1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Changes 2014 10 21 N Status No replacement named L. Sinclair, NA 1998 06 01 Activated A. Vallabhanath WP 3948-a Page 1 of 5 SEALANT, SILICONE RUBBER, ULTRAVIOLET AND WSF-M4G351-A2 MOISTURE CURED NOT TO BE USED FOR NEW
2、 DESIGN 1. SCOPE The material defined by this specification is a one component, self leveling silicone rubber sealant which will cure by exposure to ultraviolet radiation and moisture. 2. APPLICATION This specification was released originally as a connector pin sealant. 3. REQUIREMENTS 3.1 QUALITY S
3、YSTEM REQUIREMENTS Material suppliers and part producers must conform to Quality System Requirements, QS-9000. Material specification requirements are to be used for initial qualification of materials. A Control Plan for ongoing production verification is required. This plan must be reviewed and app
4、roved by the relevant Ford Materials activity and/or Ford Supplier Technical Assistance (STA) prior to production parts submission. Appropriate statistical tools must be used to analyze process/product data and assure consistent processing of the materials. Part producers using this material in thei
5、r products, must use Ford approved materials and must conform to a process control plan which has been approved by STA and/or the relevant Materials Activity. 3.2 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSIS Ford Motor Company, at its option, may conduct infrared and/or thermal analysis of mat
6、erial/parts supplied to this specification. The IR spectra and thermograms established for initial approval shall constitute the reference standard and shall be kept on file at the designated material laboratory. All samples shall produce IR spectra and thermograms that correspond to the reference s
7、tandard when tested under the same conditions. ENGINEERING MATERIAL SPECIFICATION WSF-M4G351-A2 WP 3948-b Page 2 of 5 3.3 CONDITIONING AND TEST CONDITIONS All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 % relative humidity for
8、not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. 3.4 COLOR Fluorescent, yellow/green 3.5 DENSITY, range 0.98 - 1.03 (ISO 1183, Method A/ASTM D 1475) g/cm3 3.6 VISCOSITY, range 4000 - 7500 (ASTM D 1084, Method B, Model RVT, Spindle 3, mPa.s 10 rpm)
9、3.7 CURE RATE (ASTM C 679) Tack Free, max 90 s Dispense a 203.2 x 203.2 x 3.175 mm sample of product onto a polyethylene surface. Set the UV light source to 75 mW/cm2 at 365 nm. Expose the sample under UV light source for the amount of time required to ensure that a 25.4 x 76.2 x 0.0381 mm polyethyl
10、ene strip loaded with a 85 g weight for 5 s does not adhere to the materials when the polyethylene strip is removed from the material at a 90 degree angle. Record the time that two consecutive samples have demonstrated tack free at one interval. Depth of Cure, min 2.3 mm Dispense enough material int
11、o an aluminum weighing dish such that the sample will not cure through its entire depth. Set the UV light source to 180 mW/cm2 at 365 nm. Expose the sample under the UV light source for 30 s. After curing, remove the sample from the aluminum dish and carefully scrape away the bottom uncured material
12、. With the bottom of the cured dish facing the UV source repeat the above UV exposure for 30 s. Measure the thickness of the cured disk to the nearest 0.025 mm using a dial micrometer or equivalent. Report the average of three replicates for the UV depth of cure. ENGINEERING MATERIAL SPECIFICATION W
13、SF-M4G351-A2 WP 3948-b Page 3 of 5 3.8 MECHANICAL PROPERTIES 3.8.1 Sample Preparation A cured sheet of silicone sealant shall be prepared by placing 37 +/- 0.5 grams of uncured silicone sealant in a ASTM flat sheet mold (152.4 x 152.4 x 3.18 mm) with a polyethylene lined glass sheet on either side.
