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Covestro Baydur® 726 IBS Polyurethane Structural Foam RIM, Density 50 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 0.800 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 74ASTM D2240
Tensile Strength at Break 31.7 MPaASTM D638
Elongation at Break 8.0 %ASTM D638
Flexural Strength 56.5 MPaASTM D790
Flexural Modulus 1520 MPaASTM D790
Charpy Impact Unnotched 25.2 kJ/m²
 
Thermal PropertiesOriginal ValueComments
Deflection Temperature at 0.46 MPa (66 psi) 96.0 °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)

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PCOVEST0092 / 201875

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