| About |
|---|
| Baydur 646 is a rigid polyurethane structural foam system used in the reaction injection molding (RIM) process. The system is supplied as two reactive liquid components: Component A is a polymeric diphenylmethane diisocyanate (PMDI), and Component B is a formulated polyol system containing no CFC- or HCFC-blowing additives. The Baydur 646 system is used to produce foam cores for composite applications, such as water skis, wake boards, snow boards, and various components for the transportation and marine markets. As with any product, use of the Baydur 646 system in a given application must be tested (including field testing, etc.) in advance by the user to determine suitability.&& |
| Product Description | |
|---|---|
| Supplier | Covestro |
| Generic | PUR+MDI |
| Material Status | Commercial: Active |
| Availabilitys | Africa & Middle East ,North America,Latin America,Asia Pacific,Europe |
| Technical Data | |||
|---|---|---|---|
| PHYSICAL | Nominal value | Unit | Test method |
| Density | 0.399 | g/cm³ | ASTM D792 |
| Shrinkage rate | |||
| MD：6.35 mm | 0.30 to 0.50 | % | ASTM D955 |
| IMPACT | Nominal value | Unit | Test method |
|---|---|---|---|
| Charpy Unnotch Impact strength | Internal Method | ||
| — | 7.4 | kJ/m² | Internal Method |
| — | 8.0 | kJ/m² | Internal Method |
| THERMAL | Nominal value | Unit | Test method |
|---|---|---|---|
| Thermosetting components | |||
| Component A | 按重量计算的混合比: 110 | ||
| Component B | 按重量计算的混合比: 100 |
| MECHANICAL | Nominal value | Unit | Test method |
|---|---|---|---|
| Shore hardness | ASTM D2240 | ||
| Shaw D, 6.35 mm | 46 | ASTM D2240 | |
| Shore D, 12.70 mm | 49 | ASTM D2240 | |
| tensile strength | ASTM D638 | ||
| Fracture, 6.35 mm | 8.27 | MPa | ASTM D638 |
| Fracture, 12.70 mm | 7.58 | MPa | ASTM D638 |
| Tensile strain | ASTM D638 | ||
| Fracture, 6.35 mm | 7.0 | % | ASTM D638 |
| Fracture, 12.70 mm | 9.0 | % | ASTM D638 |
| Bending modulus | ASTM D790 | ||
| 6.35 mm | 462 | MPa | ASTM D790 |
| 12.70 mm | 441 | MPa | ASTM D790 |
| bending strength | ASTM D790 | ||
| 6.35 mm | 13.8 | MPa | ASTM D790 |
| 12.70 mm | 16.5 | MPa | ASTM D790 |
| compressive strength | ASTM D695 | ||
| 6.35 mm | 7.93 | MPa | ASTM D695 |
| 12.7 mm | 7.58 | MPa | ASTM D695 |
| Notes |
|---|
| 1. Typical properties: these are not to be construed as specifications. |
| 2. 0.5 |
| 3. 0.25 in |
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