14、The assembly shall be clamped together with 4 number 1 spring clamps. Allow the assembly to rest for 10 minutes so that excess material can escape from the mold. The sample shall then be exposed to 75 mW/cm of ultraviolet radiation (200 to 400 nm spectrum with a primary wavelength of 365 nm) for 60
15、seconds on each side. The silicone sheet shall then be removed from the mold and conditioned at 23 +/- 2 C and 50 +/- 5 % relative humidity for 72 h. 3.8.2 Tensile Strength, min (ISO 37/ASTM D 412, Die C) . As cured 600 kPa . After 24 h at 260 +/- 3 C 300 kPa 3.8.3 Elongation, min (ISO 37/ASTM D 412
16、, Die C) . As cured 75 % . After 24 h at 260 +/- 3 C 35 % 3.8.4 Hardness, Durometer A, range (ISO 868/ASTM D 2240) . As cured 32 - 50 . After 24 h at 260 +/- 3 C, max + 15 points 3.9 TOTAL SILICONE VOLATILE (FLTM AV 102-01, report D4 through D 10 and L4 through L10) . D4 through D10 0.42 % . L4 thro
17、ugh L10 1.27 % 3.10 SHEAR ADHESION, min 50 kPa (ISO 4587/ASTM D 1002) The sealant shall fail cohesively when tested in lap shear. The sealant shall be bonded between brass strips which have 0.5 to 2.0 micrometers of mechanically wiped tin. The adhesive layer shall be 0.25 mm thick. ENGINEERING MATER
18、IAL SPECIFICATION WSF-M4G351-A2 WP 3948-b Page 4 of 5 3.11 CHEMICAL RESISTANCE (ISO 1817/ASTM D 471, except prepare sample per para 3.8.1) The volumetric swell shall be measured on cured sample of sealant max. 3.11.1 Engine Coolant 0.5 % (48 h at 40 +/- 2 C) 50 % WSE-M97B44-B*, 50 % water. 3.11.2 SA
19、E 10W30 Oil, WSE-M2C903-A2* 35 % (48 h at 150 +/- 2 C) 3.11.3 Gasoline, ESE-M4C89-F1* 100 % (48 h at 23 +/- 2 C) 3.11.4 Brake Fluid, ESA-M6C25-A* 15 % (48 h at 40 +/- 2 C) *Or currently released equivalent fluid (see para 5.3). 3.12 SHELF LIFE There shall be no loss in properties for 3 months from t
20、he date of receipt by the customer when stored in the original container at no higher than 38 C and 50 % relative humidity. 3.13 ADDITIONAL REQUIREMENTS Specific requirements for material and/or manufactured parts shall be specified on the Engineering drawing, Engineering parts specification and/or
21、performance specification. All critical areas with respect to these properties shall be clearly designated on the engineering drawing. 3.14 SUPPLIERS RESPONSIBILITY All materials supplied to this specification must be equivalent in all characteristics to the material upon which approval was original
22、ly granted. Prior to making any change in the properties, composition, construction, color, processing or labeling 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
23、Purchasing, Toxicology and the affected Materials 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. ENGINEERING MATERIAL SPECIFICATION WSF-M4G
24、351-A2 WP 3948-b Page 5 of 5 Substance restrictions imposed by law, regulations or Ford, apply to the materials addressed by this document. The regulations are defined in Engineering Materials Specification WSS-M99P9999-A1. 4. APPROVAL OF MATERIALS Materials defined by this specification must have p
25、rior 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 Supplier shall submit to the affected Materials Engi
26、neering 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 values), the material designation and code number, an
27、d 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 added to the Engineering Material Approved Source
28、List. 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 GLASS TRANSITION TEMPERATURE, Tg, nominal - 34 C (ASTM E 831) 5.2 COEFFICIENT OF LINEAR THERMAL EXPANSION, 460 E-6/ C nominal (ASTM E 831 or TM
29、A) 5.3 For information on currently approved fluids used in para 3.11 of this specification contact: Materials Laboratory 13/100 Fluids Materials Section Research & Engineering Centre Coolants/Greases Ford Motor Company Ltd. Engine Engineering Laindon, Basildon P.O. Box 2053 Essex SS15 6EE, England 21500 Oakwood Blvd. Dearborn, MI 48121, USA Materials Engineering Product Engineering Office Ford Motor Co. of Australia Ltd. Princes Highway, Norlane Victoria 3214, Australia
