1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 01 2011 08 23 Revised Editorial, updated title and scope to include PA612 G. Kowalski, NA 2006 01 06 Activated G. Gullen Controlled document at www.MATS Copyright 2011, Ford Global Technologies, LLC Page 1 of 4 TUBING, POLYAMIDE 12 or 612
2、 COVER, EVOH BARRIER, POLYAMIDE 12 WSS-M98D33-A12 INNER TUBE, CONDUCTIVE, HIGH PRESSURE LIQUID, LOW PERMEATING FUEL LINE 1. SCOPE This specification describes the requirements for a multilayered liquid fuel carrying line. The construction consists of a heat, hydrocarbon, water, and chloride resistan
3、t outer cover of polyamide 12 (PA12) or 612 (PA612), a middle barrier layer of ethylene vinyl alcohol (EVOH), and an inner tube of conductive polyamide 12 (PA12). The adhesion of the middle EVOH layer to the inner and outer layers is achieved by use of an appropriate tie layer. 2. APPLICATIONS This
4、specification was originally released for liquid carrying supply and return fuel lines utilized in passenger car and light truck applications. This construction is sufficiently flexible to allow for ease of forming, assembly, routing, and is resistant to kinking. Maximum fuel pressure during use sho
5、uld not exceed 0.6 MPa and continuous upper operating temperatures should not exceed 90 C. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 INITIA
6、L QUALIFICATION Suppliers seeking approval to this specification must meet the initial qualification processes that include evaluating materials and constructions according to the applicable Fuel System Design Specification (SDS) and individual Design Verification Methods (DVM). 3.3 FUEL AND VAPOR L
7、INE PERFORMANCE REQUIREMENTS The requirements listed in this specification represent values based on vehicle operating conditions that do not exceed 0.6 MPa fuel pressure. If the fuel system is expected to exceed this pressure this construction is not appropriate for these applications. 3.3.1 Extern
8、al Chemical Resistance (SAE J2027b, fluids defined in SAE J2227 or SAE J2027 unless otherwise listed) Fluid Requirement Aggressive Water No cracking after Brake Fluid (DOT 3) exposure in all fluids Ethylene Glycol and impact testing Fuel C (SAE J1681) IRM 903 Oil (ASTM D 5964) Transmission Oil (Merc
9、on V) ENGINEERING MATERIAL SPECIFICATION WSS-M98D33-A12 Controlled document at www.MATS Copyright 2011, Ford Global Technologies, LLC Page 2 of 4 3.3.2 Ozone Resistance, rating 0 (For both inner and outer layers) Test Method: Test coupon molded per ISO 527; Precondition in Fuel C if anti-ozonants ar
10、e present per SAE J1681 for 1000 hours at 60 C. Apply 1% surface strain by securing onto an appropriate curved template utilizing suitable fasteners. The required curvature can be calculated as follows: r = 49.5d where r = radius and d = thickness ( 0.01mm) Ozone exposure per ASTM D 1149 with the fo
11、llowing modifications: a. minimum 50 pphm and b. minimum 40 C and c. minimum 568 hours Inspect and rate per ASTM D 1149 Acceptance criteria: ASTM Zero (0) rating = No cracks and CARB “resistant to ozone“ 3.3.3 Extractables, g/m2 maximum 2.7 (SAE J2260, Appendix) 3.3.4 Burst Pressure, kPa, minimum (S
12、AE J2260 exposure conditions and burst procedure unless noted) Room temperature burst (As received) 5520 Room temperature burst (After cold impact) 4140 Room temperature burst (After kinking) 4140 High temperature burst (115 C exposure) 1720 Burst after exposure to zinc chloride (Burst after cold im
