1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 08 12 N-STATUS No known use. No Replacement Named C. Mracna, NA 2004 09 09 Revised Para 3.0 inserted; para 3.10, 3.11 & 4 deleted 1976 08 25 Released CAF2-761186 Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LL
2、C Page 1 of 3 TUBE, UNREINFORCED RUBBER-FUEL LINE ESA-M2D50-B NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is an unreinforced rubber tube. 2. APPLICATION This specification was released originally for a material used for evaporative fuel lines. 3. REQUIREMENTS Ru
3、n all tests on molded parts. 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). 3.1 CONSTRUCTION The tubing shall have a smooth bore made from synthetic rubber with sui
4、table gasoline, oil and ozone resistance. Either a single wall tubing or co-extruded tube and cover construction may be used. 3.2 VACUUM COLLAPSE Outside diameter shall be no less than 80% of original. Test Method: Subject tubing to a vacuum of 24 in Hg (81 kPa) while bent over a mandrel having a di
5、ameter 10 times the nominal O.D. Hold for 1 h at 102 +/- 3 C. 3.3 COLD FLEXIBILITY No cracks (ASTM D 746, 5 h at -40 C) 3.4 OZONE RATING 0 (FLTM BP 101-01) 3.5 HIGH TEMPERATURE RESISTANCE No cracks Test Method: Age a section of tubing, bent in a free loop until ends meet, in an oven at 149 C for 70
6、h. Examine cover under a 7 power glass. 3.6 OVALITY, min 75% Ovality will be expressed as the ratio of the inside minor to major diameters times 100. ENGINEERING MATERIAL SPECIFICATIONESA-M2D50-B Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 2 of 3 3.7 PHYSICAL C
7、HARACTERISTICS (ASTM D 380) 3.7.1 Original Properties Tensile Strength, min 1250 psi (8.6 MPa) Ultimate Elongation, min 200% Modulus at 100%, min 225 psi (1.6 MPa) Hardness, Durometer “A“ 65-75 3.7.2 Aged Properties (70 h at 121 +/- 3 C) Tensile Strength, change, max -20% Ultimate Elongation change,
8、 max -60% Hardness, Durometer “A“, change, max +15% 3.7.3 Immersion in ASTM Reference Fuel “B“ (48 h at 23 +/- 2 C) Tensile Strength, change, max -60% Ultimate Elongation change, max -40% Volume Increase, max +60% 3.8 FLAMMABILITY Self extinguishing within one minute Test Method: Cut 1/4 in (6.4 mm)
9、 wide strips longitudinally. A Bunsen burner shall be used to start burning off the strips until approximately 1/2 in (13 mm) of the strip is burning vigorously. Remove the burning strip from the flame and hold it horizontally with the outside facing upward. The average time of at least 6 determinat
10、ions shall be used. The test shall be conducted in a draft free atmosphere. 3.9 TUBING IDENTIFICATION A colored tracer cord may be used for source identification. The color shall be determined between Purchasing and the supplier. The word “vapor“ and the coding described below shall appear on the ou
11、ter cover of the hose in contrasting color and repeated at interval of 2.25 in (57 mm) or less. Mandrel cured tube may be coded once per part. ENGINEERING MATERIAL SPECIFICATIONESA-M2D50-B Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 3 of 3 The following format is recommended: Example date: January 8, 1972
