Mearthane Durethane™ M DM-640A Foam Polyurethane

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Mearthane Durethane™ M DM-640A Foam Polyurethane
Categories:	Polymer; Thermoset; Polyurethane, TS; Thermoset Polyurethane Foam, Unreinforced; Rubber or Thermoset Elastomer (TSE)
Material Notes:	MDI backbone: ester. Shore 00 Hardness: 85 Summary: Durethane M is a flexible, microcellular, open cell and closed cell urethane foam. Because it is mechanically mixed, the cell size is uniform. Durethane M is very economical, and has excellent resistance to compression set. It can be formulated to form an integral skin. Applications: The compression set resistance of Durethane M makes it an effective material for applications with repeated compression cycles, such as actuator pads on postal meters and idler belts. Conductivity: All Durethane elastomers can be formulated to be electrically conductive, for applications involving electrostatic dissipation (ESD). Mearthane's proprietary conductivity process does not comprise the material performance specification of the urethane. Information provided by Mearthane Products Corporation.
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Physical Properties	Metric	English	Comments

Density	0.640 g/cc	0.0231 lb/in³	ASTM D3574A

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	40	40	ASTM D2240
Tensile Strength, Ultimate	68.6 MPa	9950 psi	ASTM D3574E
Elongation at Break	570 %	570 %	ASTM 3457E
100% Modulus	1.17 MPa @Strain 100 %	170 psi @Strain 100 %	ASTM D3574E
200% Modulus	1.90 MPa @Strain 200 %	276 psi @Strain 200 %	ASTM D3574E
300% Modulus	2.79 MPa @Strain 300 %	405 psi @Strain 300 %	ASTM D3574E
Compressive Yield Strength	0.410 MPa	59.5 psi	at 10% deflection; ASTM D3574C
	0.660 MPa	95.7 psi	at 20% deflection; ASTM D3574C
	0.930 MPa	135 psi	at 30% deflection; ASTM D3574C
Resilience	35	35	Bashore Rebound; ASTM 2632D
Tear Strength Test	110	110	lb; Die C; ASTM 3457F

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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