1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Para No. Revisions Rev 02 2012 04 12 N Status No replacement or usage N. Benipal, NA 1978 08 02 Metricated, Renumbered & Retyped CE3H-RD782440E Supp #5 1978 01 23 Released CE3H-DC744251-E Page 1 of 2 GASKET, CELLULOSE FIBER/
2、NITRILE RUBBER/CORK-NON-WICKING ESE-M8G148-A NOT TO BE USED FOR NEW DESIGN 1. SCOPE: The material defined by this specification is a non-wicking, gasoline resistant material composed of cellulose fibers bonded with nitrile rubber with cork filler and coated entirely with a nitrile rubber latex and a
3、 release agent. 2. APPLICATION: This specification was released originally for material used as the carburetor float bowl gasket. 3. REQUIREMENTS: All tests shall be conducted in accordance with ASTM F 104, Type 3 materials unless otherwise specified. Test specimens are to be selected from finished
4、gaskets when practicable. 3.1 CONSTRUCTION The gasket must be cut from a beater add sheet of cellulose fibers bonded with nitrile rubber and cork filler, then coated with nitrile rubber so the finished gasket is encapsulated with the rubber coating. A release agent is next applied to all surfaces. 3
5、2 COMPRESSIBILITY 20 - 35% (ASTM F 36, 1000 psi (6.9 MPa) load) Recovery, min 45% 3.3 TENSILE STRENGTH, min 1250 psi (8.6 MPa) 3.4 IMMERSION IN LIQUIDS (22 h at 23 +/- 2 C) Thickness Weight Immersion Fluid Increase, max Increase, max ASTM Fuel “C“ 25% 60% ASTM Oil No. 3 4% 20% Distilled Water 20% 3
6、0% 3.5 DENSITY, min 47-52 lb/ft3 (750-830 kg/m3) (ASTM D 297) ENGINEERING MATERIAL SPECIFICATION ESE-M8G148-A Page 2 of 2 3.6 SEALABILITY, max 0.6 cc/h (ASTM F 37, except Fuel “C“) (Pressures - External 250 psi (1.7 MPa) - Internal 15 psi (0.10 MPa) 3.6.1 Supplier Certification Suppliers shall certi
7、fy that the gasket material has been tested and meets Ford Motor Company sealability requirement as stated in this specification. Certification shall be by the suppliers Director of Research and Development or other authorized technical official. 3.7 DIMENSIONAL STABILITY Test Method: Three test spe
8、cimens approximately 1 x 7-1/2 in (25 x 191 mm) are cut from sample sheets. Specimens from finished gaskets may differ in width and length and should not include bolt holes. These specimens are preconditioned in a controlled humidity room or in a closed chamber with gentle mechanical circulation of
9、the air for 70 h minimum at 21 to 29 C and 50-55% relative humidity. Specimens are then measured for original length. Expose vertically hung test specimens in a controlled temperature and humidity chamber for 7 days at 38 C and 95-100% R.H., followed by 7 days at 38 C and 5-10% R.H. Length of test s
10、pecimens is measured after each of these two 7 day exposure periods. Average percent change in length after each exposure is calculated based on the original sample lengths previously determined. Permissible dimensional changes are as follows: After 7 Days . At 38 C and 95-100% R.H., max +2.2% . At
11、38 C and 15-20% R.H., max -1.0% 3.8 SUPPLIERS RESPONSIBILITY Material supplied to this specification must be equivalent to that originally approved. Changes in formulation or processing shall not be made without prior approval as described in Supplier Procedure I-A. 4. APPROVAL OF SUPPLIERS: Supplie
12、rs to this specification must be approved by the affected product engineering office. Procedure for gaining approval of a specific material to a new/existing ES-M specification is contained in Supplier Procedure I-A. Approved new suppliers will be added to the Engineering Materials Approved Source List.
