Mechanical / Rheological Tests

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MECHANICAL/RHELOGICAL TESTS

Mechanical tests

These tests allow obtaining essential information regarding the mechanical resistance of the compound. The impact strength test allows a quick estimation of the mechanics for quick checks and evaluating the resilience, even at temperatures below zero; the dynamometric tests in traction and flexion allow obtaining the elastic modulus, the loads and the expansions on yielding and fracture in a temperature range up to 150°C. Such information can then be used for the finite element simulations of the mechanical resistance of the piece being tested.

RDA is used for dynamic tests. Dynamic-mechanical tests are carried out with this instrument, stressing solid specimens in frequency by applying a torsional stress. Extremely useful for studying the behaviour of new materials, this instrument allows determining the glass transition temperature, potential secondary transitions and the melting temperature; thanks to the huge potentialities of this instrument, crucial for research, more complex tests can also be conducted to reproduce specific operating conditions, determine the linear thermal expansion coefficients and to construct "master curves" to simulate the material behaviour in frequency ranges not obtainable experimentally.

• Izod Impact Test (Notched And Not Notched)
• Charpy Impact Test (Notched And Not Notched)
• Tensile Impact
• Shore Hardness A/D
• Rockwell Hardness M/R
• DIN Hardness
• Tensile Strength
• Flexural Strength
• Compression Strength
• RDA - Dynamic Mechanical Tests

Rheological Tests

Rheological tests allow determining the behaviour of molten materials. The evaluation of the rheological properties can be carried out through fast empirical methods, such as the Melt Flow Index and the spiral mold, or through more sophisticated and complex techniques that are able to provide intrinsic viscosity data, such as the capillary rheometer.

Together with the spiral mold method, the Melt Flow Index allows obtaining almost immediate empirical data regarding the degree of flowability of a molten material. Even though the instrument does not provide objective viscosity data but only accurate values depending on testing conditions, with reference to regulated tests, it allows obtaining useful information for the classification of raw materials, to make rapid comparisons and to reveal any degradation of the compound, whereas the capillary rheometer is able to provide viscosity curves in function of the various shear rates, up to extremely high values.

This data is fundamental to carrying out a correct Moldflow simulation of the moulding phase, to fine-tune life profiles for the extrusion process and to estimate the efficiency, from a rhelogical point of view, of the various formulations.

• Solution Viscosity
• MFI-MVI - Melt Density
• Capillary Rheometer

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