Covestro Baydur® STR 822 Polyurethane Structural RIM System

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Covestro Baydur® STR 822 Polyurethane Structural RIM System
Categories:	Fluid
Material Notes:	Characterization: Baydur STR 822 is a polyurethane medium to high density structural RIM system used in the Long Fiber Injection (LFI) technology. Properties / Applications: The Baydur STR 822 system is used in an open mold process with varying levels of fiberglass reinforcement depending on the property requirements needed. The system has a long gel time, yet fast cure time, which makes it well suited for large part applications. The Baydur STR 822 system is supplied as two reactive liquid components. Component A is a polymeric diphenlymethane diisocyanate (PMDI), and Component B is a formulated polyether polyol system. As with any product, use of the Baydur STR 822 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	1.12 g/cc	1.12 g/cc	Polyol (Component B)
	1.12 g/cc	1.12 g/cc	Composite
	1.23 g/cc	1.23 g/cc	Isocyanate (Component A)
Viscosity	200 cP	200 cP	Isocyanate (Component A)
	450 cP	450 cP	Polyol (Component B)

Mechanical Properties	Metric	English	Comments
Tensile Strength at Break	58.2 MPa	8440 psi
Elongation at Break	2.1 %	2.1 %
Flexural Modulus	5.74 GPa	833 ksi

Thermal Properties	Metric	English	Comments
CTE, linear	43.2 µm/m-°C	24.0 µin/in-°F
Flash Point	186 °C	367 °F	Polyol (Component B)
	199 °C	390 °F	Isocyanate (Component A)

Processing Properties	Metric	English	Comments
Mold Temperature	74.0 - 85.0 °C	165 - 185 °F
Gel Time	0.9167 min	0.9167 min

Descriptive Properties
Appearance	Black liquid		Polyol (Component B)
	Dark brown liquid		Isocyanate (Component A)
Content	>31%		NCO, Isocyanate (Component A)
Hydroxyl number	[mg KOH/g], Polyol (Component B)

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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PCOVEST0101 / 201884

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