1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Para No. Revisions 2012 04 12 N Status No usage or replacement N. Benipal, NA 1978 10 17 Metricated, Renumbered & Retyped CE3H-RD782440E-Supp #11 1963 06 25 Released F6-1073 Page 1 of 2 GASKET, CELLULOSE FIBER/NITRILE BUTADI
2、ENE RUBBER-HARD ESF-M8G74-A NOT TO BE USED FOR NEW DESIGN 1. SCOPE: The material defined by this specification is a compressible sheet packing consisting of vegetable fibers and suitably compounded nitrile butadiene rubber. It is recommended for applications where surface flange conditions are rough
3、 and operating pressures are above normal. 2. APPLICATION: This specification was released originally for material used as a carburetor fuel bowl gasket and support assembly carburetor booster venturi gasket. 3. REQUIREMENTS: All tests shall be conducted in accordance with ASTM F 104, Type 3 materia
4、l, unless otherwise specified. 3.1 TENSILE STRENGTH, min 3000 psi (20.7 MPa) 3.2 DENSITY, min 50 lb/ft3 (801 kg/m3) 3.3 COMPRESSIBILITY 6 - 16% (ASTM F 36, 1000 psi (6.9 MPa) load) Recovery, min 45% (20 psi (138 kPa) preload) 3.4 IMMERSION IN LIQUIDS (22 h at 23 +/- 2 C) Thickness Weight Immersion F
5、luid Change, max Change, max ASTM Oil No. 3 5% 25% ASTM Reference Fuel “B“ 15% 30% Distilled Water 25% 30% 3.5 COMPRESSION SET, max 20% (ASTM D 395, Method “A“, 22 h at 68 C) 3.6 SUPPLIERS RESPONSIBILITY Material supplied to this specification must be equivalent to that originally approved. Changes
6、in formulation or processing shall not be made without prior approval as described in Supplier Procedure I-A. ENGINEERING MATERIAL SPECIFICATION ESF-M8G74-A Page 2 of 2 4. APPROVAL OF SUPPLIERS: Suppliers 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.
