker, wheelhouse, and primary seal area GMW14711 cm 106 minimum 4.2.9 Bloom All Types (Design Validation (DV) Testing) GMW
38、16317 Method B Visual Examination No adverse changes, no whitening All Types (Product Validation (PV) Testing) GMW16317 Method C1 or C2 Visual Examination No adverse changes, no whitening Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo repro
39、duction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14147 Copyright 2012 General Motors Company All Rights Reserved May 2012 Page 5 of 10 Property Test Procedure Unit Value 4.2.10 Resistance to Adhesion to Glass, Paint, or other Mating Materials Side Cl
40、osure Seals GMW14757, Method A dry and wet (tap water) conditions N 4 maximum no transfer of rubber or coating to the glass, painted panel, or other mating substrate material Front and Rear Closure Seals GMW14757, Method A dry and wet (tap water) conditions N 10 maximum no transfer of rubber or coat
41、ing to the glass, painted panel, or other mating substrate material 4.2.11 Adhesion of Interior Walls All Types GMW14757 Method B No sticking 4.2.12 Heated Backlight Element Compatibility Note 3 For weatherstrips near or in contact with heated backlight element GMW15381 No reaction with the silver f
42、rit will be allowed 4.2.13 Freezing Characteristics of Weatherstrips Side Closure Seals GMW15379 Method A N 15 maximum Front and Rear Closure Seals GMW15379 Method A N 55 maximum 4.2.14 Tear-off Force between Carrier and Seal (Separation of Bulb from the Carrier) All Types Test piece: Section of 50
43、mm 1 mm length. Insert rod through bulb. For profiles with multiple bulbs, the rod shall be inserted into the bulb nearest the carrier. The rod must fill 70% to 90% of the bulb cavity, unless otherwise specified, and must not distort the bulb shape. Clamp carrier securely. Pull rod at a speed of 50
44、mm/minute 5 mm/minute, perpendicular to the carrier. N 150 minimum or bulb tear (cohesive failure) 4.2.15 Squeak and Itch Testing All Types GMW16321 Sones 3.0 maximum 4.2.16 Insertion/Extraction Note 4 All Types GMW14712, Thickness of blade(s) shall be specified on drawing Unless otherwise specified
45、: Insertion Force, open carrier Extraction Force, open carrier Extraction Force, closed carrier (parallel carrier legs) Crimped carrier extraction must meet Subsystem Technical Specification (SSTS) requirements N N N 20 maximum 15 minimum 65 minimum Copyright General Motors Company Provided by IHS u
46、nder license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14147 Copyright 2012 General Motors Company All Rights Reserved May 2012 Page 6 of 10 Property Test Procedure Unit Value 4.2.17 Linear Shri
47、nkage Note 5 All Types Precondition for 6 days minimum at 22 C 3 C and 50% 5% relative humidity (RH). Cut a 300 mm 5 mm length sample from the product. Measure the overall length accurately to the nearest 0.1 mm. Place the test sample in an oven to ISO 188 Method B at 80 C 3 C for 168 (+0/- 2) h. Re
48、move sample and allow it to set for 24 h minimum at room temperature (RT). Measure the length at the same location. Calculate the length dimensional change according to the following formula. Length change (%) = (L1 L0)/L0) x 100% L0 = Length before heat aging L1 = Length after heat aging Length cha
49、nge (unless otherwise specified) Change in appearance % 1 maximum no significant surface changes, particularly changes in color, gloss, or other changes detrimental to serviceability 4.2.18 Tear Strip (Pull Cord) Testing All profiles with Tear Strips GMW15681 Method A 45 degree pull test Method B Ultimate force Method B Elongation at Break N N % 16 maximum 80
