1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 09 22 N-STATUS No Replacement Named, No known use C. Mracna, NA 2004 10 22 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.7 & 4 2000 05 26 Activated A. Reaume Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC P
2、age 1 of 3 GASKET, SILICONE (VMQ), TWO COMPONENT, WSS-M2D497-A1 FORMED-IN-PLACE, LIQUID INJECTION SEALING/SYSTEM (FIP, LIM/LIS) NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is rapid cure, room temperature, two component liquid injection silicone rubber gasket sys
3、tem. 2. APPLICATION This specification was released originally to define the materials which, when mixed and injected into a sealing application such as oil pump, oil pan, rocker arm cover, front cover and similar assemblies, form an in-situ confined gasket in lieu of a conventional heat-cured elast
4、omeric seal or gasket. These are typically assemblies that, when fastened in place, have a groove or channel contained within that acts as the gasket mold. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard R
5、equirements For Production Materials (WSS-M99P1111-A). 3.4 MATERIAL TESTING AND SPECIMEN PREPARATION See description of tests below and summary of requirements, Table 1. Test specimens may be taken from either test sheets or molded parts. Molded test sheets having and equivalent formulation and cure
6、 as the finished article shall be 150 x 150 mm and 2.0 +/- 0.2 mm thick. In cases where gasket lengths are insufficient to accommodate tensile specimen preparation using ISO 37/ASTM D 412 Die C, reduced gage length and width dies may be used. Specimens taken from actual parts should be buffed or spl
7、it using a band knife splitter (preferred) to achieve proper thickness and uniformity. However, buffing vs splitting, different gage lengths and widths may yield different results so consistancy in method is important. 3.5 UNPOLYMERIZED COMPONENT CHARACTERISTICS (PARTS A AND B) 3.5.1 Color (As speci
8、fied on engineering drawing) 3.5.2 Extrusion Rate, g/minute, minimum 300 Test Method: Extrude a sample of each component for 6 s through an orifice having a 3.2 +/- 0.13 mm diameter and a 50 mm length. The pressure of 620 kPa shall be used with a #250 Semco gun or equivalent and 170 gram PE cartidge
9、 assembly. Discard approximately 50 mm of material. Then extrude into a pre-weighed container for 6 seconds using a stop watch or laboratory timer. Weigh the amount of material extruded within the 6 second time interval. Extrusion Rate = 10X extruded weight in grams. Report the median of three deter
10、minations. ENGINEERING MATERIAL SPECIFICATIONWSS-M2D497-A1 Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 2 of 3 3.5.3 Cure Rate 3.5.3.1 Cure Rate at 26 C, minutes, max Sealed Torsion Strain Rotorless Curemeter (ASTM D5289) MDR-2000 Rheometer or equivalent Oscilla
11、tion Arc: +/- Oscillation Frequency: 100 minute-1dN-m inch-Lbf TS1.13TS1 8 TS2.26 TS2 12 TS4.52 TS4 20 TS20.32 TS18 35 3.5.3.2 Cure Rate, Differential Scanning Calorimetry (15 - 20 mg sample, heat from -50 to 300 C in Nitrogen at 20 C/minute. Use a fresh sample for each run. Mix equal amount of each
12、 component. Total elapsed time of mixing, injection, weighing, and start of analysis not to exceed 3 minutes.) Reaction Peak Maximum, C 65 +/- 1 C 3.6 CURED MATERIAL PROPERTIES 3.6.1 Original Properties (After cure 22 h at 23 C) 3.6.1.1 Hardness 87 +/- 5 (ISO 868/ASTM D 2249, Instantaneous) 3.6.1.2
13、International Hardness 88 +/- 6 (IRHD, ISO 48/ASTM D 1415 3.6.1.3 Tensile Strength, MPa, min 4.5 (ISO 37/ASTM D 412, Die C) 3.6.1.4 Elongation at Break, %, min 20 (ISO 37/ASTM D 412, Die C) 3.6.1.5 Modulus at 10% elongation, 2.0 MPa, min (ISO 37/ASTM D 412, Die C) 3.6.1.6 Modulus at 20% elongation,
14、3.5 MPa, min (ISO 37/ASTM D 412, Die C) 3.6.2 Change in Properties After Air Aging 1000 hours at 150 C (ASTM D 573/ISO 188) 3.6.2.1 Hardness Change, points/ +10 degrees, max ENGINEERING MATERIAL SPECIFICATIONWSS-M2D497-A1 Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC
15、Page 3 of 3 3.6.2.2 Tensile Strength Change, -50 %, max 3.6.2.3 Elongation Change, %, max -60 3.6.3 Change in Properties After Aging in Service Fluid 105, 1000 hours at 150 C (ISO 1817/ASTM D 471) 3.6.3.1 Hardness Change, points/ -20 degrees, max 3.6.3.2 Tensile Strength Change, -65 %, max 3.6.3.3 E
16、longation Change, %, max -65 3.6.3.4 Volume Change, % +8 to +25 3.6.4 Change in Properties After Aging in Synthetic Engine Oil (Mobil 1 BAT), 1000 hours at 150 C, (ISO 1817/ASTM D 471) 3.6.4.1 Hardness Change, points/ -25 degrees, max 3.6.4.2 Tensile Strength Change, %, max -65 3.6.4.3 Elongation Ch
17、ange, %, max -65 3.6.4.4 Volume Change, % +8 to +25 3.6.5 Shrink, %, max 0 Test Method: Extude a bead 100 mm in length on an oiled, steel test panel. Allow to cure 24 hours at 23 C. Measure to the nearest 0.1mm. Calculate linear shrink as follows: Initial length - final length /initial length X 100
18、= % shrink. 3.6.6 Cross Link Density, %, max 60 (Toluene Immersion, 22 hours at 23 C, Volume Change per ISO 1817/ASTM D 471) 3.6.7 Total Silicone Volatiles, %, max 0.5 (FLTM AV 102-01, cured 24 h at 23 C) 5. GENERAL INFORMATION Note concerning paragraph 5.1: Although this test is not a requirement o
19、f the specification, it is requested for use in addressing design and application issues and/or possible inclusion in this specification in the future. Sampling frequency should initially be performed on each lot until material and test variation is established. Thereafter, the frequency is discretionary according to accepted statistical process capability practices(SPC). 5.1 Coefficient of Thermal Expansion (TMA), -40 through +200 C 2.6 +/- 0.4 X 10-4per C 6. RECYCLING INFORMATION Silicone Elastomer: VMQ
