1、 WORLDWIDE ENGINEERING STANDARDS General Specification GMW14168 Elastomeric Seals for Glass Sealing - Flocked or Coated Copyright 2012 General Motors Company All Rights Reserved June 2012 Originating Department: North American Engineering Standards Page 1 of 12 1 Introduction Note: Nothing in this s
2、tandard 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 for elastomeric sealing profiles, mainly used in the area with movable glass pane
3、s. These seals can be flocked or coated. 1.2 Mission/Theme. Not applicable. 1.3 Classification. 1.3.1 Material Description. The sealing portion of the weatherstrips shall be made from ethylene propylene diene monomer (EPDM) rubber or thermoplastic elastomer (TPE). The specifications for the carrier
4、shall be specified on the engineering part drawing and 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 joints. Joint offsets in visible and sealed areas mus
5、t be less 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:
6、sealing profiles in areas with movable glass, such as door glass run channels and belt strips. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 37 ISO 868 ISO 4892 ISO 23529 ISO 48 ISO 1431-1 ISO 7500-1 ISO 12
7、1031 ISO 188 ISO 3865 ISO 9513 SAE J2527 2.2 GM Standards/Specifications. 9982223 GMW14294 GMW14712 GMW15692 GMW3059 GMW14650 GMW15381 GMW15693 GMW14125 GMW14685 GMW15382 GMW16317 GMW14162 GMW14698 GMW15564 GMW16774 GMW14170 GMW14711 GMW15683 L 000 0555 2.3 Additional References. KPAC MATBWS-3 KPAC
8、WSTRGEN-6 Weatherstrip Component Technical Specification, CG1019 3 Test Preparation and Evaluation 3.1 Resources. 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
9、ENGINEERING STANDARDS GMW14168 Copyright 2012 General Motors Company All Rights Reserved June 2012 Page 2 of 12 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
10、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 machine shall fulfill the following requirements: the f
11、orce-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/Test Samples. Unless otherwise spe
12、cified, the shape, size and number of test pieces shall be in accordance with the relevant test procedure. 3.1.5.1 The number of test pieces required for material and component approval is defined in the Weatherstrip Component Technical Specification (CG1019). For Design and Product Validation, test
13、 pieces shall be cut from at least three finished parts, and for Routine Quality Control from at least one finished part. Reference Appendix A, Table A1. If straight test pieces cannot be obtained from the finished parts in appropriate length, straight samples from the same manufacturing batch shall
14、 be delivered unsolicited. 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. 3.3 Conditions. 3.3.1 Environmental Conditions. The minimum time between vulcanization and testing of elastomers shall
15、 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 applicable. 3.5 Data. Not applicable. 3.6 Safety. This standard may involve hazardous materials, operations, and equipment
16、. 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 o
17、f 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 Engineering, Materials Engineering, Appearance Engineering, and/or Validation Engineering) prior to the start of delivery
18、 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, w
19、ith 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 Team (GSSLT) or GM Weatherstrip Engineer, the entire verification test shall be repeated and documented by the supplier pr
20、ior 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 standard, the test results shall be presented in a test report. 3.7.2 Deviations from This St
21、andard. Any deviations from the requirements of this standard shall have prior approval from the Weatherstrip GSSLT. 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 enginee
22、ring part drawing. If no tolerances are specified on the drawing, the tolerances and datums specified in Appendix F7 of the Statement of Requirements (SOR) shall apply. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networki
23、ng permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14168 Copyright 2012 General Motors Company All Rights Reserved June 2012 Page 3 of 12 3.9 Installation Properties. For handling and requirements, see relevant part drawing or Master Process Document (MPD). 4 Requirement
24、s and Procedure 4.1 Appearance. Surfaces shall be free from voids, bubbles, tears, waves, pushes, and puckers which may impair the performance or appearance. The parts shall be free of mold release, bloom, or any other defects which may be deleterious to the appearance or sealing function. Coatings
25、and flock shall be non-abrasive and uniform in color and finish over the specified area. 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 shall meet the engineer
26、ing drawing and math data file for the blemish requirements. For additional information on blemish requirements, see KPAC WSTRGEN-6. 4.1.3 Carriers. Metal carriers/reinforcements must be specified on the drawing and in the math data file. Carriers must not be visible (i.e., must be coated or over-mo
27、lded). Molded joint offsets in visible areas and on seal surfaces must be 0.25 mm. 4.2 Performance Requirements, Tables 1 thru 4. 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 se
