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__MFI:__ This value gives an indication of the fluidity of the molten polymer. The MFI is an important value for prediction of processing behaviour. For this reason, the MFI is one of the main properties used in selection of materials. The MFI could be seen as a measured viscosity at a single temperature and shear rate. The MFI of a material is often measured at a specified temperature and weight. However, due to the fact that the viscosity of polymers is shear-dependent, the MFI could also be measured at multiple weights (shear rates).
__- MFI:__ This value gives an indication of the fluidity of the molten polymer. The MFI is an important value for prediction of processing behaviour. For this reason, the MFI is one of the main properties used in selection of materials. The MFI could be seen as a measured viscosity at a single temperature and shear rate. The MFI of a material is often measured at a specified temperature and weight. However, due to the fact that the viscosity of polymers is shear-dependent, the MFI could also be measured at multiple weights (shear rates).
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__Impact strength:__ The energy needed for brittle fracture of a material. The greater the value, the more resistant the material is to breaking upon impact. Impact strength can be measured via Charpy or Izod methods. Samples could be measured notched or unnotched. Notched values are lower than unnotched values due to the limitation of energy dissipation throughout the sample. Furthermore, the impact strength can be measured at different temperatures to predict impact behavior in different environments.
__- Impact strength:__ The energy needed for brittle fracture of a material. The greater the value, the more resistant the material is to breaking upon impact. Impact strength can be measured via Charpy or Izod methods. Samples could be measured notched or unnotched. Notched values are lower than unnotched values due to the limitation of energy dissipation throughout the sample. Furthermore, the impact strength can be measured at different temperatures to predict impact behavior in different environments.
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__E-modulus:__ The stiffness of a material in the tensile direction. For blown films this value is measured in the machine direction and transverse direction.
__- E-modulus:__ The stiffness of a material in the tensile direction. For blown films this value is measured in the machine direction and transverse direction.
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__Strain at yield:__ Denotes the strain (percentage of elongation) of the material at its maximum elastic point. Deformation lower than this value is elastic, meaning the material can return to its original shape. Deformation greater than this value is plastic, meaning the material is permanently deformed. For blown films this value is measured in the machine direction and transverse direction.
__- Strain at yield:__ Denotes the strain (percentage of elongation) of the material at its maximum elastic point. Deformation lower than this value is elastic, meaning the material can return to its original shape. Deformation greater than this value is plastic, meaning the material is permanently deformed. For blown films this value is measured in the machine direction and transverse direction.
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__Stress at yield:__ The applied stress at yield strain. This value is the maximum stress that can be applied to a material before plastically deforming. For blown films this value is measured in the machine direction and transverse direction.
__- Stress at yield:__ The applied stress at yield strain. This value is the maximum stress that can be applied to a material before plastically deforming. For blown films this value is measured in the machine direction and transverse direction.
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__Strain at break:__ This value denotes the strain (percentage of elongation) of the material at its breaking point. The strain at break gives information about the ductility of a material. For blown films this value is measured in the machine direction and transverse direction.
__- Strain at break:__ This value denotes the strain (percentage of elongation) of the material at its breaking point. The strain at break gives information about the ductility of a material. For blown films this value is measured in the machine direction and transverse direction.
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__Vicat softening temperature:__ Denotes the temperature at which the material loses its hardness.
__- Vicat softening temperature:__ Denotes the temperature at which the material loses its hardness.
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__Heat deflection temperature:__ It is a measure of a polymer's resistance to alteration under a given load at an elevated temperature.
__- Heat deflection temperature:__ It is a measure of a polymer's resistance to alteration under a given load at an elevated temperature.
This page (revision-285) was last changed on 14-Sep-2022 10:00 by LeonidTop