1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Para No. Revisions1981 07 31 Metricated & Retyped CEL2-892203-C61972 03 17 Released AS2-307Page 1 of 2GASKET, POLYETHYLENE FOAM-CLOSED CELL ESA-M8G53-A1. SCOPE:The material defined by this specification is a closed cell, expan
2、dedpolyethylene foam gasket.2. APPLICATION:This specification was released originally for material used forautomotive heater gaskets.3. REQUIREMENTS:3.1 COLOR Natural, or as specified onengineering drawings.3.2 CELL COUNT, min 15/Linear in(59/Linear 100 mm)3.3 LOAD DEFLECTION 3.0 - 10.0 psi (21 - 69
3、 kPa)(ASTM D 1056, 25% deflection at2.0 in (51 mm)/min. Sample 1.0 x1.0 in (25 x 25 mm), determinethickness under 1.0 lb (4.4 N) preload)3.4 TENSILE STRENGTH, min 18 psi (124 kPa)(ASTM D 1564)3.5 ULTIMATE ELONGATION, min 25%(ASTM D 1564)3.6 TEAR RESISTANCE, min 6.0 lb/in (1.1 kN/m)(ASTM D 624, Die “
4、C“)3.7 DIMENSIONAL STABILITYLinear Dimensional Expansion, max 2%(Dry Heat, 8 h at 82 +/- 1 C)Specimen size should be as large as sample part permits but shouldnot exceed 12 x 12 in (300 x 300 mm) x part thickness.3.8 THERMAL CONDUCTANCE, “K“ FACTOR, max 0.39(ASTM C 236, using a 1 x 8 x 8 in(25 x 200
5、 x 200 mm) sample)ENGINEERING MATERIAL SPECIFICATION ESA-M8G53-APage 2 of 23.9 SOLVENT RESISTANCE No surface tackiness or evidenceof foam deterioration.Test Method: Immerse specimens of the foam in approved fabric andupholstery cleaners for a period of 1 h each at 23 +/- 3 C. M-14J147, Petroleum Lig
6、ht Naphtha. ESF-M8B12-A, Denatured Alcohol. ESF-M5B99-A, Trichloroethylene. 50/50 Soap Solution, ESB-M1B9-A/Tap Water3.10 LOW TEMPERATURE FLEXIBILITY AT -29 C No crackingTest Method: Condition sample or production part for 16 h at-29 C and flex 180 over 1 in (25 mm) mandrel. Specimen size,6 in (150
7、mm) x width of part up to 1 in (25 mm) x part thicknessup to 1 in (25 mm).3.11 WATER ABSORPTION-STATIC, max 70%(ASTM D 570, 24 h immersion)3.12 FLAMMABILITY, max 4 in (101 mm)/min(FLTM BN 24-2, without the lot sampling plan)3.13 SUPPLIERS RESPONSIBILITYMaterial supplied to this specification must be
8、 equivalent to thatoriginally approved. Changes in formulation or processing shallnot be made without prior approval as described in SupplierProcedure I-A.4. APPROVAL OF SUPPLIERS:Suppliers to this specification must be approved by the affected productengineering office. Procedure for gaining approv
9、al of a specificmaterial to a new/existing ES-M specification is contained in SupplierProcedure I-A. Approved new suppliers will be added to the EngineeringMaterials Approved Source List.5. GENERAL INFORMATION:This data is for information only and is not a requirement.5.1 DENSITY 1.76 - 2.64 lb/ ft 3(ASTM D 1564) (28 - 42 kg/m 3 )5.2 WATER ABSORPTION, by volume 0.5%(ASTM C 272)
