Parker Chomerics SOFT-SHIELD® 4008 Low Closure Force, Foam Core EMI Gasket

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Parker Chomerics SOFT-SHIELD® 4008 Low Closure Force, Foam Core EMI Gasket
Categories:	Polymer; Thermoset; Polyurethane, TS; Thermoset Polyurethane Foam, Unreinforced
Material Notes:	Description: Chomerics’ SOFT-SHIELD 4000 Series materials are low-cost, low closure force EMI gaskets that provide effective shielding and grounding of commercial electronic devices, indoor enclosures and industrial equipment. Their availability in thin cross sections makes them an ideal choice for access panel, back plane or I/O connector panel shielding. Rectangular in cross section, the 4000 Series materials are constructed of a closed cell urethane foam that is machine wrapped with a fabric-reinforced aluminum foil. This combination provides the shielding performance of foil and the conformability and toughness of fabric. Each material includes conductive, pressure-sensitive adhesive on one side, which provides a means of gasket attachment without compromising shielding performance. The fabric-reinforced foil covering has no loose conductive fibers or sharp edges. Low compression set, low surface resistivities, and durability make 4000 Series gasketing an excellent EMI shielding solution. Information provided by Chomerics
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Mechanical Properties	Original Value	Comments

Peel Strength	0.438 kN/m	To Aluminum, Ambient Temperature; ASTM D1000
	0.438 kN/m	To Steel, Ambient Temperature; ASTM D1000
	0.525 kN/m @Treatment Temp. 177 °C, Time 173000 sec	To Steel; ASTM D1000
	0.5425 kN/m @Treatment Temp. 177 °C, Time 173000 sec	To Aluminum; ASTM D1000
	0.6825 kN/m @Treatment Temp. 177 °C, Time 3600 sec	To Steel; ASTM D1000
	0.700 kN/m @Treatment Temp. 177 °C, Time 3600 sec	To Aluminum; ASTM D1000
	0.700 kN/m @Treatment Temp. 74.0 °C, Time 173000 sec	95% RH, To Steel; ASTM D1000
	0.7175 kN/m @Treatment Temp. 74.0 °C, Time 173000 sec	95% RH, To Aluminum; ASTM D1000
	0.875 kN/m @Treatment Temp. 204 °C, Time 3600 sec	To Steel; ASTM D1000
	0.8925 kN/m @Treatment Temp. 204 °C, Time 3600 sec	To Aluminum; ASTM D1000
Compression Set	<= 20 %	25% Deflection; ASTM D395 Method B

Electrical Properties	Original Value	Comments
Surface Resistivity per Square	0.0070 ohm @Temperature 121 °C, Time 605000 sec	Initial; CHO-TM-TP57
	0.0070 ohm @Temperature 35.0 °C, Time 605000 sec	95% RH, Initial; CHO-TM-TP57
	0.0090 ohm @Temperature 85.0 °C, Time 605000 sec	Initial; CHO-TM-TP57
	0.010 ohm @Temperature 35.0 °C, Time 605000 sec	95% RH, Final; CHO-TM-TP57
	0.010 ohm @Temperature 70.0 °C, Time 7.88e+6 sec	Initial; CHO-TM-TP57
	0.010 ohm @Temperature 70.0 °C, Time 7.88e+6 sec	Final; CHO-TM-TP57
	0.014 ohm @Temperature 85.0 °C, Time 605000 sec	Final; CHO-TM-TP57
	0.017 ohm @Temperature 121 °C, Time 605000 sec	Final; CHO-TM-TP57
Shielding Effectiveness	80 dB @Frequency 1e+10 Hz	CHO-TM-TP08
	90 dB @Frequency 1e+8 Hz	CHO-TM-TP08
	93 dB @Frequency 1e+9 Hz	CHO-TM-TP08

Thermal Properties	Original Value	Comments
Maximum Service Temperature, Air	70.0 °C
Flammability, UL94	V-0

Descriptive Properties
Adhesion	>2.5 lb/in	Initial PSA, ASTM D1000
Compression Cycling	10000 cycles at 50% Deflection, Final
	10000 cycles at 50% Deflection, Initial
Compression-Deflection, 25% deflection	<3 to <8 psi	ASTM D3574 Modified
Core	PORON Urethane Foam
Jacket	Fabric-Reinforced Aluminum Foil
PSA Type	Chomerics Electrically Conductive Acrylic

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