1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 03 2015 01 16 Re-Activate See Summary of Revisions M. Katz, NA 2013 07 04 N-STATUS A. Wedepohl, NA 2003 01 08 Activated M. Masserant Controlled document at www.MATS Copyright 2015, Ford Global Technologies, LLC Page 1 of 3 TUBING, POLYOLE
2、FIN, HEAT SHRINKABLE, DUAL WALL, WSS-M99D56-A4 ADHESIVELY LINED, SEMI-RIGID, FLAME RETARDANT 1. SCOPE The material defined by this specification is a selectively cross-linked dual wall polyolefin tubing whose diameter shall reduce to a predetermined size upon application of heat in excess of 135 C.
3、The tubing shall be fabricated from a thermally stabilized, modified polyolefin composition, and shall be lined with a thermoplastic adhesive. 2. APPLICATION This specification was released originally for material used to seal electrical harness wire splices or electrical components such as fuse-lin
4、ks, diodes and resistors. 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 FORMED PARTS The tubing shall be fabricated from thermally stabilized,
5、modified polyolefin and shall be cross-linked. It shall be homogeneous and essentially free from flaws, defects, pinholes, bubbles, seams, cracks, and inclusions. 3.2.1 Dimensions As specified on (ASTM D 2671) engineering drawing Shall be specified before and after shrink. 3.2.2 Longitudinal Change
6、+0%, -10% (ASTM D 2671) 3.3 SPECIFIC GRAVITY 1.35 max (ASTM D 2671, outer wall only) 3.4 LOW TEMPERATURE FLEXIBILITY AT -30 C No cracking (ASTM D 2671, Procedure C, outer wall only) Test Method: Specimens of tubing, as supplied (sizes as described in ASTM D 2671, Procedure C) and a mandrel (see Tabl
7、e 1 for size) shall be conditioned for 4 h at -30 +/- 2 C. While at this temperature, the specimens shall be wrapped around the mandrel for at least 360 in approximately 2 s. ENGINEERING MATERIAL SPECIFICATION WSS-M99D56-A4 Copyright 2015, Ford Global Technologies, LLC Page 2 of 3 3.5 HEAT SHOCK 250
8、 C (ASTM D 2671, 150 mm specimen length) Specimens of tubing shall be conditioned for 4 h in a 250 +/- 5 C oven. The specimens shall be removed from the oven, cooled to 23 +/- 2 C, and then visually examined for evidence of dripping, flowing, or cracking in the polyolefin. Any side cracking caused b
9、y flattening of the specimen on the mandrel shall not constitute failure. 3.6 TENSILE STRENGTH AT MAX LOAD 10 MPa min (ASTM D 2671, 25 mm benchmarks, 50 mm initial jaw separation, 150 mm specimen length. 500 +/- 50 mm/ minute test speed, outer cross-section only) 3.6.1 Elongation at Break 200% min (
10、Test according to para 3.6) 3.7 SECANT MODULUS 225 MPa min (ASTM D 882, Procedure A at 2% strain, outer cross-section only, before shrink) 3.8 CONCENTRICITY Six 150 mm specimens of tubing, as supplied, shall be measured for min and max wall thickness. Concentricity shall be calculated as follows: Wm
11、in C = - x 100% Wmax Where: Wmin = Min wall thickness Wmax = Max wall thickness Concentricity as Supplied 60% min 3.9 COPPER MIRROR CORROSION No corrosion (ASTM D 2671, Procedure A, 16 h at 121 C) 3.10 DIELECTRIC STRENGTH 15 kV/mm min (ASTM D 2671, short time) 3.11 FLAMMABILITY (SAE J1128, para 6.6
12、Resistance to Flame Propagation or ISO 6722-1, para 5.22 Resistance to Flame Propagation) Shall not continue to burn for more than 8 sApply the flame at the lower end of the sealed splice, where the hot melt cable and tube are all visible. 3.12 COLOR Black jacket with white adhesive liner ENGINEERIN
13、G MATERIAL SPECIFICATION WSS-M99D56-A4 Copyright 2015, Ford Global Technologies, LLC Page 3 of 3 3.13 FOGGING (SAE J1756, 3 h at 100 C heating, 21 C cooling plate, post test conditioning 1 h and 16 h) Fog Number 80 min Formation of clear film, droplets or crystals is cause for rejection. 4. GENERAL
14、INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. Contact for questions concerning Engineering Material Specifications. TABLE 1 MANDREL DIMENSIONS FOR HEAT SHOCK AND LOW TEMPERATURE FLEXIBILITY Tubing Diameter of Mandrel in in (mm) 3/64 to 3/16 inclusive 1/2 (12.7) 1/4 to 1 inclusive 3/4 (19.1) 5. SUMMARY OF REVISIONS 2015 01 16 Re-activated and updated flammability
