1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 09 22 N-STATUS No Replacement Named, No known use C. Mracna, NA 2004 10 21 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.10, 3.11 & 4 1995 12 19 Activated E. Duda Printed copies are uncontrolled Copyright 2009, Ford Global Technologies,
2、LLC Page 1 of 3 HYDROGENATED ACRYLONITRILE BUTADIENE (HNBR) WSS-M2D493-A1 O-RING, COMPRESSED NATURAL GAS NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a hydrogenated acrylonitrile butadiene rubber compound with fair resistance to engine oil, good resistance to
3、ozone and heat aging and excellent resistance to compressed natural gas. 2. APPLICATION This specification was released originally for material used as a standard O-ring for compressed natural gas applications. This material remains flexible at -40 C when heat aged or saturated with natural gas, oil
4、 or coolant. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.4 MATERIAL TESTING 3.4.1 Preparation of Test Specimens Whenever possible, all test spe
5、cimens shall be die-cut from the finished parts. When not feasible, specimens cut from molded test sheets manufactured from the same material and with equivalent cure to molded parts are recommended. The test sheets shall have the following dimensions: 150 x 150 mm, min x 2.0 +/- 0.2 mm 3.5 ORIGINAL
6、 PROPERTIES 3.5.1 Hardness, International 65 - 75 (ISO 48/ASTM D 1415) 3.5.2 Hardness, Durometer A 70 - 80 (ISO 868/ASTM D 2240, instantaneous, plied-up specimen. Hand held durometers shall not be used) 3.5.3 Tensile Strength, min 10.0 MPa (ISO 37/ASTM D 412, Die C) 3.5.4 Elongation at Break, min 20
7、0% (Test Method according to para 3.5.4) ENGINEERING MATERIAL SPECIFICATIONWSS-M2D493-A1Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 2 of 3 3.5.5 Modulus at 100% Elongation 2.0 - 5.0 MPa (Test Method according to para 3.5.4) 3.5.6 Ozone Resistance, max Rating 0
8、FLTM BP 101-01, Procedure A) 3.5.7 Compression Set, max 50% (ISO 815/ASTM D 395, Method B, except 25% compression, plied-up specimens, 168 h at 125 +/- 2 C) 3.5.8 Low Temperature Flexibility, min -38 C (ASTM D 1329, TRIO) 3.5.9 Density, g/cm31.2 - 1.3 (ASTM D 297) 3.6 HEAT AGED (ISO 188/ASTM D 573,
9、 150 +/- 50 air changes/h, 1000 h at 125 +/- 2 C) 3.6.1 Hardness Change 0 to 18 3.6.2 Tensile Strength Change +/- 15% 3.6.3 Elongation at Break Change, max -40% 3.7 IMMERSION IN FUEL A (ISO 1817/ASTM D 471, 70 h at 23 +/- 2 C) 3.7.1 Hardness Change, max -18 3.7.2 Tensile Strength Change, max -55% 3.
10、7.3 Elongation Change, max -35% 3.7.4 Volume Change, max +25% 3.7.4.1 Dry Out, Shrinkage, max -15% (24 h at 80 +/- 2 C, Use specimens from 3.7.4) 3.8 IMMERSION IN COMPRESSED NATURAL GAS (ISO 1817/ASTM D 471, 168 h at 23 +/- 2 +150 psi) 3.8.1 Hardness Change, max -10 3.8.2 Tensile Strength Change, ma
11、x -15% 3.8.3 Elongation Change, max 0 to +6% 3.8.4 Volume Change, max 0 to +2% 3.8.4.1 Dry Out, Shrinkage, max (24 h at 80 +/- 2 C Use Specimens from 3.8.4) ENGINEERING MATERIAL SPECIFICATIONWSS-M2D493-A1Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 3 of 3 3.9 IM
12、MERSION IN OIL IRM 903 (ISO 1817/ASTM D 471, 168 h at 125 +/- 2 C) 3.9.1 Hardness Change -25 3.9.2 Tensile Strength Change, max -55% 3.9.3 Elongation Change, max -30% 3.9.4 Volume Change +45% 3.9.5 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 RECYCLING CODE HNBR
