| About |
|---|
| VA-255 is a rigid polyurethane formulated for hand-batch and vacuum cast methods. Excellent physical properties can be obtained with a room temperature cure without the utilization of mercury, MOCA, or TDI. VA-255 has excellent green strength for good demold characteristics.&& |
| Product Description | |
|---|---|
| Generic | TSU |
| Material Status | Commercial: Active |
| Features | Good Rigidity,Good Green Strength,Good stripping performance,Durability |
| Availabilitys | North America |
| Technical Data | |||
|---|---|---|---|
| PHYSICAL | Nominal value | Unit | Test method |
| Density | |||
| Hardener | 1.11 | g/cm³ | |
| Curing treatment | 1.14 | g/cm³ | |
| Matrix resin | 1.25 | g/cm³ | |
| Shrinkage rate | |||
| MD | 0.20 to 0.60 | % | ASTM D2566 |
| MECHANICAL | Nominal value | Unit | Test method |
|---|---|---|---|
| Bending modulus | 2760 | MPa | ASTM D790 |
| bending strength | 114 | MPa | ASTM D790 |
| IMPACT | Nominal value | Unit | Test method |
|---|---|---|---|
| Impact strength of cantilever beam notch | 53 | J/m | ASTM D256 |
| Uncured Properties | Nominal value | Unit | Test method |
|---|---|---|---|
| viscosity | |||
| 25℃ | 0.20 | Pa·s | |
| 25℃ | 0.35 | Pa·s | |
| 25℃ | 1.0 | Pa·s | |
| Curing time | 28 | hr | |
| Gelation time | 8.0 to 12 | min |
| Cured Properties | Nominal value | Unit | Test method |
|---|---|---|---|
| Shore hardness | |||
| Shaw’s D | 75 to 85 | ASTM D2240 | |
| Tensile modulus | 1930 | MPa | ASTM D638 |
| tensile strength | 68.9 | MPa | ASTM D638 |
| Tensile strain | |||
| fracture | 8.0 | % | ASTM D638 |
| THERMAL | Nominal value | Unit | Test method |
|---|---|---|---|
| Hot deformation temperature | ASTM D648 | ||
| 0.45 MPa, unannealed | 90.0 | ℃ | ASTM D648 |
| 1.8 MPa, unannealed | 82.0 | ℃ | ASTM D648 |
| Thermosetting components | |||
| resin | 按重量计算的混合比: 100 按容量计算的混合比: 100 | ||
| Hardening method | 按重量计算的混合比: 55 按容量计算的混合比: 62 | ||
| stripping time | 120 to 240 | min |
| Notes |
|---|
| 1. Typical properties: these are not to be construed as specifications. |
| 2. Resin |
| 3. Mixed |
| 4. Hardener |
| 5. 24 hours at 77°F + 4 hours at 150°F |
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