13、pact) 4140 Burst after exposure to calcium chloride (Follow % concentration and conditions for zinc chloride, burst after cold impact) 4140 Burst after heat aging, 1000 hours 90 C in air (Burst after cold impact) 4140 Burst after air heat aging 1000 hours 90 C +48h 115 C (Burst after cold impact) 41
14、40 Burst after 1000 hours, 50mMol/L sour gas 40 C (Fluid mix per SAE J2260 or ISO 4639-3, burst after cold impact) 4140 Burst After 5000 hours CM15A 60 C (Fluid exposure per SAE J1737, recirculation, burst after cold impact) 4140 ENGINEERING MATERIAL SPECIFICATION WSS-M98D33-A12 Controlled document
15、at www.MATS Copyright 2011, Ford Global Technologies, LLC Page 3 of 4 3.3.5 Cold Impact -40 C (SAE J2260 exposure and test conditions unless otherwise noted) As received No cracks After exposure to zinc chloride No cracks After exposure to calcium chloride (Follow % concentrations and conditions for
16、 zinc chloride) No cracks After heat aging in air, 1000 hours 90 C No cracks After heat aging 1000 hours in air 90 C +48h 115 C No cracks After 1000 hours. 50mMol/L sour gas 40 C (Fluid mix per SAE J2260 or ISO 4639-3) No cracks After 5000 hours CM15A 60 C (Fluid exposure per SAE J1737, recirculatio
17、n) No cracks 3.3.6 Adhesion, N/mm, minimum (All constructions) (SAE J2260 exposure and test methods unless otherwise noted, spiral or strip adhesion test method) As received (SAE J2260) 1.0 After 1000 hours, 50mMol/L sour gas 40 C (SAE J2260 or mixing per ISO 4639-3) 1.0 After 1000 hours in air 90 C
18、 (SAE J2260) 1.0 After 5000 hours CM15A 60 C (Fluid exposure per SAE J2260, recirculation) 1.0 3.3.7 Fuel Permeability Resistance, g/m2/day, maximum As specified in (SAE J 1737, recirculation) applicable engineering Diameters of 12mm or less may be used as specification drawing surrogate samples for
19、 qualification of larger per system diameter constructions requirements Values below are based upon barrier thickness layer of 0.15 +/- 0.03 mm Fuel C Fuel CE10 40 C isothermal 1 1 60 C isothermal 2 3 3.3.8 Kink Resistance Ball must pass freely (SAE J2260) 3.3.9 Dimensional Stability, % length chang
20、e, maximum 4 Longitudinal change from original Test Method: Expose 300 mm of tubing in an air circulating oven (ASTM D 573/ISO 188) for 168 h at 120 +/- 2 C. ENGINEERING MATERIAL SPECIFICATION WSS-M98D33-A12 Controlled document at www.MATS Copyright 2011, Ford Global Technologies, LLC Page 4 of 4 3.
21、3.10 Electrical Resistance, Ohms/square (SAE J2260) 3.3.10.1 Tubing as received Surface resistively less than or equal to 10 e6 3.3.10.2 After exposure to fuel C for 1000 hours, 60 C, kinked and cold impacted Surface resistively less than or equal to 10e6 3.3.11 Flammability Resistance, Cover Stock
22、Only Self-extinguishing (ISO 3795) within 60 seconds 3.3.12 Oxidized Fuel Resistance Sour Fuel, Inner Tube Only (FLTM BZ 105-03, PN 180, 360 hours, 60 C) Tensile change, % maximum -35% Elongation change at break, % maximum -30% Flexural modulus change, % maximum -45% Impact change, % maximum -22% 4.
23、 CYCLIC IMPULSE TESTING Requirements No fluid leak during test No cracking of tube Meet pressure proof test per SAE J2045 Method: Precondition hoses filled with appropriate fluid CE10 is typical for 1000 hours 60 C, drain and dry 1 hour RT. Fill with SAE J1681 test fluid C CM15 is an appropriate sub
24、stitute. Apply cyclic hydraulic pressure from 0-500 kPa fuel. Mechanically vibrate one end at 7 Hz amplitude of 6mm with pressure transition time between 0 and the high pressure of less than 1 second and a 5.0 second duration. Temperature cycle of +66 C, hold 1 hour, cool to -40 C hold one hour. Perform 45,000 pressure cycles. Pressure proof per SAE J2045 within 24 hours of completion.
