1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Para. No. Revisions1983 01 08 Released B3S-5152/CEN1 DR-501899-/WP 3948-a Page 1 of 3WEBBING, POLYESTER - TIE DOWN STRAP ESB-M7H33-A1. SCOPEThe material defined by this specification is a polyester webbing wovenwith continuous
2、 filament yarn and finished selvages. Proper dyes anddyeing procedures shall be employed to provide acceptable colors,appearance and physical properties. Color stripping for redyeing ofwebbing rejected for color is not allowed. The webbing shall be of goodquality and uniform construction.2. APPLICAT
3、IONThis specification was released originally for material used as a tiedown strap for moonroof stowage in 1983 passenger cars.3. REQUIREMENTS3.1 CONDITIONINGAll test values indicated herein are based on material conditionedin a controlled atmosphere of 23 2 C and 50 5% relativehumidity for 24 h pri
4、or to testing and tested under the samecontrolled conditions.3.2 APPEARANCE(FLTM BI 9-1)The color, pattern and finish shall match the approved DesignCenter master sample, or shall be as specified on the engineeringdrawing.3.3 WIDTH 24.1 - 27.9 mmAll other dimensions shall be as specified on the engi
5、neeringdrawing.3.4 CONSTRUCTION, min 154 ends/width(ASTM D 1910) 83 picks/100 mm3.5 COMPOSITION(ASTM D 629)Polyester 100%ENGINEERING MATERIAL SPECIFICATION ESB-M7H33-AWP 3948-b Page 2 of 33.6 YARN SIZE AND DESCRIPTION, min(ASTM D 1244)Warp (A) 93.3 tex f 70 Z 92 14 tpm x 2(B) 93.3 tex f 70 Z 92 14 t
6、pm x 2Fill (V) 93.3/1 tex f 70 O Twist3.7 WEIGHT, min 3.22 kg/100 m(FLTM BN 6-1)3.8 BREAKING STRENGTH, min(SAE J4c)Full Width 15.6 kN3.9 ELONGATION, max 12% at 8.0 kN(SAE J4c)3.10 RESISTANCE TO LIGHT, min 65%(SAE J4c)Retained breaking strength after 100 h weatherometer exposurewithout water spray.3.
7、11 RESISTANCE TO HEX BAR ABRASION, min 65%(SAE J4c)Retained breaking strength after 5,000 abrasion strokes (2,500cycles).3.12 RESISTANCE TO LIGHT - FADE3.12.1 Weatherometer 3.0 to 5 Rating(100 h without water spray)3.12.2 Fadeometer 3.0 to 5 Rating(FLTM BN 1-1, 120 SFH wet and/or15,750 langleys in F
8、loridaunder glass at a 45 anglefacing south)No individual yarn or combination of yarns shall fade,stain or exhibit any color tone change, nor shall the yarnschange in hue or brightness in excess of the above ratingsor the AATCC Gray Scale (10 Step) for Evaluating Change ofColor.3.13 COLORFASTNESS TO
9、 CROCKING, Wet and Dry 4.0 to 5 Rating(FLTM BN 7-1, using AATCC EvaluationProcedure 3)3.14 COLORFASTNESS TO STAINING-BLEEDING 4.0 to 5 Rating(FLTM AN 1-1, using AATCC EvaluationProcedure 3)ENGINEERING MATERIAL SPECIFICATION ESB-M7H33-AWP 3948-b Page 3 of 33.15 PERSPIRATION 4.5 to 5 Rating(FLTM AN 1-
10、1, using AATCC EvaluationProcedure 3)3.16 SPOTTING No spots shall remain after drying(FLTM AN 1-1) 3.17 FLAMMABILITYIn order to comply with Federal Motor Vehicle Safety Standard No.302, the materials portions of components, and composites shall notburn, or transmit a flame across it surface, at a ra
11、te of more than101 mm per min. To demonstrate compliance, the sample size andmethod of testing shall be in accordance with FLTM BN 24-2.3.18 PERFORMANCE - ENVIRONMENTAL AGINGAll materials, portions of components, and composites defined bythis specification that have not been treated, modified orrefo
12、rmulated and exceed a max burn rate of 76 mm per min asspecified by the Flammability Lot Sampling Plan of FLTM BN 24-2,must be evaluated for permanency of the materials flame retardantproperties per ESB-M25P3-A according to the acceleratedenvironmental aging requirements applicable to the basic mate
13、rialcategory of this particular specification.Any material, portions of components, and composites defined bythis specification that have been treated, modified or reformulatedto conform to Flammability Lot Sampling Plan of FLTM BN 24-2,regardless of max burn rate, must be evaluated for both permane
14、ncyof materials flame retardant properties and changes in mechanicalchemical and physical properties per ESB-M25P3-A applicable to thebasic material category of this particular specification.3.19 FLAMMABILITY TEST PROGRAMMaterials, portions of components, and composites governed by thisspecification
15、 must also comply with the requirements ofES-D3AB-11014-AA.3.20 SUPPLIERS RESPONSIBILITYMaterial supplied to this specification must be equivalent to thatoriginally approved. Changes in formulation or processing shall notbe made without prior approval as described in Supplier Procedure I-A.4. APPROV
16、AL OF SUPPLIERSSuppliers to this specification must be approved by the affected productengineering office. Procedure for gaining approval of a specific materialto a new/existing ES-M specification is contained in Supplier ProcedureI-A. Approved new suppliers will be added to the Engineering MaterialsApproved Source List.
