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Home >> Products Specification >> Polystyrol 485 I
Polystyrol 485 I
Product description
Polystyrol 485 I is a high-impact grade of polystyrene for extruded sheets with a matt surface.
Polystyrol 485 I can be injection moulded at temperatures between 180 and 260°C, and recommended mould temperatures between 10-60°C. Extrusion temperatures should not exceed 240°C.
Sheets, semi finished goods, fat resistant food packaging.
Physical form and Storage
Polystyrol 485 I is supplied as cylindrical shaped granules. It has to be kept in its original containers in cool, dry place. Avoid direct exposure to sunlight. Polystyrol 485 I can also be stored in silos.
Food legislation
If used unmodified and under appropriate processing conditions parts from Polystyrol 485 I comply with the usual requirements for food packaging. Detailed written confirmations (e.g. BGVO, FDA) are given on request. Please contact our regional sales office.
Product safety
During processing of Polystyrol 485 I small quantities of styrene monomer may be released into the atmosphere. At styrene vapour concentrations below 20 ppm no negative effects on health are expected. In our experience, the concentration of styrene does not exceed 1 ppm in well ventilated workplaces - that is where five to eight air changes per hour are made.
Further information can be found in our Polystyrol safety data sheets. These can be downloaded from the Plastics Portal,
The data contained in this publication are based on our current knowledge and experience. In view of the many factors that may affect processing and application of our product, these data do not relieve processors from carrying out their own investigations and tests; neither do these data imply any guarantee of certain properties, nor the suitability of the product for a specific purpose. Any descriptions, drawings, photographs, data, proportions, weights etc. given herein may change without prior information and do not constitute the agreed contractual quality of the product. It is the responsibility of the recipient of our products to ensure that any proprietary rights and existing laws and legislation are observed. In order to check the availability of products please contact us or our sales agency.
Typical values at 23°C1)
  Test method 2) Unit Value
Mechanical Properties      
Tensile modulus ISO 527-1/-2 MPa 1650
Yield stress, 50 mm/min ISO 527-1/-2 % 1.6
Yield strain, 50 mm/min ISO 527-1/-2 MPa 23
Nominal strain at break, 50 mm/min ISO 527-1/-2 % 35
Flexural strength ISO 178 MPa 32
Charpy impact strength (23°C) ISO 179/1eU kJ/m² N
Charpy impact strength (-30°C) ISO 179/1eU kJ/m² 140
Charpy notched impact strength (23°C) ISO 179/1eU kJ/m² 12
Charpy notched impact strength (-30°C) ISO 179/1eU kJ/m² 7
Thermal properties      
Vicat softening temperature VST/B/50 ISO 306 °C 87
Melt volume-flow rate MVR 200 °C/5 kg ISO 1133 cm³/10min 4
Processing: Injection moulding (M), Extrusion (E), Blow moulding (B) - - M.E
Melt temperature, injection moulding - °C 180 - 260
Mold temperature, injection molding - °C 10 - 60
Melt temperature, plates - °C 200 - 240
Melt temperature, flat film - °C 200 - 240
Electrical properties      
Relative permittivity (100Hz) IEC 60250   2.5
Relative permittivity (1 MHz) IEC 60250   2.5
Volume resistivity IEC 60093 Ohm*m >1E16
Surface resistivity IEC 60093 Ohm >1E13
Electric strength K20/P50 IEC 60243-1 kV/mm 155
Optical properties      
Surface gloss   Skalenteile 12
UL 94 (d = 1,6 mm) UL-94 class HB
Other properties      
Density ISO 1183 kg/m³ 1029
Water absorption, equilibrium in water at 23°C similar to ISO 62 % <0.1
Moisture absorption, equilibrium 23°C/50% r.h. similar to ISO 62 % <0.1