1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2008 03 19 Revised Inserted 2.1 K. Kuenzel 2006 09 12 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.6 & 4 1993 02 11 Released NGA1E10269419001 L. Gullen Printed copies are uncontrolled Copyright 2008, Ford Global Technologies, LLC Page 1 of 3
2、 HOSE, POLYTETRAFLUOROETHYLENE (PTFE), CONTINUOUS WSL-M96D37-A FILAMENT GLASS BRAID REINFORCED, FUEL RESISTANT 1. SCOPE This specification defines a hose material fabricated from seamless polytetrafluoroethylene (PTFE) tube having good fuel and permeation resistance. The cover is externally reinforc
3、ed with a continuous filament glass fiber braid which may contain up to 10% aramid fiber as an additive for wear resistance. The hose will withstand temperatures up to 250 C and down to -40 C. 2. APPLICATION This specification was released originally for flexible fuel lines used for light truck appl
4、ications. 2.1 LIMITATIONS With electrostatic dissipative PTFE tubing, caution must be taken to remove large carbon agglomerates prior to billeting. The mix sequence for the incorporation of carbon black and the carbon black raw material must be evaluated for agglomerate formation and material should
5、 be sifted prior to forming the extrusion billets. These measures are to prevent the formation of potential leak paths and ensure homogenous heating during the sintering operation when using an infrared heat source. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material supplier
6、s and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.4 HOSE CONSTRUCTION The hose material shall consist of a tube of high grade PTFE as defined by WSL-M4D632-A with a cover of braided continuous filament E type glass + aramid fiber cov
7、ering 90% minimum of the tubes outer surface. The glass braid shall be completely covered with a PTFE emulsion giving the hose a smooth abrasion resistant cover. The following tests where possible, shall be performed on finished hoses and/or test specimens cut from them in accordance with ASTM D 318
8、3 (cutting knife procedure preferred). Greater variation in test values can be anticipated when evaluating materials that are thinner then recommended by an applicable Industry Standard/Test Method. 3.5 PHYSICAL PROPERTIES 3.5.1 Adhesion, min 262 N/m (ASTM D 413, Strip Method, Type A, 25 mm/minute t
9、est speed, tube to cover) ENGINEERING MATERIAL SPECIFICATIONWSL-M96D37-APrinted copies are uncontrolled Copyright 2008, Ford Global Technologies, LLC Page 2 of 3 3.5.2 Melting Point, min 320 C (ISO 1218, Method B/ASTM D 789, cover only) 3.5.3 Burst Pressure, min 3.5 MPa (ASTM D380) 3.5.4 Cold Impact
10、 at -40 C, min 2.8 MPa (SAE J844, except precondition tubing for 72 h in Fuel B at 30 C) 3.5.5 Fuel Permeability Resistance 10 g/m2/24 h (SAE J30, except 85% Fuel C +15% Methanol for 21 d) 3.5.6 Flammability (ISO 3795) Burn Rate, max 100 mm/minute Hose must be self-extinguishing within 60 s. 3.5.7 M
11、easured Current, min 6 microA (FLTM BP 108-08) 3.5.8 Resistance to Kinking Test Method: Insert required length of hose on test fixture securing each end with metal clamps. When installing hose, it shall be bent within 5 s in the same plane and direction as its free state curvature. Place fixture in
12、an oven at 120 +/- 2 C for 1 h. Remove fixture from oven and within 5 minutes pass a steel ball of specified diameter through hose installed on fixture. Ball must pass freely. ENGINEERING MATERIAL SPECIFICATIONWSL-M96D37-APrinted copies are uncontrolled Copyright 2008, Ford Global Technologies, LLC
13、Page 3 of 3 Nominal I.D. I.D. Limits Test Sample Ball Diameter mm mm Length, mm, min mm 6 4.88 - 6.76 250 2.40 +/- 0.05 8 6.91 - 8.33 300 3.20 +/- 0.05 9 8.51 - 9.91 400 3.95 +/- 0.05 Sample Selection: Production hose selected for the kink test should represent, as nearly as possible, min wall thick
14、ness. When recording results include wall thickness, ovality, and dimension A (see above). This dimension is measured while sample is on the test fixture. 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 RECYCLING CODE PTFE
