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offers extended functionality!CAMPUS® datasheet | Makrolon® WB1239
This datasheet of Makrolon® WB1239 from Bayer MaterialScience is provided by the international plastics database CAMPUS.
CAMPUS is organized by a group of leading international resin producers, who have agreed to test their material according to uniform conditions, based on ISO standards (ISO 10350, ISO 11403), in order to offer comparable data to the market.
- ISO 7391-PC,B,(,,)-05-9
- Global grade
- MVR (300 °C/1.2 kg) 2.5 cm3/10 min
- Blow molding
- High viscosity
- Branched
- Food contact quality
- Extrusion blow molding
- Injection stretch blow molding
- Available in transparent colors only
- Water bottles
| Rheological properties | Value | Unit | Test Standard |
| Melt volume-flow rate (MVR) | 2.5 | cm³/10min | ISO 1133 |
| Temperature | 300 | °C | ISO 1133 |
| Load | 1.2 | kg | ISO 1133 |
| Molding shrinkage (parallel) | 0.7 | % | ISO 294-4, 2577 |
| Molding shrinkage (normal) | 0.8 | % | ISO 294-4, 2577 |
| Mechanical properties | Value | Unit | Test Standard |
| Tensile Modulus | 2300 | MPa | ISO 527-1/-2 |
| Yield stress | 64 | MPa | ISO 527-1/-2 |
| Yield strain | 6.6 | % | ISO 527-1/-2 |
| Nominal strain at break | >50 | % | ISO 527-1/-2 |
| Charpy impact strength (+23°C) | N | kJ/m² | ISO 179/1eU |
| Charpy impact strength (-30°C) | N | kJ/m² | ISO 179/1eU |
| Puncture - maximum force (+23°C) | 5500 | N | ISO 6603-2 |
| Puncture - maximum force (-30°C) | 6400 | N | ISO 6603-2 |
| Puncture energy (+23°C) | 55 | J | ISO 6603-2 |
| Puncture energy (-30°C) | 60 | J | ISO 6603-2 |
| Thermal properties | Value | Unit | Test Standard |
| Glass transition temperature (10°C/min) | 150 | °C | ISO 11357-1/-2 |
| Temp. of deflection under load (1.80 MPa) | 130 | °C | ISO 75-1/-2 |
| Temp. of deflection under load (0.45 MPa) | 144 | °C | ISO 75-1/-2 |
| Vicat softening temperature (50°C/h 50N) | 150 | °C | ISO 306 |
| Coeff. of linear therm. expansion (parallel) | 70 | E-6/K | ISO 11359-1/-2 |
| Coeff. of linear therm. expansion (normal) | 70 | E-6/K | ISO 11359-1/-2 |
| Electrical properties | Value | Unit | Test Standard |
| Relative permittivity (100Hz) | 3.1 | - | IEC 60250 |
| Relative permittivity (1MHz) | 3 | - | IEC 60250 |
| Dissipation factor (100Hz) | 5 | E-4 | IEC 60250 |
| Dissipation factor (1MHz) | 95 | E-4 | IEC 60250 |
| Volume resistivity | >1E13 | Ohm*m | IEC 60093 |
| Surface resistivity | >1E15 | Ohm | IEC 60093 |
| Electric strength | 32 | kV/mm | IEC 60243-1 |
| Comparative tracking index | 250 | - | IEC 60112 |
| Other properties | Value | Unit | Test Standard |
| Water absorption | 0.3 | % | Sim. to ISO 62 |
| Humidity absorption | 0.12 | % | Sim. to ISO 62 |
| Density | 1200 | kg/m³ | ISO 1183 |
| Material specific properties | Value | Unit | Test Standard |
| Luminous transmittance | 87 | % | ISO 13468-1, -2 |
| Rheological calculation properties | Value | Unit | Test Standard |
| Density of melt | 1020 | kg/m³ | - |
| Thermal conductivity of melt | 0.214 | W/(m K) | - |
| Spec. heat capacity melt | 2100 | J/(kg K) | - |
| Eff. thermal diffusivity | 1E-7 | m²/s | - |
| Ejection temperature | 130 | °C | - |
| Test specimen production | Value | Unit | Test Standard |
| Processing conditions acc. ISO | 7390 | - | ISO ....-2 |
| Injection Molding, melt temperature | 310 | °C | ISO 294 |
| Injection Molding, mold temperature | 90 | °C | ISO 10724 |
| Injection Molding, injection velocity | 200 | mm/s | ISO 294 |
| Injection Molding, pressure at hold | 500 | MPa | ISO 294 |
Preprocessing
| Max. Water content | 0.01 % |
| Drying temperature | 120 °C |
| Drying time | |
| Circulating air drying oven (50 % fresh air) | 4-12 h |
| Fresh air dryer (high speed dryer) | 2-4 h |
| Dry air dryer | 2-3 h |
Process ing
| Melt temperature | 230-260 °C |
Annealing with hot air
Annealing ovens are designed for either batch operation or continuous operation. In discontinuous operation, a batch of Makrolon bottles are placed in the oven and heated to the required annealing temperature of 125 to 130 °C. The time required for annealing will be a function of the bottle wall thickness. Returnable Makrolon bottles that are to be cleaned on conventional bottlecleaning plant are generally annealed for 25 to 30 minutes. In continuous operation, the bottles are carried through the oven on a conveyor and simultaneously annealed. Annealing temperatures and times similar to those for batch operation are recommended. It should be borne in mind that, with this process, excessive annealing times (> 30 min) can lead to a reduction in the mechanical strength of the finished parts. It is thus recommended that a preliminary test be conducted in order to establish the impact of annealing on the serviceability of the parts.Annealing with infrared radiation
By contrast to the conventional form of annealing in a hot-air oven, as describe dabove, where a pure annealing time of some 30 min is required, annealing with the aid of IR radiation is completed in only 60 s or so (at approx. 100 mm from the heater). The heat transfer does not take place through conduction here but through the abso rption of the radiation. When polycarbonate bottles are being annealed with infrared radiation, care must thus be taken to ensure that the surface temperature of the bottle does not exceed 130 °C (danger of deformation). No reduction in mechanical strength is observed with this method on account of the short annealing times. Use is made of both short-wave IR heaters with a maximum wavelength of between 1000 and 2000 nm and medium-wave heaters with a maximum value of between 2000 and 3600 nm. Th e optimum heater for Makrolon is one with a wavelength of approximately 2500 nm.Bayer MaterialScience AG
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