28、ction). Unless otherwise stated, the tests and evaluations shall be performed at the temperature of 23 C 5 C. 4.2.1 Prior to submission of finished parts, the supplier shall submit the required test data for material approval on sheet stock tested to Table 1 with the required number of samples per t
29、he Weatherstrip Component Technical Specification (CG1019). Samples are to be taken from finished parts for all tests other than material approval and release. Table 1: Material Requirements for Sheet Stock and Finished Components Property Test Procedure Unit Value 4.2.1.1 Hardness EPDM ISO 48 Metho
30、d M IRHD See part drawing TPE ISO 868, 15 s delay Shore A See part drawing 4.2.1.2 Elongation at Break All types ISO 37, Type 2 or 4 dumbbell, 200 mm 20 mm/minute. % 200 minimum 4.2.1.3 Tensile Strength All types ISO 37, Type 2 or 4 dumbbell, 200 mm 20 mm/minute. MPa 6 minimum 4.2.1.4 Age Resistance
31、 (Heat Aging) All types ISO 188 Method B, 168 (+0/- 2) h at 100 C 3 C. Change of hardness Change in tensile strength Change in elongation at break IRHD/Shore A % % +10 maximum 30 maximum -50 maximum 4.2.1.5 Ozone Resistance All types ISO 1431-1, 100 pphm 10 pphm, straight sample 20% strain, 40 C 2 C
32、, 72 (+0/-2) h. Test piece: length 100 mm 1 mm, width 4 mm 1 mm, thickness 1 mm to 2 mm Visual Examination, 2X magnification. No cracks Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from
33、 IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14168 Copyright 2012 General Motors Company All Rights Reserved June 2012 Page 4 of 12 Property Test Procedure Unit Value 4.2.1.6 Paint Staining Note 1 All types ISO 3865, Method A, 24 (+0/-2) h at 80 C 3 C, using production representative painted panel
34、s. Basecoat shall be white. To develop latent stain, the panels shall be exposed 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
35、 No migration stain permissible; contact stain permissible. No staining permissible. 4.2.1.7 Cold Flexibility All types Condition per ISO 23529, -40 C 3 C; 22 (-0/+2) h, then bend around mandrel. Test piece: length 100 mm 1 mm, width 4 mm 1 mm, thickness 1 mm to 2 mm. Bend 180 around radius of 1 mm.
36、 Visual Examination. No cracks. No loss of adhesion of flock. 4.2.1.8 Volume Resistivity Note 2 All dense elastomeric parts in contact to painted steel in the outer body area. GMW14711 cm 104 minimum 4.2.1.9 Bloom All types Design Validation (DV) testing GMW16317 Method B Visual Examination No adver
37、se changes, no whitening. All types Product Validation (PV) testing GMW16317 Method C1 or C2 Visual Examination No adverse changes, no whitening. Note 1: Painted panels must be stored at -30 C 3 C until usage. Note 2: See Weatherstrip Component Technical Spec (CG1019) for resistivity requirements by
38、 part. 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 GMW14168 Copyright 2012 General Motors Company All Rights Reserved June 2012 Page 5 o
39、f 12 Table 2: Component Requirements Property Test Procedure Unit Value 4.2.2 Compression Load Deflection All types GMW14685-2B2 Compression Load Deflection (CLD) is determined at 23 C 2 C. Target CLD for outer belt and outer lips of glass run channel (GRC) at nominal compression. Target CLD for inn
40、er belt and inner lips of GRC at nominal compression. N/100 mm N/100 mm See curve on part drawing or math data file 6.0 2.0 8.0 2.5 4.2.3 Long Term Load Loss Set All types GMW15564 Load Loss Set (LLS) after 360 (+0/-2) h at 80 C 2 C at nominal glass position. N/100 mm 2.1 minimum 4.2.4. Permanent Se
41、t All glass run channels and belt strips Test piece supported and deflected in production representative manner. Test assembly stored for 72 (+0/-2) h at +100 C 3 C, removed from the heat source, constraint removed and allowed to cool for 30 minutes 1 minute. Glass run channels maximum gap. Outer Be
42、lt strips minimum recovery Inner Belt Strips minimum recovery mm mm mm 1.0 less than the test pane thickness (i.e., for 4 mm glass thickness, maximum gap allowable is 3.0 mm). Nominal Deflection + 1.25 mm Nominal Deflection + 2.00 mm 4.2.5 Resistance to Protective Wax Remover All profiles used in ou
43、ter body area GMW14294 The elastomer profile shall show no waviness. 4.2.6 Sliding Resistance All types GMW15683 Conditions of test see, Appendix B, Table B2 Sliding Resistance. N/100 mm 3.5 maximum 4.2.7 Heated Backlight Element Compatibility Note 1 Seals on moveable (dropping) rear windows GMW1538
44、1 No reaction with the silver frit will be allowed. 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 GMW14168 Copyright 2012 General Motors C
45、ompany All Rights Reserved June 2012 Page 6 of 12 Property Test Procedure Unit Value 4.2.8 Linear Shrinkage Note 2 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 n
46、earest 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. Remove 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
47、 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 4.2.9 Weathero
48、meter All parts with direct or indirect exposure to sunlight. GMW14650, Weather-Ometer (Xenon Arc) Resistance. See Weatherstrip Component Technical Specification (CG1019) for required exposures by part. A minimum of five samples shall be placed in the weatherometer such that samples shall be pulled, evaluated (visual inspection and E calculated) and retained at the following intervals: 221.2 kJ/m2, 442.4 kJ/m2, 663.6 kJ/m2, 1240.8 kJ/m2, and 2500 kJ/m2 for SAE J2527 test procedure. Respectively: 265 kJ/m2, 530 kJ/m2; 800 kJ/m2; 1500 kJ/m2 and
