Covestro Baydur® STR/C 675 Polyurethane Structural RIM System

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Covestro Baydur® STR/C 675 Polyurethane Structural RIM System
Categories:	Fluid
Material Notes:	Characterization: Baydur STR/C 675 is a polyurethane medium to high density structural RIM system used in the Long Fiber Injection (LFI) technology. Properties / Applications: The Baydur STR/C 675 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/C 675 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/C 675 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	Original Value	Comments

Specific Gravity	1.04 g/cc	Polyol
	1.15 g/cc	Composite
	1.23 g/cc	Isocyanate
Viscosity	200 cP	Isocyanate
	900 cP	Polyol

Mechanical Properties	Original Value	Comments
Tensile Strength at Break	58.6 MPa
Elongation at Break	1.8 %
Flexural Modulus	5940 MPa

Thermal Properties	Original Value	Comments
CTE, linear	27.0 µin/in-°F

Processing Properties	Original Value	Comments
Mold Temperature	65.5 - 76.7 °C
Gel Time	1.00 - 1.25 min

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PCOVEST0102 / 201885

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