Covestro Bayflex® 257 Polyether-based Polyurethane System

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Covestro Bayflex® 257 Polyether-based Polyurethane System
Categories:	Polymer; Thermoset; Polyurethane, TS
Material Notes:	Characterization: Bayflex 257 is a fully compounded polyether-based polyurethane system consisting of two liquid components which can be water-blown. Properties / Applications: Bayflex 257 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 257 system is used in the outsole system of dual-density polyether shoe soles. Finished outsoles can be molded translucent to opaque. The combination of durability, styling latitude and ease of processing makes the Bayflex 257 system a prime soling material for dual-density soles for casual, walking and light-duty shoes. As with any product, use of the Bayflex 257 system in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability. Information provided by Covestro
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Physical Properties	Metric	English	Comments

Specific Gravity	1.05 g/cc	1.05 g/cc	Polyol (Component B)
	1.05 g/cc	1.05 g/cc	Molded
	1.21 g/cc	1.21 g/cc	Isocyanate (Component A)
Viscosity	550 - 800 cP	550 - 800 cP	Isocyanate (Component A)
	1100 cP	1100 cP	Polyol (Component B)

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	55 - 60	55 - 60	ASTM D2240
Tensile Strength at Break	8.27 - 10.3 MPa	1200 - 1490 psi	ASTM D412
Elongation at Break	500 - 600 %	500 - 600 %	ASTM D412
Tear Strength	35.1 - 43.8 kN/m	200 - 250 pli	Die C; ASTM D1004
Taber Abrasion, mg/1000 Cycles	50 @Load 1.00 kg	50 @Load 2.20 lb	H-18; ASTM D4060

Thermal Properties	Metric	English	Comments
Flash Point	135 °C	275 °F	Polyol (Component B)
	213 °C	415 °F	Isocyanate (Component A)

Processing Properties	Metric	English	Comments
Mold Temperature	49.0 °C	120 °F

Descriptive Properties
Appearance	Light yellow liquid		Polyol (Component B)
	Light yellow to yellow liquid		Isocyanate (Component A)
Content	22.6-23.1%		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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PCOVEST0124 / 201907

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