GMW-14147-2008.pdf

WORLDWIDE ENGINEERING STANDARDS General Specification Elastomers GMW14147 Requirements for Expanded Elastomeric Body Seals © Copyright 2008 General Motors Corporation All Rights Reserved April 2008 Originating Department: North American Engineering Standards Page 1 of 9 1 Introduction Note: Nothing in this standard supersedes 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 openings. 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). For attachment purposes, weatherstrips require a dense base (carrier). This 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. Weatherstrip 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 no greater than 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: sealing 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 3865 ISO 105-B06 ISO 7500-1 ISO 105-G02 ISO 9513 ISO 188 ISO 23529 ISO 1431-1 2.2 GM Standards/Specifications. GM9842P GMW14685 GM9843P GMW14711 GMW3001 GMW14712 GMW3059 GMW14757 GMW14125 GMW15379 GMW14162 GMW15381 GMW14170 GMW15382 GMW14294 GMW15564 GMW14650 GMW15681 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 Alternatives. Alternative test facilities and equipment may also be used. However, all measuring variables as specified in this specification shall be determined correctly with respect to its physical definition. 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 machine 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 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 GMW14147 GM WORLDWIDE ENGINEERING STANDARDS © Copyright 2008 General Motors Corporation All Rights Reserved Page 2 of 9 April 2008 three finished parts, for Routine Quality Control from at least one finished part. The number of test pieces required is defined in Appendix B, Table B1 3.2 Preparation. Not applicable. 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 ± 5°C for at least 8 h prior to test and shall be free from strain during this period. 3.4 Instructions. Not applicable. 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 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 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 requires 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, 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 Results. With reference to this specification the test results shall be presented in a test report. 3.7.2 Deviations from this Standard. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 3.8 Dimensions and Tolerances. Dimensions and tolerances shall be specified on the engineering part drawing or in the math data file. 3.9 Installation Properties. Handling and requirements see relevant part drawing or Product Assembly Document (PAD). 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 free 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 shall be as specified by GM Styling. 4.1.2 Blemish Requirements. All weatherstrips shall 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 overmolding. Molded joint offsets in visible areas and on seal surfaces must be no greater than 0.25 mm. 4.2 Performance Requirements. If a seal consists of several sections the specified tests shall be conducted on each section. Unless otherwise stated, the tests and evaluations shall be performed at the temperature of 23 ± 5°C, see Appendix A. 5 Provisions for Shipping 5.1 Approved Sources. Engineering qualifications of an approved source is required for this specification. Only sources listed in the GM Materials File (e.g., MATSPC) under this specification number have been qualified by engineering as meeting the requirements of this specification. For other GM locations, the responsible engineering group should be contacted to obtain the approved source in that individual country. 5.2 Other Additional Requirements. 5.2.1 All submissions for approval shall include test reports detailing performance to this standard, as well as a Thermogravimetric Analysis (TGA) curve and Fourier Transform Infra-red Spectroscopy (FT- IR) Spectrum for each material used. The FT-IR spectra and thermograms submitted for initial approval shall be considered the reference standard. All samples shall produce FT-IR spectra and thermograms that correspond to the reference standards when tested under the same conditions. 5.2.2 See relevant component drawings for additional requirements. -,-,- GM WORLDWIDE ENGINEERING STANDARDS GMW14147 © Copyright 2008 General Motors Corporation All Rights Reserved April 2008 Page 3 of 9 6 Notes 6.1 Glossary. Not applicable. 6.2 Acronyms, Abbreviations, and Symbols. EPDM ethylene propylene diene monomer FT-IR Fourier Transform Infra-red Spectroscopy PAD Product Assembly Document PPAP Production Part Approval Process TGA Thermogravimetric Analysis UV Ultra Violet 7 Additional Paragraphs 7.1 All parts or systems supplied to this standard must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 7.2 All materials supplied to this standard must comply with the requirements of GMW3001, Rules and Regulations for Materials Specifications. 