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1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions 2004 09 30 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.12 & 4 1993 09 30 Para 3.10 -A revisedC10258828 1991 08 09 Released C10155132 Printed copies are uncontrolled Copyright 2004, Ford Global Technologies, LLC Page 1 of 3 POLYACRYLIC RUBB
2、ER (ACM), HOT AIR, HOT OIL AND WSD-M2D448-A COMPRESSION STRESS RELAXATION RESISTANT, 50 IRHD POLYACRYLIC RUBBER (ACM), HOT AIR, HOT OIL AND WSD-M2D448-A2 COMPRESSION STRESS RELAXATION RESISTANT, 65 IRHD 1. SCOPE The materials described by these specifications are 50 IRHD (WSD-M2D448-A) and 65 IRHD (
3、WSD- M2D448-A2) polyacrylic rubber compounds with good resistance to hot air and hot oil. The materials have excellent resistance to compressive stress relaxation at temperatures up to 135 C. WSD- M2D448-A material also has excellent resistance to splitting or bursting under combined conditions of c
4、ompressive strains up to 60% and temperatures up to 150 C. 2. APPLICATION These specifications were released originally for material used as an intercooler tank gasket and O- rings or as shown on the engineering drawing 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material supp
5、liers 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 specimens shall be die-cut from the finished parts. When not feasible, specimens cut from molded
6、 test sheets manufactured from the same material and with equivalent state of 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 PROPERTIES A A2 3.5.1 Hardness, International 45 - 55 65 - 70 (ISO 48) 3.5.2 Tensil
7、e Strength, MPa, min 8 10 (ISO 37, Type 1 dumbell) 3.5.3 Elongation at break, %, min 200 100 (Test Method according to para 3.5.2) 3.5.4 Modulus at 100% Elongation, MPa 2.0 - 3.5 6.0 - 7.5 (Test Method according to para 3.5.2) ENGINEERING MATERIAL SPECIFICATION WSD-M2D448-A/A2 Printed copies are unc
8、ontrolled Copyright 2004, Ford Global Technologies, LLC Page 2 of 3 A A2 3.5.5 Ozone Resistance, Rating, max 0 0 (FLTM BP 101-01, Procedure A) 3.5.6 Compression Set, %, max 35 35 (ISO 815, Sample A) except 25% compression, plied-up specimens, 70 h at 135 +/- 2 C) 3.6 HEAT AGED (ISO 188, 150 +/- 50 a
9、ir changes/h, 168 h at 150 +/- 2 C) 3.6.1 Hardness Change 0 to +10 3.6.2 Tensile Strength Change, max -20% 3.6.3 Elongation at Break Change, max -35% 3.6.4 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 3.7 HEAT AGED (ISO 188, 150 +/- 50 air changes/h, 1,000 h at 1
10、35 +/- 2 C) 3.7.1 Hardness Change 0 to +10 3.7.2 Tensile Strength Change, max -20% 3.7.3 Elongation at Break Change, max -35% 3.7.4 Visual Evaluation No surface tackiness or cracks when folded flat against itself. 3.8 IMMERSION IN OIL No. 1 (ISO 1817, 168 h at 150 +/- 2 C) 3.8.1 Hardness change +/-
11、10 3.8.2 Tensile Strength Change, max -20% 3.8.3 Elongation at Break Change, max -30% 3.8.4 Volume Change -5 to +5% 3.8.5 Visual Evaluation No surface tackiness or cracks when folded flat against itself. ENGINEERING MATERIAL SPECIFICATION WSD-M2D448-A/A2 Printed copies are uncontrolled Copyright 200
12、4, Ford Global Technologies, LLC Page 3 of 3 3.9 IMMERSION IN OIL No. 3 (ISO 1817, 168 h at 150 +/- 2 C) 3.9.1 Hardness change +/- 15 3.9.2 Tensile Strength Change, max -15% 3.9.3 Elongation at Break Change, max -20% 3.9.4 Volume Change 0 to +25% 3.9.5 Visual Evaluation No surface tackiness or crack
13、s when folded flat against itself. 3.10 COMPRESSION STRESS RELAXATION (FLTM BP 116-02 at 25% compression) Test Method: Measure the initial back-force (Fo) after 30 minutes at 23 +/- 2 C. Age at 135 +/- 2 C and take back-force (Ft) measurements at 23 +/- 2 C after 24, 48, 96, 168 h and thereafter eve
14、ry 168 h until a total elapsed test time of 1,000 h has been completed. Plot Ft against log 10 time in hours. - Fo -A -A2 F1000/Fo, min 0.20 0.20 3.11 FINISHED PART (A only) 3.11.1 Compression Burst No splits or cracks in any of the samples Test Method: Cut the 4 corners from each of 5 tank gaskets such that the test pieces have arms 15 +/- 2 mm in length, (or take 5 O-Rings as appropriate). Compress between metal plates by 60 +/- 2% (40 +/- 2% for O-Rings) of the original thickness. Age for 24 hours at 150 C, cool, release compression and examine both internally and externally. -,-,-