| About |
|---|
| High Rigidity Application Casings of Pump and Pivot Bearings&& |
| Product Description | |
|---|---|
| Supplier | LG Chemical |
| Generic | Copolymer Polyformaldehyde |
| Material Status | Commercial: Active |
| Features | Good Rigidity,High elastic,HB |
| Availabilitys | North America,Latin America,Asia Pacific,Europe |
| Process Methods | Injection Molding |
| Technical Data | |||
|---|---|---|---|
| PHYSICAL | Nominal value | Unit | Test method |
| Density | 1.72 | g/cm³ | ASTM D792 |
| Shrinkage rate | ASTM D955 | ||
| MD | 0.30 to 0.70 | % | ASTM D955 |
| TD | 0.30 | % | ASTM D955 |
| IMPACT | Nominal value | Unit | Test method |
|---|---|---|---|
| Impact strength of cantilever beam notch | |||
| 23℃ | 120 | J/m | ASTM D256 |
| THERMAL | Nominal value | Unit | Test method |
|---|---|---|---|
| Hot deformation temperature | ASTM D648 | ||
| 0.45 MPa, annealed, 6.35 mm | 165 | ℃ | ASTM D648 |
| 1.8 MPa, annealed, 6.35 mm | 165 | ℃ | ASTM D648 |
| Melting temperature | 165 | ℃ | |
| Linear coefficient of thermal expansion | |||
| MD：20~80℃ | 3.0E-5 | 1/℃ | ASTM D696 |
| Electrical performance | Nominal value | Unit | Test method |
|---|---|---|---|
| Surface resistivity | 1.0E+14 | ohms | ASTM D257 |
| Volume resistivity | 1.0E+16 | ohms·cm | ASTM D257 |
| Dielectric strength | 25 | kV/mm | ASTM D149 |
| Arc resistance | 135 | sec | ASTM D495 |
| FLAME CHARACTERISTICS | Nominal value | Unit | Test method |
|---|---|---|---|
| 0.73 mm | HB | UL 94 |
| MECHANICAL | Nominal value | Unit | Test method |
|---|---|---|---|
| Rockwell hardness | |||
| R-level | 87 | ASTM D785 | |
| tensile strength | |||
| yield | 148 | MPa | ASTM D638 |
| Tensile strain | |||
| Fracture, 23 ℃ | 3.0 | % | ASTM D638 |
| Bending modulus | |||
| 23℃ | 11800 | MPa | ASTM D790 |
| bending strength | |||
| yield | 276 | MPa | ASTM D790 |
| Taber abraser | |||
| 1000 cycles, 1000 g, CS-17 wheels | 46.0 | mg | ASTM D1044 |
| Process Conditions | |||
|---|---|---|---|
| injection | Nominal value | Unit | Test method |
| Drying temperature | 90 to 110 | °C | |
| Drying time | 3.0 to 6.0 | hr | |
| Barrel rear temperature | 170 to 190 | °C | |
| Barrel middle temperature | 190 to 210 | °C | |
| Barrel front temperature | 200 to 220 | °C | |
| Nozzle temperature | 200 to 220 | °C | |
| Melt temperature (target) | 210 | °C | |
| Mold temperature | 60 to 100 | °C | |
| Injection pressure | 68.6 to 118 | MPa | |
| Hold pressure | 39.2 to 83.4 | MPa | |
| Back pressure | 0.00 to 3.92 | MPa | |
| Screw speed | 40 to 75 | rpm | |
| Notes |
|---|
| 1. Typical properties: these are not to be construed as specifications. |
| 2. 0.20 in/min |
| 3. 0.051 in/min |
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