1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 03 2016 01 20 N Status No replacement named G. Kowalski, NA 2006 10 31 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.6, 3.7 & 4 1999 04 05 Activated C. Thomas Copyright 2016, Ford Global Technologies, LLC Page 1 of 4 TUBING, ALLOYED POLY
2、AMIDE COVER, FEP INNER WSS-M98D33-A8 TUBE, CONDUCTIVE, LOW PERMEATING FUEL LINE NOT TO BE USED FOR NEW DESIGN 1. SCOPE These specifications define multilayered fuel and vapor lines comprised of a heat, hydrocarbon, water, and chloride resistant outer cover of polyamide or alloyed polyamide or equiva
3、lent material. The cover is well adhered to a low fuel permeability and fuel/alcohol blend resistant inner tube such as conductive or non-conductive fluorinated ethylene propylene (FEP) or equivalent material. This construction is sufficiently flexible for ease of forming, assembly, and routing, and
4、 is resistant to kinking. 2. APPLICATIONS These specifications were released originally for electrically conductive supply and return liquid carrying fuel lines (WSS-M96D33-A8) where low permeation is required in light truck and passenger car applications. The maximum working pressure is 1000 kPa at
5、 23 C. This tubing is designed to be used through a temperature range of -40 to +125 C with sustained operation at 125 C for 1000 hours and intermittent temperature excursions up to 150 C for 50 hours. This fuel line will meet the requirements for both reformulated and flexible fuels. Liquid fuel ca
6、rrying applications must use the A8. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.4 INITIAL QUALIFICATION Prior to seeking approval to this spec
7、ification, initial qualification processes include evaluating materials and constructions according to the applicable Fuel System Design Specification (SDS) and individual Design Verification Methods (DVM). At the time of this specification development, these SDS/DVM documents were under development
8、 and were not available for distribution. In the absence of specific material requirements listed within SDS/DVM documents, within the Engineering Drawing, or within this specification, the following additional evaluations are to be performed and the data kept on file at the supplier and Materials E
9、ngineering: 3.4.1 Evaluate cover materials according to SAE J 2027 a or b (depending on material). Specific temperatures, tests, and fluids to be agreed upon between the supplier and Ford Motor company and will depend on the anticipated environment in which the material will perform (i.e., engine co
10、mpartment, body and chassis only, etc.). ENGINEERING MATERIAL SPECIFICATION WSS-M98D33-A8 Copyright 2016, Ford Global Technologies, LLC Page 2 of 4 3.4.2 Establish the material long term heat aged property characteristics per SAE J 2236. Data to be reviewed by the appropriate materials engineering o
11、ffice of Ford Motor Company and will depend on the anticipated environment in which the materials will perform. 3.4.3 Perform inner tube fuel compatibility materials evaluations as listed in FLTM AZ-105-02 aged and evaluated according to FLTM BZ 105-03 for flexible fuel applications. 3.5 FUEL AND VA
12、POR LINE PERFORMANCE REQUIREMENTS This specification is a performance-oriented document that may be used as a materials and construction selection guideline, depending upon particular system performance requirements. The minimum requirements listed in this specification represent values based upon h
13、istorical data from similar products and/or minimum system requirements. Actual values listed under each individual construction are to meet or exceed those minimum requirements using data from at least 6 sample lots from actual production articles. Plus or minus 3-sigma data except where noted will
14、 be required prior to approval of the product to this specification. A8 3.5.1 Peel Strength, min 0.05 kg/mm 1.0 (ASTM D 903, Peel Strength of Adhesive Bond between barrier and adjacent layers) Specimens shall be longitudinally cut approximately 3 mm in width and 300 mm in length from tube by means o
15、f suitable clamping jig and sliding cutting fixture holding parallel scalpel blades. Mechanically initiate separation of the layers in the resultant strip by using a scalpel or other suitable hand-held instrument. Install separated layers in opposing grips of a tensile machine and pull at a cross-he
16、ad speed of 50 mm/minute. Alternate Method: Initiate separation of the two layers of the helical specimen obtained per SAE J2260 adhesion test. Affix in a tensile machine as described above. Calculation: Determine the actual Peel Strength per millimeter width. Peel Strength (kN/m) = Load (kN) / spec
17、imen width (m) (Measured to the nearest +/- 0.01 mm using optical comparator or equivalent instrument.) Report lowest value. 3.5.2 Room Temperature Burst, min 4.5 MPa (SAE J2260, Section 7.1) 3.5.3 High Temperature Burst, min 1.5 MPa (SAE J2260, Section 7.2 except temperature 90 C) 3.5.4 Resistance
18、to Zinc Chloride No cracks or (SAE J2260, Section 7.5. The zinc fractures chloride must be in contact with the ends of the tubing but should not be able to enter inside the connectors) ENGINEERING MATERIAL SPECIFICATION WSS-M98D33-A8 Copyright 2016, Ford Global Technologies, LLC Page 3 of 4 3.5.5 Re
19、sistance to Kinking Ball must pass (SAE J 2260, Section 7.3) freely 3.5.6 Burst Test Kinked Tubing, min 4.0 MPa (SAE J2260, Section 7.4) 3.5.7 Cold Impact Resistance at - 40 C (SAE J 2260 Section 7.6) Minimum burst after impact 3.5 MPa 3.5.8 Dimensional Stability Longitudinal shrinkage of original 3
20、% length (max) 0.5 Test Method: Expose 300 mm of tubing in an air circulating oven (ASTM D573/ISO 188) for 168 h at 120 +/- 2 C. 3.5.9 Resistance to 65% Fuel C + Fuel exposure 20% Methanol +15% MTBE time I.D. of 40 +/- 2 C for 1000 h tubing at Burst Test, min 5.0 MPa Check for Delamination No delami
21、nation (SAE J 2260) 3.5.10 Resistance to 85% Fuel C + Fuel exposure 15% Methanol time I.D. of tubing at 40 +/- 2 C for 1000 h Burst Test, min 5.5 MPa Check for Delamination No Delamination (SAE J 2260) 3.5.11 Resistance to Oxidized Fuel (Sour Gas) (SAE J 2260, 336 h at 60 +/- 2 C, except prepare fue
22、l according to FLTM AZ 105-01, PN 180) Burst Test, min 5.5 MPa Check for Delamination No delamination (SAE J 2260) ENGINEERING MATERIAL SPECIFICATION WSS-M98D33-A8 Copyright 2016, Ford Global Technologies, LLC Page 4 of 4 3.5.12 Permeation Resistance, g/m2/24 hr 10 (SAE J 2260, Section 7.10 using As
23、 specified in 75% Fuel C, 25% methanol, Engineering Drawing 60 C, 200 kPa) 3.5.13 Electrical Resistance, Ohm/square Surface resistivity (SAE J 2260, Section 7.9) less than or equal to 106 5.5 X 105 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of these specifications. 5.1. RECYCLING CODE A8
