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Rulon Bearings

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.

Information provided by Covestro

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Physical PropertiesMetricEnglishComments
Specific Gravity 0.800 g/cc0.800 g/ccASTM D792
 1.108 g/cc1.108 g/ccPolyol (Component B)
 1.24 g/cc1.24 g/ccIsocyanate (Component A)
Viscosity 240 - 395 cP240 - 395 cPIsocyanate (Component A)
 1000 cP1000 cPPolyol (Component B)
Linear Mold Shrinkage 0.0070 - 0.0090 cm/cm0.0070 - 0.0090 in/in
 
Mechanical PropertiesMetricEnglishComments
Hardness, Shore D 7474ASTM D2240
Tensile Strength at Break 31.7 MPa4600 psiASTM D638
Elongation at Break 8.0 %8.0 %ASTM D638
Flexural Strength 56.5 MPa8190 psiASTM D790
Flexural Modulus 1.52 GPa220 ksiASTM D790
Charpy Impact Unnotched 2.52 J/cm²12.0 ft-lb/in²
 
Thermal PropertiesMetricEnglishComments
Deflection Temperature at 0.46 MPa (66 psi) 96.0 °C205 °F
Flammability, UL94 V-0V-0
 5VB5VB
Flash Point 161 °C322 °FPolyol (Component B)
 213 °C415 °FIsocyanate (Component A)
 
Processing PropertiesMetricEnglishComments
Mold Temperature 66.0 - 76.0 °C151 - 169 °F
Moisture Content 0.32 - 0.46 %0.32 - 0.46 %Polyol (Component B)
Gel Time 19.0 - 22.0 min19.0 - 22.0 minMachine Reactivity
 26.0 - 36.0 min26.0 - 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 view all the property values for this datasheet as they were originally entered into MatWeb.

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PCOVEST0092 / 201875

Master Bond adhesives

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