Thermomechanical analysis
Definition/objectives:
Thermomechanical analysis (TMA) is used to characterize the mechanical properties of materials as a function of temperature, and thus verify that the material structure is suitable for the end use.
Performance measurement (standard tests and equipment):
- Tensile, compression or flexure test (ASTM D638, ASTM D 695, ASTM D 790, ISO-527-1 standard, and ISO-178 standard); Impact Notch (ASTM D 256 and ISO-179-1 standard), mass drop test (ISO 6272 standard).
- Thermo-mechanical tests: thermo-gravimetric analysis (TGA), differential scanning calorimetry (DSC), fire test (Limiting Oxygen Index (LOI), Mass loss calorimeter and UL94 testing). Gas permeability (oxygen, nitrogen, CO2)
- Tensile strength/deformation of films/Tensile Young's modulus
- Linear coefficient of thermal expansion
- Deflection temperature of polymers (HDT) (ASTM D 648 and ASTM D1525 )
- Rheological measurements of viscous polymer systems in shear (low and high shear rates) (ASTM D1238 and ISO-1133-1 )
- Penetration and impact measurements
- Measurement of polymer melt flow index (MFI)
- Viscoelastic behavior ; monitoring cross-linking of thermosetting resins or control of finished composite materials.
- Isothermal creep (irreversible deformation of a material measured as a function of time under constant applied load)
- Detection of transitions (glass transition, softening, melting, decomposition, etc.)
- Measurement of heat exchange
- Measurement of density (ASTM D 792 and ISO-1183-1 standard)
- Measurement of material hardness to ASTM D2240 (Shore hardness tester)
- Measurement of Rockwell hardness of plastics to ASTM D785
- Mechanical properties in dynamic mode (DMA)
Our strengths
- The multidisciplinary nature of the proposed techniques for a very complete and fine characterization of materials.