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Home >> Products Specification >> Polystyrol 495 F
Polystyrol 495 F
Product description
Polystyrol 495 F is a high flow, high impact polystyrene with a good heat resistance and a high stiffness.
Polystyrol 495 F can be injection moulded under different conditions depending on machinery available and articles moulded. Mass temperature can be as high as 260°C. Polystyrol 495 F is suitable for gas assisted injection moulding.
Consumer electronics: TV-front and back; chassis für VCR and CD player. Household: internal parts of vacuum cleaners; refrigerator parts; drawers; audio- and video cassettes; printer housings, keyboards, computers, copier parts.
Physical form and Storage
Polystyrol 495 F 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 495 F can also be stored in silos.
Food legislation
If used unmodified and under appropriate processing conditions parts from Polystyrol 495 F 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 495 F 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 Values3)
Mechanical Properties      
Tensile modulus ISO 527-1/-2| ASTM D 638

MPa 2000 | 2000
Yield stress, 50 mm/min ISO 527-1/-2| ASTM D 638

MPa 26 | 27
Yield strain, 50 mm/min ISO 527-1/-2 % 1.5
Nominal strain at break, 50 mm/min ISO 527-1/-2| ASTM D 638

% 40 | 40
Flexural modulus ISO 178| ASTM D 790 MPa 2100 | 2000
Flexural strength ISO 178 | ASTM D 790 MPa 40 | 35
Charpy impact strength (23°C) ISO 179/1eU kJ/m² N
Charpy impact strength (-30°C) ISO 179/1eU kJ/m² 130
Charpy notched impact strength (23°C) ISO 179/1eA kJ/m² 17
Izod notched impact strength (23°C) ASTM D 256 J/m² 180
Ball indentation hardness at 358 N/30 s ISO 2039-1 MPa 74
Thermal properties      
Vicat softening temperature VST/B/50 ISO 306 °C 88.5
Vicat softening temperature VST/A/120 ISO 306 °C 98
HDT A (1.80 MPa) ISO 75-1/-2 °C 85
HDT B (0.45 MPa) ISO 75-1/-2 °C 89
Melt volume-flow rate MVR 200 °C/5 kg ISO 1133 cm³/10min 9.5
Processing: Injection moulding (M), Extrusion (E), Blow moulding (B) -   M
Melt temperature, injection moulding - °C 180 - 260
Mold temperature, injection molding - °C 10 - 60
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 45
UL 94 (d = 1,6 mm) UL-94 class HB
UL 94 (d = 3 mm) UL-94 class HB
IEC 65 (d = 2,4 mm) - - +
Other properties      
Density ISO 1183 kg/m³ 1028
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