1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions Rev. 12011 06 16 Revised Added PA 612 as option for cover in Title and Scope A. Reaume, FNA 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 CO
2、VER, EVOH BARRIER, POLYAMIDE 12 WSS-M98D33-A11 INNER TUBE, LOW PRESSURE VAPOR, LOW PERMEATING FUEL LINE 1. SCOPE This specification describes the requirements for a multilayered vapor fuel carrying line. The construction consists of a heat, hydrocarbon, water, and chloride resistant outer cover of p
3、olyamide 12 (PA12) or polyamide 6/12 (PA612), a middle barrier layer of ethylene vinyl alcohol (EVOH), and an inner tube of 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 specification was
4、originally released for fuel vapor and vent 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 should not exceed 0.2 MPa and continuous
5、 upper operating temperatures should no 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 INITIAL QUALIFICATION Suppliers seeking appr
6、oval to this specification must meet the initial qualification processes which 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 LINE PERFORMANCE REQUIREMENTS The requ
7、irements listed in this specification represent values based on vehicle operating conditions which do not exceed 0.2 MPa fuel vapor pressure. If the fuel system is expected to exceed this pressure this construction is not appropriate for these applications. 3.3.1 External Chemical Resistance (SAE J2
8、027b, 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 (Mercon V) ENGINEERING MATERIAL SPE
9、CIFICATIONWSS-M98D33-A11 Copyright 2011, Ford Global Technologies, LLC Page 2 of 4 Inspect and rate per ASTM D 1149 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 are present per SAE J1681 for
10、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 following modifications: a.
11、 minimum 50 pphm and b. minimum 40 C and c. minimum 568 hours Acceptance criteria: ASTM Zero (0) rating = No cracks and CARB “resistant to ozone“ 3.3.3 Extractables, g/m2maximum2.7 (SAE J2260, Appendix) 3.3.4 Burst Pressure, kPa, minimum (SAE J2260 exposure conditions and burst procedure unless note
12、d) Room temperature burst (As received) 1200 Room temperature burst (After cold impact) 900 Room temperature burst (After kinking) 900 High temperature burst (115 C exposure) 450 Burst after exposure to zinc chloride (Burst after cold impact) 900 Burst after exposure to calcium chloride (Follow % co
13、ncentration and conditions for zinc chloride, burst after cold impact) 900 Burst after heat aging, 1000 hours 90 C in air (Burst after cold impact) 900 Burst after air heat aging 1000 hours 90 C +48 h 115 C (Burst after cold impact) 900 Burst after 1000 hours, 50mMol/L sour gas 40 C (Fluid mix per S
14、AE J2260 or ISO 4639-3, burst after cold impact) 900 Burst After 5000 hours CM15A 60 C (Fluid exposure per SAE J1737, recirculation, burst after cold impact) 900 ENGINEERING MATERIAL SPECIFICATIONWSS-M98D33-A11 Copyright 2011, Ford Global Technologies, LLC Page 3 of 4 3.3.5 Cold Impact -40 C (SAE J2
15、260 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 zinc chloride) No cracks After heat aging in air, 1000 hours 90 C No cracks After heat aging 1000 ho
16、urs 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, recirculation) No cracks 3.3.6 Adhesion, N/mm, minimum (All constructions) (SAE J2260 exposure and test methods u
17、nless otherwise noted, spiral or strip adhesion test method) As received (SAE J2260) 1.0After 1000 hours, 50mMol/L sour gas 40 C (SAE J2260 or mixing per ISO 4639-3) 1.0After 1000 hours in air 90 C (SAE J2260) 1.0After 5000 hours CM15A 60 C (Fluid exposure per SAE J2260, recirculation) 1.0 3.3.7 Fue
18、l Permeability Resistance, g/m2/day, maximum As specified in (SAE J1737, recirculation) applicable engineering Diameters of 12 mm or less may be used as specification drawing surrogate samples for qualification of larger per system diameter constructions requirements Values below are based upon barr
19、ier 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 change, maximum 4 Longitudinal change from original Test Method: Expose 300 mm of tubing in an air circulatin
20、g oven (ASTM D 573/ISO 188) for 168 hours at 120 +/- 2 C. ENGINEERING MATERIAL SPECIFICATIONWSS-M98D33-A11 Copyright 2011, Ford Global Technologies, LLC Page 4 of 4 3.3.10 Flammability Resistance, Cover Stock Only Self-extinguishing (ISO 3795) within 60 seconds 3.3.11 Oxidized Fuel Resistance Sour F
21、uel, Inner Tube Only (FLTM BZ 105-03, PN 180, 360 hours, 60 C) Tensile change, % maximum -28% Elongation change at break, % maximum -10% Flexural modulus change, % maximum -32% Impact change, % maximum -10% 3.4. CYCLIC IMPULSE TESTING Requirements No fluid leak during test, no cracking of tube, meet
22、 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 substitute. Apply cyclic hydraulic pressure from 0-55 kPa vapor. Mechanically vibrate one
23、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
24、 4. GENERAL INFORMATION This information given below is provided for clarification and assistance in meeting the requirements of this specification. Contact for questions concerning Engineering Material Specifications. 5. SUMMARY OF REVISIONS 2011 06 24 Added PA612 cover material option due to PA12 shortage.
