1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 200 09 29 N-STATUS No Replacement Named, No known use C. Mracna, NA 2004 10 22 Revised Inserted 3.0; Deleted 3.3, 3.4, 3.5 & 4 1972 06 29 Released MD/ETO35OQP1 Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page
2、1 of 3 CHLOROPRENE TUBE, NON-REINFORCED, SQ-M2D9031-AA VACUUM LINE TUBING NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a non-reinforced extruded chloroprene tubing. 2. APPLICATION This specification was released originally for material used for all vacuum line
3、s requiring a good resistance to the engine compartment environment and free of any visible wax bloom or other contaminations which may enter and deleteriously affect the vacuum system. 3. REQUIREMENTS (Except where noted, the following tests are to be conducted on full sections of tubing) The chara
4、cteristics of the parts to be supplied shall be in accordance with the requirements as specified herein in addition to those requirements specified on the released engineering drawing. 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Compan
5、ys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.1 ORIGINAL PROPERTIES 3.1.1 Hardness, Durometer A 65 - 75 (ASTM D 2240) Alternate Method, micro hardness, I.R.H.D 65 - 75 (ASTM D 1415) 3.1.2 Tensile Strength, min 10 MN/m23.1.3 Elongation at Break, min 200% Test Method for 3.1.2
6、and 3.1.3 ASTM D 412 - Except tubing is to be fastened in the tensile tester by means of knots tied in both ends with two washers fastened in the jaws. The tests shall be run until failure occurs. If the tubing fails in the knots or within 25 mm of the knots, then the tests should be re-run until fa
7、ilure occurs in the section between the knots. 3.1.4 Burst Pressure, min, for all diameters 1 MN/m2(ASTM D 380) ENGINEERING MATERIAL SPECIFICATIONSQ-M2D9031-AAPrinted copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 2 of 3 3.1.5 Vacuum Collapse The collapse of the outside d
8、iameter of the tubing under internal vacuum of 81 kN/m2for five minutes shall not exceed 30%. The test shall be made with the tubing curved to a radius equal to five times the max. outside diameter. 3.1.6 Wax Bloom 3.1.6.1 Waxy Hydrocarbons, max by weight 2.0% (ASTM D 297) 3.1.6.2 Wax Bloom There sh
9、all be no visible evidence of wax or any other contaminates exuding from the inside or outside diameter of the tubing. Condition a 150 mm section of tubing for 45 minutes at -40 C. Remove the specimen from the cold chamber and permit recovery to room temperature for one hour. The tubing shall then b
10、e twisted 360 for 10 successive cycles, after which the center 50 mm section shall be compressed 10 successive cycles by finger pressure or utilization of a compression device to full closure of the inside diameter. The tubing shall then be sectioned longitudinally and examined for evidence of wax b
11、loom or other contaminates. 3.1.7 Tear Resistance must not tear The tubing shall be expanded to a minimum internal diameter of two and a half times the nominal inside diameter, by forcing the tubing over a 30 tapered clean lubricated (silicon parting agent) metal cone that has a maximum finish of 0.
12、5 (CLA) roughness in micro metres. 3.2 ENVIRONMENTAL RESISTANCE 3.2.1 Cold Resistance The tubing shall not fracture nor show any cracks, checks or breaks. The tubing shall be subjected to a temperature of -40 C for a period of five hours after which the tubing shall be flexed in the cold chamber thr
13、ough 180 from the centerline in each direction to a diameter 10 times the maximum outside diameter of the hose at each extreme of cycle for five cycles. The rate of cycling shall be approximately one cycle in four seconds. 3.2.2 Ageing in ASTM Oil No. 1 After having been totally immersed in ASTM Oil
14、 No. 1 for 70 hours, with an oil temperature of 100 +/- 2 C, the tubing shall meet the requirements of para. 3.1.5 (Cold Resistance). ENGINEERING MATERIAL SPECIFICATIONSQ-M2D9031-AAPrinted copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 3 of 3 3.2.3 Ageing in ASTM Oil No.
15、3 Immerse sample for 70 hrs in ASTM Oil No 3 at 100 +/- 2 C (ASTM D 471). Hardness change -30 to 0 Units Tensile change, max -65% Elongation change, max -55% Volume change, max +70% 3.2.4 Heat Ageing After being subjected to dry air ageing in accordance with ASTM D 573 for 70 hours at 100 +/- 2 C th
16、e tubing must meet the following Vacuum collapse (after heat ageing) must meet requirements of para. 3.1.5. Cold resistance (after heat ageing) must meet requirements of para. 3.2.1. Hardness change, max +15 Units Tensile change, max -15% Elongation change, max -40% Tear resistance (Test per para. 3
17、1.7 to two times the nominal inside diameter) must not tear. Ozone resistance, max Rating 0 (FLTM BP 101-01), 3.2.5 Ozone Resistance 3.2.5.1 Ozone Resistance, max Rating 0 (FLTM BP 101-01) 3.2.5.2 Ozone Resistance with Plugs The “as received“ tubing (50 mm minimum length) shall be expanded to a min
18、imum internal diameter of twice the nominal inside diameter for a length of 25 +/- 3 mm by forcing the end of the tubing over the appropriate size metal mandrel. The expanded outside surface of the tubing shall be wiped with a cotton gauze wetted with naphtha to remove any wax or other foreign mater
19、ial which may affect the ozone test. The clean expanded tubing shall then be tested per FLTM BP 101-01. 3.2.6 Stress Relaxation Test A 50 mm length of tubing shall be expanded to two times the nominal inside diameter by inserting a steel mandrel for a length of 25 +/- 3 mm. The assembly shall be heat aged (ASTM D 573) at 100 +/- 2 C for 168 hours and then cooled to 23 +/- 2 C for one hour. Remove the steel mandrel, wait between 5 minutes and 30 minutes before performing the stress relaxation, the tubing inside diameter shall return to less than 1.65 times the original inside diameter.
