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- MFI gives an indication of the fluidity of the molten polymer. It is an important value for prediction of processing behaviour. For this reason, the this 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. It 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 property gives an indication of the fluidity of the molten polymer. It is an important value for the prediction of processing behaviour. For this reason, this 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. It 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 is the energy needed for brittle fracture of a material. The greater the value, the more resistant the material is to breaking upon impact. It 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__ It denotes the energy needed for the fracture of a material. The greater the value, the more resistant the material is to breaking upon impact. It 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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__%%( color: #003399; font-size: 16px;)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:__ It denotes 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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__%%( color: #003399; font-size: 16px;)Flexural modulus:__ The stiffness of a material in the flexural direction.
__Flexural modulus:__ It denotes the stiffness of a material in the flexural direction.
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__%%( color: #003399; font-size: 16px;)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:__ It 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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__%%( color: #003399; font-size: 16px;)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:__ It is 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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__%%( color: #003399; font-size: 16px;)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:__ It 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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__%%( color: #003399; font-size: 16px;)Vicat softening temperature:__ Denotes the temperature at which the material loses its hardness.
__Vicat softening temperature:__ It denotes the temperature at which the material loses its hardness.
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__%%( color: #003399; font-size: 16px;)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