1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions 2006 10 31 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.6, 3.7 & 4 2000 07 31 Editorial No Technical Change APC 1999 04 05 Activated C. Thomas Printed copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 1 of 4 TUBING,
2、 ALLOYED POLYAMIDE COVER, FEP INNER WSS-M98D33-A7 TUBE, NON-CONDUCTIVE, LOW PERMEATING FUEL VAPOR LINE TUBING, ALLOYED POLYAMIDE COVER, FEP INNER WSS-M98D33-A8 TUBE, CONDUCTIVE, LOW PERMEATING FUEL LINE 1. SCOPE These specifications define multilayered fuel and vapor lines comprised of a heat, hydro
3、carbon, water, and chloride resistant outer cover of polyamide or alloyed polyamide or equivalent 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 materia
4、l. This construction is sufficiently flexible for ease of forming, assembly, and routing, and is resistant to kinking. 2. APPLICATIONS These specifications were released originally for electrically non-conductive fuel vapor (WSS-M96D33-A7) and electrically conductive supply and return liquid carryin
5、g 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 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 intermit
6、tent temperature excursions up to 150 C for 50 hours. This fuel line will meet the requirements for both reformulated and flexible fuels. Note: The construction and performance properties of the WSS-M96D33-A7 and A8 are essentially the same except for inner tube electrical conductivity in the A8. Li
7、quid fuel carrying 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
8、to this specification, 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
9、 development 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
10、 Materials Engineering: 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
11、., engine compartment, body and chassis only, etc.). ENGINEERING MATERIAL SPECIFICATION WSS-M98D33-A7/A8 Printed copies are uncontrolled Copyright 2006, 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 revi
12、ewed by the appropriate materials engineering office 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
13、for flexible fuel applications. 3.5 FUEL AND VAPOR 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 t
14、his specification represent values based upon historical 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. Plu
15、s or minus 3-sigma data except where noted will be required prior to approval of the product to this specification. A7 and 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
16、 mm in width and 300 mm in length from tube by means of 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 oppo
17、sing grips of a tensile machine and pull at a cross-head 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 mil
18、limeter width. Peel Strength (kN/m) = Load (kN) / specimen 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 3.5 MPa 4.5 (SAE J2260, Section 7.1) A7 and A8 3.5.3 High Temperature Burst, min 1.0 MP
19、a 1.5 (SAE J2260, Section 7.2 except temperature 90 C) 3.5.4 Resistance 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-M98D
20、33-A7/A8 Printed copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 3 of 4 3.5.5 Resistance to Kinking Ball must pass (SAE J 2260, Section 7.3) freely 3.5.6 Burst Test Kinked Tubing, min 2.6 MPa 4.0 (SAE J2260, Section 7.4) 3.5.7 Cold Impact Resistance at - 40 C (SAE J 2260 S
21、ection 7.6) Minimum burst after impact 2.6 MPa 3.5 3.5.8 Dimensional Stability Longitudinal shrinkage of original 3% 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% Metha
22、nol +15% MTBE time I.D. of 40 +/- 2 C for 1000 h tubing at Burst Test, min 2.6 MPa 5.0 Check for Delamination No delamination (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 2.6 MPa 5.5 Check for Delamination No D
23、elamination (SAE J 2260) A7 and A8 3.5.11 Resistance to Oxidized Fuel (Sour Gas) (SAE J 2260, 336 h at 60 +/- 2 C, except prepare fuel according to FLTM AZ 105-01, PN 180) Burst Test, min 2.6 MPa 5.5 Check for Delamination No delamination (SAE J 2260) ENGINEERING MATERIAL SPECIFICATION WSS-M98D33-A7
24、/A8 Printed copies are uncontrolled Copyright 2006, 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 specified in 75% Fuel C, 25% methanol, Engineering Drawing 60 C, 200 kPa) A8 Only 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 A7 A8
