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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.

This datasheet includes:

  Makrolon® WB1239 | PC | Bayer MaterialScience
Product Texts
  • 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 propertiesValueUnitTest 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 propertiesValueUnitTest 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 propertiesValueUnitTest 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 propertiesValueUnitTest 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 propertiesValueUnitTest 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 propertiesValueUnitTest Standard
Luminous transmittance 87 % ISO 13468-1, -2
Rheological calculation propertiesValueUnitTest 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 productionValueUnitTest 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
Diagrams
Viscosity-shear rate , Makrolon® WB1239, PC, Bayer MatSc
Shearstress-shear rate , Makrolon® WB1239, PC, Bayer MatSc
Dynamic Shear modulus-temperature , Makrolon® WB1239, PC, Bayer MatSc
Stress-strain , Makrolon® WB1239, PC, Bayer MatSc
Secant modulus-strain , Makrolon® WB1239, PC, Bayer MatSc
Specific volume-temperature (pvT) , Makrolon® WB1239, PC, Bayer MatSc
Characteristics
Processing
Injection Molding, Profile Extrusion, Sheet Extrusion, Other Extrusion, Blow Molding
Delivery form
Pellets
Special Characteristics
Transparent
Regional Availability
Other text information
Blow molding

 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.
Disclaimer

Bayer MaterialScience AG

This information and our technical advice - whether verbal, in writing or by way of trials - are given in good faith but without warranty, and this also applies where proprietary rights of third parties are involved. Our advice does not release you from the obligation to check its validity and to test our products as to their suitability for the intended processes and uses. The application, use and processing of our products and the products manufactured by you on the basis of our technical advice are beyond our control and, therefore, entirely your own responsibility. Our products are sold in accordance with our General Conditions of and Delivery. The values stored in the databank should only be used as guidelines for component design. In giving these values neither guarantee, nor assurance of particular material properties can be given.

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