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Bayflex® 257
| Category: | PUR-MDI , Polyurethane (MDI) |
| Manufacturer: | Covestro - PUR |
| Trademark: | Bayflex® |
| Fillers: | - |
| Ports: | Qinzhou, Shekou, Shanghai, Ningbo |
| Delivery Terms | FOB, CIF, DAP, DAT, DDP |
| PDF: | VXGYay_Bayflex-257.pdf  |
| PRICE: | Order Products email sales@su-jiao.com |
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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. |
| General Information | |
|---|---|
| Forms |
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| Physical | Nominal Value | Unit | Test Method |
|---|---|---|---|
| Specific Gravity | 1.05 | g/cm³ | Internal method |
| Hardness | Nominal Value | Unit | Test Method |
|---|---|---|---|
| Durometer Hardness (Shore A) | 55 - 60 | ASTM D2240 |
| Mechanical | Nominal Value | Unit | Test Method |
|---|---|---|---|
| Taber Abrasion Resistance (1000 Cycles, 1000 g, H-18 Wheel) | 50.0 | mg | ASTM D1044 |
| Ross Flex - 0% Cut Growth | ASTM D1052 | ||
| -29°C, 6.35 mm | > 5.0E+4 | Cycles | ASTM D1052 |
| 23°C, 6.35 mm | > 1.0E+5 | Cycles | ASTM D1052 |
| Additional Information | Nominal Value | Unit | Test Method |
|---|---|---|---|
| Oil Resistance - Volume Swell | % | ASTM D5694 |
| Elastomers | Nominal Value | Unit | Test Method |
|---|---|---|---|
| Tensile Strength (Break) | 8.27 - 10.3 | MPa | ASTM D412 |
| Tensile Elongation (Break) | 500 - 600 | % | ASTM D412 |
| Tear Strength 1 | 35.0 - 43.8 | kN/m | ASTM D1004 |
| Thermoset | Nominal Value | Unit | Test Method |
|---|---|---|---|
| Thermoset Components 2 | |||
| Component a | Mixing ratio by weight: 31 | ||
| Component B | Mixing ratio by weight: 100 |
| Additional Information | Nominal Value | Unit | Test Method |
|---|---|---|---|
| Part A Type: Isocyanate Appearance: Light yellow to yellow liquid Specific Gravity @ 25°C: 1.21 Viscosity @25°C: 550 to 800 mPa Flash Point, PMCC: 213°C NCO: 22.6 to 23.1 wt% Bulk Density at 25°C: 10.1 lb/gal Part B Type: Polyol Appearance: Light yellow liquid Specific Gravity @ 25°C: 1.05 Viscosity @25°C: 1100 mPa-s Flash Point, PMCC: 135°C Bulk Density at 25°C: 8.76 lb/gal Water: 0.10 wt% max Hydroxyl Number: 92 Material Temperatures: 25°CMold Temperature: 49°CDemold Time: 2 minLinear Shrinkage at 0.50 g/cm³: <0.5%Hand Mix Reactivity at 25°C Cream Time: 16 to 20 sec Tack-Free Time: 31 to 51 sec Pull Time: 60 to 70 sec Free-Rise Density: 42 to 46 lb/ft³ |
| Note Message | |
|---|---|
| 1 . | C mould |
| 2 . | 98 Index |
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| MARPOL® LL4F 802-G | Marco Polo International, Inc. | LLDPE | MARPOL® |
| Microthene® F FN50100 | LyondellBasell Industries | LDPE | Microthene® F |
| Spectrum S630 | Spartech Plastics | MDPE | Spectrum |
| 4TECH® 9G22150 H | 4Plas | PPA | 4TECH® |
| Plexiglas® Resist zk6HC | Evonik Industries AG | Acrylic (PMMA) | Plexiglas® |
