Covestro Baydur® 684 Polyurethane Structural Foam RIM, Density 20 pcf

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Covestro Baydur® 684 Polyurethane Structural Foam RIM, Density 20 pcf
Categories:	Polymer; Thermoset; Polyurethane, TS; Thermoset Polyurethane Foam, Unreinforced
Material Notes:	Characterization: Baydur 684 is a rigid polyurethane structural foam system used in the reaction injection molding (RIM) process. Properties / Applications: Baydur 684 is a rigid polyurethane structural foam system used in the reaction injection molding (RIM) process. The system is supplied as two reactive liquid components. Component A is a polymeric diphenylmethane diisocyanate (PMDI), and Component B is a formulated polyol system containing no CFC- or HCFC-blowing additives. The Baydur 684 system is used for applications requiring high compression strength foams, filling cavities and/or producing foam cores for overmolding. As with any product, use of the Baydur 684 system in a given application must be tested (including field testing, etc.) in advance by the user to determine suitability. Information provided by Covestro
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Physical Properties	Metric	English	Comments

Specific Gravity	1.08 g/cc	1.08 g/cc	Polyol
	1.24 g/cc	1.24 g/cc	Isocyanate
Viscosity	200 cP	200 cP	Isocyanate
	900 cP	900 cP	Polyol

Mechanical Properties	Metric	English	Comments
Hardness, Shore D	43 @Thickness 12.7 mm	43 @Thickness 0.500 in	ASTM D2240
Tensile Strength at Break	5.86 MPa @Thickness 12.7 mm	850 psi @Thickness 0.500 in	ASTM D638
Flexural Strength	9.13 MPa @Thickness 12.7 mm	1320 psi @Thickness 0.500 in	ASTM D790
Flexural Modulus	0.306 GPa @Thickness 12.7 mm	44.4 ksi @Thickness 0.500 in	ASTM D790
Compressive Strength	6.51 MPa @Thickness 12.7 mm	944 psi @Thickness 0.500 in	ASTM D2240

Processing Properties	Metric	English	Comments
Gel Time	<= 0.917 min	<= 0.917 min

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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PCOVEST0088 / 201871

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