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Covestro Bayflex® 956 Polyether-based Polyurethane System, Density 34 pcf
Categories: Polymer; Thermoset; Polyurethane, TS

Material Notes: Characterization: Bayflex 956 is a fully compounded, water-blown, polyether-based polyurethane system consisting of two liquid components..

Properties / Applications: Bayflex 956 is a fully compounded polyether-based polyurethane system consisting of two liquid components which can be water-blown. Component A is a modified diphenylmethane diisocyanate (MDI) prepolymer, and Component B is a polyether polyol system. The Bayflex 956 system is used in the manufacture of microcellular polyurethane shoe soles. Soles prepared from these components combine light weight, comfort, and durability. Processibility and dynamic flexural properties are excellent over a wide range of densities. The combination of excellent physical properties and ease of processing has made the Bayflex 956 system a prime soling material for fashion and casual shoes. As with any product, use of the Bayflex 956 system in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability.

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Physical PropertiesOriginal ValueComments
Specific Gravity 0.480 - 0.540 g/ccMolded
 1.06 g/ccPolyol (Component B)
 1.20 g/ccIsocyanate (Component A)
Viscosity 1100 cPIsocyanate (Component A)
 1000 - 1500 cPPolyol (Component B)
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore A 51 - 58ASTM D2240
Tensile Strength at Break 3.45 - 4.14 MPaASTM D412
Elongation at Break 350 - 450 %ASTM D412
Tear Strength 19.0 - 25.0 pliBlack
 90.0 - 110 pliDie C; ASTM D1004
 
Thermal PropertiesOriginal ValueComments
Flash Point 126 °CPolyol (Component B)
 207 °CIsocyanate (Component A)
 
Processing PropertiesOriginal ValueComments
Mold Temperature 43.0 - 51.0 °C
Moisture Content 0.38 - 0.44 %Polyol (Component B)
 
Descriptive Properties
Content18.7-19.1%NCO, Isocyanate (Component A)
Hydroxyl number[mg KOH/g], Polyol (Component B)

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PCOVEST0130 / 201913

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