1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2009 07 28 N-STATUS No Replacement Named Y. Bankowski, NA 1979 01 10 Metricated and Retyped CAH2 823385 1978 11 30 Released AS2-457 Page 1 of 3 POLYURETHANE, CAST - 52 DUROMETER “D“ HARDNESS ESA-M4D182-A NOT
2、 TO BE USED FOR NEW DESIGN 1. SCOPE: The material defined by this specification is a medium tensile strength, 52 durometer polyurethane. 2. APPLICATION: This specification was released originally for material used for seals and vibration insulators for chassis applications. 3. REQUIREMENTS: 3.1 ORIG
3、INAL PROPERTIES (slab stock) 3.1.1 Tensile Strength, min 4800 psi (33.1 MPa) (ASTM D 412, 2 in (50 mm)/min rate) 3.1.2 Elongation, min 400% (ASTM D 412, 2 in (50 mm)/min rate) 3.1.3 Tensile Set - 50% Elongation, max 10% (ASTM D 412, 2 in (50 mm)/min rate, except hold elongation for 3 min, release; t
4、hen measure set after 3 min rest.) 3.1.4 Hardness - Durometer “D“ 49 - 55 (ASTM D 2240) 3.1.5 Tensile Stress, min (ASTM D 412, 2 in (50 mm)/min rate) At 100% Elongation 1400 psi (9.6 MPa) At 300% Elongation 3000 psi (20.7 MPa) 3.1.6 Tear Strength, min 500 lb/in (88 kN/m) (ASTM D 624, Die “C“) 3.2 PR
5、OPERTIES AFTER AGING (ASTM D 573, 70 h at 102 +/- 3 C) 3.2.1 Tensile Strength, decrease, max 10% 3.2.2 Elongation, decrease, max 7.5% ENGINEERING MATERIAL SPECIFICATION ESA-M4D182-A Page 2 of 3 3.2.3 Hardness - Durometer “D“, change +/- 3 3.2.4 Tensile Set - 50% Elongation, max 8.5% 3.3 PROPERTIES A
6、FTER LIQUID IMMERSION (ASTM D 471, 70 h at 102 +/- 3 C, ASTM No. 1 oil) 3.3.1 Tensile Strength, decrease, max 15% 3.3.2 Elongation, decrease, max 10% 3.3.3 Hardness - Durometer “D“, change +/- 4 3.3.4 Volume Change +/- 5% 3.4 PROPERTIES AFTER LIQUID IMMERSION (ASTM D 471, 70 h at 102 +/- 3 C, ASTM N
7、o. 3 oil) 3.4.1 Tensile Strength, decrease, max 15% 3.4.2 Elongation, decrease, max 10% 3.4.3 Hardness - Durometer “D“, change +/- 5 3.4.4 Volume Change +/- 10% 3.5 OZONE RATING 0 (FLTM BP 1-1) 3.6 COMPRESSION SET, max 15% (ASTM D 395, Method “A“, 1500 lb (6.7 kN) load, 22 h at 70 +/- 1 C) 3.7 COLD
8、TEST AT -40 C No cracks (FLTM BP 6-3, 5 h immersion) Condition following samples prior to testing: Original (as received) After oven aging per para. 3.2 After ASTM No. 3 oil aging per para. 3.4 3.8 SUPPLIERS RESPONSIBILITY Material supplied to this specification must be equivalent to that originally
9、 approved. Changes in formulation or processing shall not be made without prior approval as described in Supplier Procedure I-A. ENGINEERING MATERIAL SPECIFICATION ESA-M4D182-A Page 3 of 3 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.
