1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Changes 2009 07 20 N-STATUS Replaced by WSS-M8P5-C L. Schmalz, NA 1992 09 30 C10176308 Clause 3.6.3 revised NJK 1992 06 19 C102223334 Released J.Joshi WP 3948-a Page 1 of 3 THREAD, POLYAMIDE, THREE PLY WSD-M15H42-B NO
2、T TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a polyamide thread manufactured as a single cord incorporating three separate plies. 2. APPLICATION This specification was released originally for material used as an underthread in multineedle sewing operations in th
3、e manufacture of automotive seat and/or trim assemblies or as specified on Engineering Drawings. 3. REQUIREMENTS In addition to the requirements quoted herein, this material must meet the requirements of the Performance Specification, WSD-M8P5-B, except clauses 3.6.1 U.V. DEGRADATION and 3.7 RESISTA
4、NCE TO FADE. 3.1 STATISTICAL PROCESS Suppliers must conform to the requirements of Ford Quality System Standard Q-101. A mutually acceptable Control Plan as described therein is required for material/source approval. Appropriate statistical tools must be used to analyze process/product data so that
5、variation in the final product is continuously reduced. 3.2 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSIS Ford Motor Company, at its option, may conduct infrared and/or thermal analysis of material/parts supplied to this specification. The IR spectra and thermogram established for initial appro
6、val shall constitute the reference standard and shall be kept on file at the designated material laboratory. All samples shall produce IR spectra and/or thermograms that correspond to the reference standard when tested under the same conditions. 3.3 CONDITIONING AND TEST CONDITIONS All test values i
7、ndicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. ENGINEERING MATERIAL SPECIFICATION WSD-M15H42-B WP 3948-b Page 2 of 3 3
8、.4 APPEARANCE (FLTM BI 109-01) The color, pattern, and finish shall match the approved Design Center master sample, or shall be as specified on the Engineering Drawing. 3.5 YARN CONSTRUCTION AND DESCRIPTION (ASTM D 1244) The thread is manufactured from three separate ends of 23.5 tex f34, multifilam
9、ent, bright, high tenacity polyamide 6.6 yarn. They are twisted together in reverse (Z) direction. 3.6 PHYSICAL REQUIREMENTS 3.6.1 Thread Size, range 80 +/- 6 tex (FLTM BN 150-01) 3.6.2 Tensile Strength, min 45 N (FLTM BN 150-01, 125 mm/minute) 3.6.3 Elongation at Break, range 16 - 24 % (FLTM BN 150
10、-01, 125 mm/minute) 3.6.4 Twist, range 230 - 420 turns/m (FLTM BN 150-01) 3.7 ADDITIONAL REQUIREMENTS Specific requirements for material and/or manufactured parts shall be specified on the Engineering drawing, Engineering parts specification and/or performance specifications. All critical areas with
11、 respect to these properties shall be clearly designated on the Engineering drawing. 3.8 SUPPLIERS RESPONSIBILITY All materials supplied to this specification must be equivalent in all characteristics to the material upon which approval was originally granted. Prior to making any change in the prope
12、rties, composition, construction, color, processing or labelling of the material originally approved under this specification, whether or not such changes affect the materials ability to meet the specification requirements, the Supplier shall notify Purchasing, Toxicology and the affected Materials
13、Engineering activity of the proposed changes and obtain the written approval of the Materials Engineering activity. Test data, test samples and a new code identification are to be submitted with the request. Substance restrictions imposed by law, regulations or Ford, apply to the materials addressed
14、 by this document. The restrictions are defined in Engineering Material Specification WSS-M99P9999-A1, unless a different suffix (e.g., A2 or A3) is specified on engineering document for the application. ENGINEERING MATERIAL SPECIFICATION WSD-M15H42-B WP 3948-b Page 3 of 3 4. APPROVAL OF MATERIALS M
15、aterials defined by this specification must have prior approval by the responsible Materials Engineering activity. Suppliers desiring approval of their materials shall first obtain an expression of interest from the affected Purchasing, Design and Materials Engineering activity. Upon request, the Su
16、pplier shall submit to the affected Materials Engineering activity a completed copy of their laboratory test reports, signed by a qualified and authorized representative of the test facility, demonstrating full compliance with all the requirements of this specification (test results, not nominal val
17、ues), the material designation and code number, and test specimens for Ford evaluation. Fords engineering approval of a material will be based on its performance to this specification and on an assessment of suitability for intended processes and/or applications. Upon approval, the material will be
18、added to the Engineering Material Approved Source List. 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of the sewing operations. 5.1 FINISH 7.0 +/- 2.0 % The finish shall consist of hard polyamide resin as a bonding agent a
19、nd a suitable lubricant, e.g., a polyethylene and silicone type. The primary criterion for acceptability of the finish shall be the threads sewability. Finish content outside this range may be considered acceptable providing that the amount of lubricant or resin does not adversely affect the sewability performance or yield of the thread. 5.2 PUT UP Nominal Length per Spool 22,000 m Alternative lengths may be supplied to suit manufacturing requirements.
