1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Release No. Released1994 11 30 Revised and Retyped, was 9 pages1984 05 17 B/701890TP All sheets revised, sheet 9 added1980 04 02 SM/EQ8628TP ReleasedWP 3948-a Page 1 of 4 ADHESIVE TAPE, POLYURETHANE, CLEAR, PAINTABLE, SK-M3G95
2、23-AHEAT RESISTANT1. SCOPEThe mate rial defined by this specification is a heat resistant colorlessclear poly urethane tape single coated by a self adhesive and covered byrelease paper.2. APPLICATIONThis mater ial was originally released to cover joint of window frame todoor in ner panel. The materi
3、al is applied on EC-coated or spray primedsurfaces.3. REQUIREMENTSNot e: The material shall be conditioned for a minimum of 24 h at 23 +/-2 C and 50 +/- 5 % relative humidity prior to test.3.1 DIMENSIONS3.1.1 Width See clause 5.3(Sliding gauge)3.1.2 Thickness 0.18 - 0.23 mm or as specified on(ASTM D
4、 1000) Engineering drawing3.2 COLOR Colorless-clear or as s pecified onEngineering drawing3.3 MASS per m2 0.21 - 0.25 kg3.4 TENSILE STRENGTH, min 160 N/25 mm(ASTM D 882, Method A, separation rate300 mm/minute)3.4.1 Elongation at Break, min 350 %ENGINEERING MATERIAL SPECIFICATIONSK-M3G9523-AWP 3948-b
5、 Page 2 of 4 3.5 180 DEGREE PEEL ADHESION(ASTM D 1000, on polished stainless steel)3.5.1 Original, min 17 N/25 mm(24 h at room temperature)3.5.2 After Ageing No loss of adhesion(14 d at 70 +/- 2 C, 1 h at roomtemperature)3.5.3 After Humidity Ageing No loss of adhesion(72 h at 38 +/- 2 C and 98 +/- 2
6、 %relative humidity)3.6 SHEAR ADHESION, min 40 N/2.5 cm2Test Method: 2.5 cm2 of a 25 mm wide tape shall be bonded to apolished stainless steell panel. The mating sur faces must be pressedfirmly together to force out trapped air and ensure a good bond.Determine shear strength at a rate of 25 mm/minut
7、e.Distance between clamps maximum 5 mm.3.7 SOFTENING POINT, min 95 C(ASTM D 816, except specimens per clause 3.6)Tes t Method: Maintain oven temperature at 50 C for 15 minutes andthen increase 2.5 C/5 minute until bond failure.3.8 PAINTABILITYThe surface shall be dr y to touch after cooling to room
8、temperature.It sh all be free from cracks or bubbles and shall show a uniformclosed paint film without staining or discoloration.Test Method:1) Prepare test panels of 300 x 100 mm according to FLTM EU-BI 20-1A and C.2) Bond 250 x 25 mm pieces of tape on the test panels. The matingsurfaces must be pr
9、essed firmly together to force out trapped airand ensure a good bond.3) 10 mi nutes after bonding, coat test assemblies with productionepox y spray primer at a dry film thickness of 0.025 - 0.035 mm.4) After 10 minutes at room temperature cure specimens separatelyaccording to FLTM EU-BV 50-5, Table
10、2:a) Minimum Curing Cycle, Phase 1b) Maximum Curing Cycle, Phase 1ENGINEERING MATERIAL SPECIFICATIONSK-M3G9523-AWP 3948-b Page 3 of 4 5) After another 10 minutes at room temperature spray separatespecimens with light colored standard and metallic top coatenamel (production material) at a coating thi
11、ckness (dry) of0.04 - 0.05 mm.6) After 10 minutes a room temperature cure specimens separatelyaccording to FLTM EU-BV 50-5, Table 2:a) Minimum Curing Cycle, Phase 2b) Maximum Curing Cycle, Phase 27) Conditi on for 2 hours at room temperature and expose inmechanical convection oven ma intained at 70
12、+/- 2 C for 14 days.8) Test and examine after 24 h at room temperature.3.9 SUBSTANCE CONTROL Legal, health, safety a nd environmental constraints may apply to themate rials which are submitted for approval to this specification.Refer to Engineering Material Specification SK-M99P9999-A.3.10 SUPPLIERS
13、 RESPONSIBILITYAll materials supplied to this specification must be equivalent inal l characteristics to the material upon which approval wasoriginally granted.Pri or to making any change in the properties, composition,constr uction, color, processing or labeling of the materialorig inally approved
14、under this specification, whether or not suchchange s affect the materials ability to meet the specificationrequir ements, the Supplier shall notify Purchasing, Toxicology andthe affected Materials Engineering activity of the proposed changesand obtain the written approval of the Materials Engineeri
15、ngactivity. Test data, t est samples and a new code identification areto be submitted with the request.Substance restrictions imposed by law, regulations or Ford, apply tothe materials addressed by this document. The restrictions aredefined in Engineering Materials Specification WSS-M99P9999-A1.ENGI
16、NEERING MATERIAL SPECIFICATIONSK-M3G9523-AWP 3948-b Page 4 of 4 4. APPROVAL OF MATERIALSMat erials defined by this specification must have prior approval by theresp onsible Materials Engineering activity. Suppliers desiring approvalof thei r materials shall first obtain an expression of interest fro
17、m theaffec ted Purchasing, Design and Materials Engineering activity. Uponrequest, the Supplier shall submit to the affected Materials Engineeringactivity a completed copy of their laboratory test reports, signed by aqualified and authorized representative of the test faci lity, demonstratingful l c
18、ompliance with all the requirements of this specification (testresults, not nominal values), the material designation a nd code number, andtes t specimens for Ford evaluation. Fords engineering approval of amateri al will be based on its performance to this specification and on anassessment of suita
19、bility for intended processes and/or applications. Uponapprov al, the material will be added to the Engineering Material ApprovedSource List.5. GENERAL INFORMATIONThe information given below is provided for clarification and assistancein meeting the requirements of this specification.5.1 STORAGE STA
20、BILITY(From date of receipt at Ford Motor Company)Minimu m 12 months when stored at temperatures below 30 C. Thereleas e liner shall remove easily when measured by hand peelexamination and shall n ot change appreciably after 12 months storagebelow 30 C.(To be certified by supplier on “Initial Sample
21、 Report)5.2 APPLICATION CRITERIA. Only apply tape to absolutely clean and dry surface. The adhesi ve side of the tape shall not be touched or handled,once the release liner has been removed.5.3 WIDTH OF TAPE - Second SuffixThe width of tape shall be identified by an additional suffix to thespecification number as follows:Suffix for widthA 12 mmB 15 mmC 20 mmD 10 mm
