1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 08 20 N-STATUS No Replacement Named C. Mracna, NA 2004 07 19 Revised Para 3.0 inserted; para 3.4.5, 3.5 & 4 deleted 1974 10 15 Released COE2-CBE2-CDE2-CEE2-760020 Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, L
2、LC Page 1 of 3 ETHYLENE PROPYLENE RUBBER, HYDRAULIC ESA-M2D257-A BRAKE SYSTEM - SEALS NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is an ethylene propylene rubber having excellent non-mineral hydraulic fluid aging characteristics for use at high and low temperatu
3、res. 2. APPLICATION This specification was released originally for material used in seals and o-rings in the brake master cylinder. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Producti
4、on Materials (WSS-M99P1111-A). 3.1 CHEMICAL COMPOSITION The chemical composition of the rubber material must be 100% copolymer and/or terpolymer of ethylene propylene. Slab stock must accompany parts for analysis. The slab stock must be of the same compound batch and cured at equivalent cure cycles
5、of the parts supplied. 3.2 COLOR Black 3.3 SLAB STOCK AND BUTTON SPECIMENS 3.3.1 Original Properties Hardness - Durometer “A“ 65 - 75 (ASTM D 2240) Tensile Strength, min 1,500 psi (ASTM D 412) (10.3 MPa) Elongation, Ultimate, min 200% 3.3.2 Heat Aged (22 h at 175 +/- 2 C) Hardness - Durometer “A“ Ch
6、ange, max 0 to +12 Tensile Strength Change, max -15% Elongation Change, max -30% ENGINEERING MATERIAL SPECIFICATIONESA-M2D257-A Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 2 of 3 3.3.3 Immersion in Brake Fluid (ESA-M6C25-A) (22 h at 149 +/- 2 C) Hardness - Duro
7、meter “A“ Change, max -8 Tensile Strength Change, max -20% Elongation Change, max -20% Volume Change 0 to +10% 3.3.4 Immersion in Brake Fluid (ESA-M6C25-A) (7 days at 21 - 27 C) Volume Change No shrinkage 3.3.5 Compression Set (ASTM D 395, Method “B“, 22 h at 175 +/- 2 C, 25% deflection) Recovery, m
8、in 95% Set of Deflection, max 20% 3.3.6 Low Temperature Test at -54 C (5 h conditioning) Bend Test Must be (90 angle bend over square flexible with edge mandrel) no cracks 3.4 RUBBER PARTS 3.4.1 Hardness IRHD, see (ASTM D 1415) engineering drawing 3.4.2 Immersion in Brake Fluid (ESA-M6C25-A) (SAE J
9、1601, 22 h at 149 +/- 2 C) Hardness Change, max -8 IRHD Volume Change 0 to +10% Base Diameter Change 0 to +3.3% 3.4.3 Low Temperature Test at -54 C (SAE J 1601, except conditioning shall be for 5 h) Bend Test No cracks and shall return to its approx. original shape within 1 min. 3.4.4 Heat Aged (SAE
10、 J 1601, except aged for 22 h at 175 +/- 2 C) Hardness Change, max 0 to +10 IRHD ENGINEERING MATERIAL SPECIFICATIONESA-M2D257-A Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 3 of 3 5. GENERAL INFORMATION The information given below is provided for clarification a
11、nd assistance in meeting the requirements of this specification. 5.1 SERVICE TEMPERATURE The service temperature range for this material is -54 to 150 C. Maximum temperature of 175 C could be tolerated for short period of time. 5.2 BRAKE FLUID DESCRIPTION Brake fluid as referred to in this specification shall be virgin, fresh ESA-M6C25-A brake fluid. Suppliers can obtain fresh fluid in pint or quart containers at all Ford and Lincoln-Mercury dealerships.
