2.2
ELASTOMER
The elastomer shall be the ethylene propylene dimonomer (EPDM), as
specified in ASTM D 2000, with the following properties:
**************************************************************************
NOTE: Coordinate values with calculated design
requirements.
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ELASTOMER PROPERTY REQUIREMENTS
Minimum Tensile Strength
[14 MPa] [_____]
(ASTM D 412)
Shore Hardness (Durometer)
[70 + 5] [_____]
(ASTM D 412)
Modulus at 400 Percent Elongation
[6.2 MPa]
[_____]
(ASTM D 412)
Maximum Compression Set
[25] [_____] Percent
(ASTM D 395 Method B,
Maximum Percent 22 Hr. at 70 Degrees C
Tear Resistance
[300] [_____] lb/in.
(ASTM D 624; DIE B Min. 150 lb/in)
Minimum Elongation
[500] [_____] Percent
(ASTM D 412)
Ozone Resistance
[80] [_____] H +
(ASTM D 1171 Exposure Method B;
70h Bent Loop at 38 Degrees C; 50pphm)
Low Temperature Impact Resistance
[0] [_____] Degrees C
(ASTM D 746 Procedure B;
Non-Brittle at -55 Degrees C)
Water Absorption
[10.0] [_____] Percent
(ASTM D 471 Method B;
70h at 100 Degrees C.;
Volume Change +5 Percent
Heat Resistance
Shall exceed
(ASTM D 573; 70h at 100 Degrees C
requirements
Ch Tensile, Elong. -25 Percent,
Hardness +10
Compression Deflection Resistance
Shall exceed
(ASTM D 575 Method B;
requirements
3 S Dwell at 23 Degrees C
ELASTOMER PROPERTY REQUIREMENTS
Minimum Tensile Strength
[2000 psi] [_____]
(ASTM D 412)
SECTION 02397
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