1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 00 2018 03 16 Released L. Click, NA Copyright 2018, Ford Global Technologies, LLC Page 1 of 4 TUBING, POLYPROPYLENE, EXTRUDED, SEMI-RIGID WSS-M99D70-A1 1. SCOPE The material defined by this specification is polypropylene sleeve extruded o
2、ver polyamide coated steel brake tubes. 2. APPLICATION This specification was released originally for material used as a barrier coating for protecting brake tubes from environmental and mechanical damage. 3. REQUIREMENTS 3.1 APPROVED SOURCES This specification requires the use of approved sources.
3、Only the sources identified on the Ford Approved Source List (ASL) can be used when this specification is listed on the drawing, CAD file, or other documents. The list of approved sources is located within Ford at or available externally through a Ford Materials Engineer. 3.2 CONDITIONING AND TEST
4、CONDITIONS Whenever possible, all test specimens shall be die-cut from the finished parts. When not feasible, specimen cut from molded test sheets manufactured from the same material and with equivalent cure to molded parts are recommended and need approval by Materials Engineering representative. U
5、nless stated otherwise, all test values are based on material conditioned for not less than 24 h prior to testing in a controlled environment of 23 +/- 2 C and 50 +/- 5% relative humidity. Testing of the material should occur in the conditioning environment or soon after removal. 3.3 FORMED PART DIM
6、ENSIONS The sleeve material shall be fabricated from extruded polypropylene, it shall be homogeneous and essentially free from flaws, defects, pinholes, bubbles, seams, cracks, and inclusions. 3.3.1 Dimensions As specified on (ASTM D 2671) engineering drawing.3.3.2 Longitudinal Change +/- 5% max (10
7、0 mm sample as supplied, immerse in 125 +/- 2 C glycol bath for 1 minute, cool and measure length.) 3.4 TENSILE STRENGTH AT MAXIMUM LOAD 11 MPa min (ASTM D 638, 20 mm benchmarks, 200 mm specimen length, 200 +/- 20 mm/min test speed) ENGINEERING MATERIAL SPECIFICATION WSS-M99D70-A1 Copyright 2018, Fo
8、rd Global Technologies, LLC Page 2 of 4 3.5 ELONGATION AT BREAK 300% min (Test per paragraph 3.4) 3.6 HEAT AGED (ASTM D 3045, 24 h at 120 +/- 2 C) 3.6.1 Tensile Strength at Maximum Load 11 MPa min (Test per paragraph 3.4) 3.6.2 Elongation at Break 270% min (Test per paragraph 3.4) 3.7 LOW TEMPERATUR
9、E FLEXIBILITY AT -30 C No cracks Condition at -30 C for 4 hours, bend tube 180 degrees around a mandrel with a 5X tube diameter radius. Examine for visible damage at maximum 10X magnification. 3.8 CONCENTRICITY Specimens of tubing, as applied, shall be measured for minimum and maximum wall thickness
10、 Concentricity shall be calculated as follows: C = Wmin/Wmax x 100% Where: Wmin = Minimum Wall Thickness Wmax = Maximum Wall Thickness 3.8.1 Concentricity as Supplied 60% min 3.9 COLOR Black or as specified on engineering drawing 3.10 DEFORMATION RESISTANCE 60% min Specimens of tubing, as applied,
11、shall be placed in an oven at 140 +/- 2 C for 10 minutes. After heating, load perpendicular to surface at 2 kg/cm for 5 minutes. Allow to cool in loaded condition. Calculate ratio of final wall thickness to original wall thickness. 3.11 IMPACT RESISTANCE No cracks Specimens of tubing, as applied, SA
12、E J2260 Section 7.5, room temperature and -40 C. Examine for visible damage at maximum 10X magnification. 3.12 ACID RESISTANCE No cracks Specimens of tubing, as applied, immerse six 100 mm samples in 35% by weight sulfuric acid at 50 +/-1 C for 20 days. Examine for visible damage at maximum 10X magn
13、ification. ENGINEERING MATERIAL SPECIFICATION WSS-M99D70-A1 Copyright 2018, Ford Global Technologies, LLC Page 3 of 4 3.13 GRAVELOMETRY (5 pints) Room temp and -40 C. No metal revealed 3.13.1 Room Temperature Gravelometer Test Method: Perform gravelometer testing per SAE J400 using five pints of gra
14、vel. No metal allowed to be visible after gravelometry. 3.13.2 Low Temperature Gravelometer Test Method: The tube is to be conditioned at -40 C for a minimum of four hours prior to performing gravelometer as specified in 3.13.1. Sample should be impacted with gravel within 30 seconds of removal from
15、 freezer. 3.14 PULL OFF FORCE, 75mm engagement length 300N min Measure required force necessary to remove extruded PP sleeve from straight section of PA12/PA612 covered brake line. Do not cut or modify PP to PA interface, removal of PA covered tube and PP extrusion is allowed outside of 75mm test se
16、ction to aid in test set-up. 4. GENERAL INFORMATION This information given below is provided for clarification and assistance in meeting the requirements of this specification. Contact for questions concerning Engineering Material Specifications. 4.1 APPROVAL OF MATERIALS Suppliers desiring approva
17、l of their materials shall first obtain an expression of interest from Purchasing, Design or Product Development, and Materials Engineering. The supplier shall submit a completed copy of their laboratory test reports, signed by a qualified and authorized representative of the test facility, demonstr
18、ating full compliance with all the requirements of the Material Specification. Tested material samples must be available for review upon request and kept for a minimum of one year. Upon request, the supplier will review the associated quality control documents (Process Failure Mode and Effects Analy
19、sis, Control Plans, Certification testing) with Ford. 4.2 SUPPLIERS ONGOING RESPONSIBILITY All materials must be equivalent in all characteristics to the material upon which approval was originally granted. Prior to making any changes to the material originally approved, whether or not such changes
20、affect the materials ability to meet the specification requirements, the supplier shall notify the affected Supplier Technical Assistance (STA), Purchasing, and Materials Engineering activities of the proposed changes (with reasons) by submission of a completed Suppliers Request for Engineering Appr
21、oval, SREA. For parts and components using Ford Engineering Material Specifications, all samples tested to the specifications for Design Verification (DV), Production Verification (PV) and Production Part Approval Process (PPAP) sign off must be kept until Job 1. 4.3 RESTRICTED SUBSTANCE MANAGEMENT
22、STANDARD ENGINEERING MATERIAL SPECIFICATION WSS-M99D70-A1 Copyright 2018, Ford Global Technologies, LLC Page 4 of 4 Substance restrictions imposed by regulations or Company direction applies to the materials addressed by this document. The restrictions are identified in the Restricted Substance Mana
23、gement Standard WSS-M99P9999-A1, which is updated yearly. It is the suppliers responsibility to comply with this standard on a continuing basis through IMDS and or GMAP reporting. 4.4 DRAWING CALLOUT Example drawing callout for the tube and coating materials for brake and fuel lines: BRAZED DOUBLE WALL LOW CARBON STEEL TUBE PER SAE J527, NOMINAL O.D. X.XX. COAT WITH ZINC/ALUMINUM ALLOY PLUS EXTRUDED PA612 PER WSS-M21P30-A1, MAXIMUM COATED POLYPROPYLENE TUBE O.D. PER WSS-M99D70-A1
