1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2005 05 27 Revised Inserted 3.0; Deleted 3.2, 3.3.1, 3.5 & 4 1979 01 10 Metricated, Renumbered and Retyped CHH2 823385 1976 11 11 Released BG2-5 Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 1 of 2 TUBING,
2、NYLON (TYPE 11 AND TYPE 12) ESA-M4D374-A 1. SCOPE The materials defined by this specification are low plasticized nylons Type 11 or 12. 2. APPLICATION This specification was released originally for fuel system tubing where low moisture absorption, dimensional stability, and low temperature impact re
3、sistance is required. 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). 3.1 CONSTRUCTION AND MATERIALS Material supplied to this specification must be
4、smooth and uniform, free from visible defects, foreign matter, kinks or seams, or any other condition that would impair the performance of the tubing. The tubing may be supplied in natural or pigmented form. The color is to be specified on engineering drawing. 3.3 MOLDED TEST SPECIMENS Test specimen
5、s may be injection molded or may be cut from injection molded slabs of suitable thickness. Nylon Type 11 Nylon Type 12 3.3.2 Specific Gravity 1.03 - 1.05 1.02 - 1.03 (ASTM D 792 or D 1505) 3.3.3 Melting Point, C min 185 175 (ASTM D 789) 3.3.4 Tensile Strength, psi (MPa), min 5,500 (37.9) 5,500 (37.9
6、) (ASTM D 638) 3.3.5 Elongation at Break, % min 200 200 (ASTM D 638) 3.3.6 Water Absorption, % max 2 2 Test Method: Precondition samples in a circulating air oven at 110 +/- 2 C for 24 h. Expose to 100% relative humidity at 25 +/- 2 C for 100 h. ENGINEERING MATERIAL SPECIFICATIONESA-M4D374-APrinted
7、copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 2 of 2 3.4 EXTRUDED PARTS Nylon Type 11 Nylon Type 12 3.4.1 Specific Gravity 1.03 - 1.05 1.02 - 1.03 (ASTM D 792 or D 1505) 3.4.2 Melting Point, C min 185 175 (ASTM D 789) 3.4.3 Water Absorption, % max 2 2 (Test method per pa
8、ra. 3.3.6) 3.4.4 Resistance to Zinc Chloride No cracks No cracks (SAE J 844) Samples shall show no evidence of cracks when viewed with a 7-power glass. Test Method: Sample shall be bent to its minimum bend radius and immersed in a 50% aqueous solution (by weight) of zinc chloride for 200 h at 23 +/- 2 C. 3.4.5 High Temperature Shrinkage, max 2% 2% Shrinkage shall not exceed 2.0% of its original length. Test Method: Condition a 12 in (300 mm) length of tubing by exposing to dry heat at 120 +/- 1 C for 168 h. 3.4.6 Impact Test at -40 C No visible cracks (SAE J 844) in the wall