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW14147 9 Release and Revisions 9.1 Release. This standard originated in May 2005. It was first approved by the Global Elastomers Team in August 2005. It was first published in August 2005. It supersedes all regional material specifications for Expanded Elastomeric Body Seals for use on Global Engineered materials including but not limited to GME 01004, STD 3307, EDS-M-7304, and GMN11018. 9.2 Revisions. Rev Approval Date Description (Organization) A MAR 2008 Complete revision, replacing local test methods with respective GMW specifications (Global Elastomers Team) -,-,- GMW14147 GM WORLDWIDE ENGINEERING STANDARDS © Copyright 2008 General Motors Corporation All Rights Reserved Page 4 of 9 April 2008 Appendix A Table A1: Material and Part Requirements Property Test Procedure Unit Value Compression Load Deflection All Types GMW14685-2B2 Compression Load Deflection is determined at both 23 5°C and at 30 2°C. see part drawing or math data file Long Term Load Loss Set All Types GMW15564 Change in LLS after 360 (-2) h at 80 ± 3°C Load Loss Set after 360 -2 h at 80 ± 3°C % N/100 mm 43 maximum 2.1 minimum Age Resistance All Types ISO 188 Method B, 72 0/-2 h at 70 ± 3°C Weatherstrip compressed to nominal value Compression Load Deflection at 23 5C see part drawing or math data file Ozone Resistance All Types ISO 1431-1, 100 ± 10 pphm, 40 ± 2°C, 72 (-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 another with enameled copper or aluminum wire Visual Examination, 2X magnification No cracks Paint Staining All Types ISO 3865, Method A using production representative painted panels. Basecoat shall be white. To develop latent stain, the panels shall be exposed to UV following the heat exposure. Either: UV exposure 4 ± .5 h at 13 ± 2 W/m2 Or: GMW14162/B/4 MJ/m² 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 permissible. Cold Flexibility All Types ISO 23529, -40 ± 3°C; 22 (+2) h, 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 elastomer is under maximum stress bent 180 degrees around radius of 25 ± 1 mm, Visual Examination. No cracks GM WORLDWIDE ENGINEERING STANDARDS GMW14147 © Copyright 2008 General Motors Corporation All Rights Reserved April 2008 Page 5 of 9 Property Test Procedure Unit Value Volume Resistivity All dense elastomeric parts in contact to painted sheet metal in the outer body area. GMW14711 cm 106 minimum Resistance to Adhesion to Glass, Paint, or other Mating Materials All Types 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 Adhesion of Interior Walls All Types GMW14757 Method B No sticking Heated Backlight Element Compatibility Note 1 For weatherstrips near or in contact with heated backlight element GMW15381 No reaction with the silver frit will be allowed Freezing Characteristics of Weatherstrips All Types GMW15379 Method A N 15 maximum Tear-off Force between Carrier and Seal (Separation of Bulb from the Carrier) All Types Test piece: Section of 50 ± 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 ± 5 mm/minute, perpendicular to the carrier. N 150 N minimum or bulb tear (cohesive failure) Squeak and Itch Testing All Types GM9842P Sones 3.0 maximum Insertion/Extraction Note 2 All Types GMW14712 Unless otherwise specified: Insertion Force open carrier, blade - 5 mm: Extraction Force open carrier, blade - 2 mm Extraction Force closed carrier, blade - 2 mm N N N 20 maximum 15 minimum 65 minimum GMW14147 GM WORLDWIDE ENGINEERING STANDARDS © Copyright 2008 General Motors Corporation All Rights Reserved Page 6 of 9 April 2008 Property Test Procedure Unit Value Linear Shrinkage Note 3 All Types Precondition for 6 days minimum at 22 3°C and 50 5% RH. Cut a 300 ± 5 mm length sample from the product. Measure the overall length accurately with vernier calipers. Place the test sample in an oven to ISO 188 Method B at 80 3°C for 168 - 2 h. Remove sample and allow it to set for 24 h minimum at 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 change (unless otherwise specified) Change in appearance % ±1 maximum no significant surface changes, particularly changes in color, gloss, or other changes detrimental to serviceability Vibration Wear Testing For decklid and liftgate weatherstrips or if specified on drawing / math data file GM9843P cycles 100 000 minimum with no material transfer, weatherstrip damage or paint damage 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 % 13 ± 0.3 80 minimum to be reported Resistance to Protective Wax Remover All profiles used in outer body area GMW14294 The elastomer profile shall show no waviness. -,-,- GM WORLDWIDE ENGINEERING STANDARDS GMW14147 © Copyright 2008 General Motors Corporation All Rights Reserved April 2008 Page 7 of 9 Property Test Procedure Unit Value Weather-Ometer Note 4 All parts with direct or indirect exposure to sunlight. GMW14650, Weather-Ometer (Xenon Arc) Resistance Class 3 Change of surface Color change E Visual color change that is considered unacceptable shall override the E measurement. Examination of surface under 50X magnification No tackiness or