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Ensinger PEI

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Covestro Baydur® 726 IBS Polyurethane Structural Foam RIM, Density 45 pcf
Categories: Polymer; Thermoset; Polyurethane, TS; Thermoset Polyurethane Foam, Unreinforced

Material Notes: Characterization: Baydur 726 IBS is a high-density polyurethane structural foam system used in the reaction injection molding (RIM) process.

Properties / Applications: Baydur 726 IBS is a high-density polyurethane structural foam system used in the reaction injection molding (RIM) process. This system incorporates a specially engineered interactive blowing system (IBS) and is supplied as two reactive liquid components. Component A is a modified polymeric diphenylmethane diisocyanate (PMDI) prepolymer blend, and Component B is a formulated polyol system containing no CFC- or HCFC-blowing additives. Baydur 726 IBS system is used in applications requiring a UL94 flammability rating* of V-0 and/or 5VA for use in electronic, equipment housing, and appliance markets. The applications typically take advantage of the material's strength, excellent surface finish, and large-part capability. As with any product, use of the Baydur 726 IBS system in a given application must be tested (including field testing, etc.) in advance by the user to determine suitability.

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Physical PropertiesOriginal ValueComments
Specific Gravity 0.720 g/ccASTM D792
 1.108 g/ccPolyol (Component B)
 1.24 g/ccIsocyanate (Component A)
Viscosity 240 - 395 cPIsocyanate (Component A)
 1000 cPPolyol (Component B)
Linear Mold Shrinkage 0.0070 - 0.0090 cm/cm
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore D 70ASTM D2240
Tensile Strength at Break 22.8 MPaASTM D638
Elongation at Break 8.0 %ASTM D638
Flexural Strength 48.3 MPaASTM D790
Flexural Modulus 1310 MPaASTM D790
Charpy Impact Unnotched 21.0 kJ/m²
 
Thermal PropertiesOriginal ValueComments
Deflection Temperature at 0.46 MPa (66 psi) 93.0 °C
Flammability, UL94 V-0
 5VB
Flash Point 161 °CPolyol (Component B)
 213 °CIsocyanate (Component A)
 
Processing PropertiesOriginal ValueComments
Mold Temperature 66.0 - 76.0 °C
Moisture Content 0.32 - 0.46 %Polyol (Component B)
Gel Time 19.0 - 22.0 minMachine Reactivity
 26.0 - 36.0 minHand Mix Reactivity
 
Descriptive Properties
AppearanceDark brown liquidIsocyanate (Component A)
 Pale amber liquidPolyol (Component B)
Content26.6-27.4%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 go back to viewing the property data in MatWeb's normal format.

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