Thermal properties
Thermal property analysis encompasses the tests used to determine how a material responds to temperature: how it conducts heat, how much it expands, the temperature at which it undergoes phase transitions and the point at which it begins to degrade. Virtually all material properties (mechanical, electrical, optical and dimensional) depend on temperature, making the characterisation of thermal behaviour a critical step in any industrial design or validation decision.
This service combines techniques such as differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dilatometry and thermal conductivity and diffusivity measurement to quantify variables such as conductivity, specific heat capacity, coefficient of expansion and thermal stability. As an external technical partner, INFINITIA does more than take measurements: it interprets the results and translates them into engineering criteria that can be applied to the actual product.
In demanding industrial environments, where a component may go from −40 °C to more than 150 °C in service, understanding its thermal behaviour prevents failures caused by differential expansion, delamination or loss of properties. These tests fit naturally into a broader material characterisation process geared towards technical decision-making.
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What are the thermal properties of a material?
What is it?
Thermal properties are the quantities that describe how a material responds when heat is applied or changes. They determine how thermal energy is transferred through the material, how its dimensions change with temperature, and the threshold at which phase transitions or degradation occur. Understanding them makes it possible to predict how a component will behave across its actual operating range before it reaches the market.
Among the most important thermal properties in engineering are thermal conductivity, heat capacity (or specific heat), thermal diffusivity, thermal expansion, melting point and thermal stability. These properties are related via known physical quantities (thermal diffusivity, for example, is the ratio of thermal conductivity to volumetric heat capacity) and their measurement is governed by standards such as ISO 11357 (DSC), ISO 22007 (thermal conductivity), ASTM E1461 (laser flash method) or ASTM E831 (thermal expansion).
The technical approach covers both heat transfer and phase changes. First-order transitions such as melting and boiling, the glass transition temperature (Tg) in polymers, oxidation and mass loss due to decomposition are studied. To this end, complementary techniques such as DSC, thermogravimetric analysis (TGA), dilatometry and dynamic mechanical analysis are applied, selected according to the material and the variable of interest.
As an industrial technical consultancy, INFINITIA offers distinctive value: it does not merely provide a numerical figure, but interprets it in terms of design, manufacturing and reliability. Thermal characterisation thus becomes a decision-making tool, rather than simply a test certificate.
Analysis of thermal properties in INFINITIA. From testing to engineering decisions
The technical value of the service lies in the industrial interpretation of the measurement. INFINITIA approaches each thermal characterisation as an external technical partner: it identifies which properties are critical for the application, selects the appropriate technique and correlates the result with the expected behaviour of the component in service, rather than treating it as an isolated piece of data.
The specialist team employs complementary techniques (DSC for phase transitions and specific heat, TGA for stability and decomposition, dilatometry for thermal expansion, and methods for measuring thermal conductivity and diffusivity) and combines these with microstructural analysis when the thermal phenomenon is rooted in the material’s internal structure. This approach ties in naturally with the analysis of heat treatments of metals, where the thermal response and microstructure are directly linked.
The complementarity between testing, interpretation and decision-making lies at the heart of the method. A conductivity value or a DSC curve only becomes meaningful when it is related to the geometry of the component, its conditions of use and the material’s other properties. Real-world examples of this approach are documented in the work carried out by INFINITIA.
INFINITIA’s unique approach combines analytical rigour with industrial insight: the metrological precision of the testing is harnessed to provide clear and practical technical recommendations. This approach enables R&D, quality and engineering teams to make informed decisions regarding materials and components subjected to thermal stresses.
Benefits of thermal analysis for product reliability
BENEFITS
Thermal property analysis reduces the risk of dimensional failure caused by differential expansion. Knowing the coefficient of expansion of each material in an assembly makes it possible to anticipate internal stresses, clearances or seizure when the assembly operates outside ambient temperature, a decisive factor in metal-polymer joints and precision components.
Thermal characterisation facilitates the selection and validation of materials against specific service requirements. Determining thermal conductivity, stability or softening temperature provides objective criteria for comparing alternatives, approving suppliers or justifying a change of material without compromising performance or safety.
These tests make it possible to identify the cause of a failure in service when the cause is thermal in nature. Temperature-induced degradation, thermal cycling fatigue or the loss of properties following prolonged exposure to heat leave measurable traces. Integration with failure analysis transforms the thermal data into an actionable diagnosis of the affected component.
Finally, thermal characterisation optimises the product’s cost and energy efficiency. Tailoring the material to actual thermal conditions prevents oversizing, reduces production wastage and improves the component’s performance throughout its service life, with a direct impact on reliability and competitiveness.
Applications of thermal property analysis in design and validation
Applications
The applications of thermal property analysis cut across the entire industrial value chain: they play a part in material selection, design validation, supplier approval and fault diagnosis. Any product operating within a variable or demanding temperature range is a candidate for thermal characterisation to predict its actual behaviour.
INFINITIA approaches these applications from a technical perspective: each test is selected on the basis of the critical variable for the component and translated into an engineering criterion. The six most representative applications of the service are outlined below.
- Measurement of thermal conductivity and diffusivity
- Thermal expansion and coefficient of thermal expansion (CTE)
- Thermal transitions and glass transition temperature (DSC)
- Thermal stability and degradation (TGA)
- Thermal cycling and thermal shock
- Behaviour during melting, softening and heat resistance
Sectors where thermal analysis supports reliable engineering decisions
SECTORS
The analysis of thermal properties cuts across all sectors that work with materials subjected to variable or extreme temperatures. From the automotive industry to medical devices, a material’s thermal response determines the reliability, safety and service life of the end product.
INFINITIA tailors its approach to the regulatory and functional requirements of each sector, selecting the test methods and test profiles that best reflect the actual operating conditions. The six sectors in which this service delivers the greatest value are outlined below.
Thermal property analysis at INFINITIA for industrial reliability and competitiveness
Value
Thermal property analysis delivers direct technical value: it translates a material’s response to temperature into objective design, selection and validation criteria. Precise thermal characterisation reduces uncertainty in decisions that would otherwise rely on catalogue data that may not reflect actual service conditions.
This approach has a direct impact on industrial decision-making. Determining a material’s conductivity, thermal expansion or thermal stability makes it possible to anticipate failures before they occur, adopt a preventative strategy and base every decision on measured data. Integrating thermal characterisation with microstructural and mechanical analysis provides a comprehensive view of the component, which is essential when the failure has a thermal origin that cannot be detected by conventional inspection.
Thermal characterisation also contributes to economic and operational optimisation. Matching the material to the actual thermal conditions prevents oversizing, reduces production losses due to out-of-specification batches and extends the component’s service life. The result is a more reliable and competitive product, with fewer service incidents and a technically sound choice of materials.
In regulated sectors such as aeronautics, medical devices and electric mobility, where traceability and data accuracy are essential requirements, INFINITIA positions itself as a strategic technical partner. The combination of analytical precision and industrial insight, recognised with the ASTER 2025 Award for Digital Innovation, positions INFINITIA as an external technical partner capable of interpreting the thermal behaviour of materials and translating this into sound engineering decisions.
