Thermal module testing service

Thermal Module Testing Service – Accredited ISO/IEC 17025 Thermal Performance and Reliability Testing for the Colombian Market

Thermal modules are critical components in electronic devices, power electronics, automotive systems, LED lighting, medical equipment, and industrial machinery, where efficient heat dissipation and temperature control are essential for performance, reliability, and safety. These modules, which include heat sinks, heat pipes, vapor chambers, thermoelectric coolers (TECs), and liquid cooling plates, must meet stringent thermal performance requirements to prevent overheating, reduce thermal stress, and extend the service life of the entire system. In the Colombian market, where the Superintendencia de Industria y Comercio (SIC), the Ministerio de Minas y Energía (MinMinas), and the Dirección de Impuestos y Aduanas Nacionales (DIAN) enforce quality and safety standards for electronic and industrial equipment, the accurate evaluation of thermal module performance is essential for product certification, quality control in manufacturing, supplier qualification, and import/export processes. Our laboratory offers a comprehensive thermal module testing service, applying standardized methods to measure thermal resistance, thermal impedance, heat dissipation capacity, temperature uniformity, power cycling endurance, and environmental reliability. All tests are performed under our ISO/IEC 17025 (CNAS) accreditation, and the resulting reports are fully accepted by Colombian authorities, making them indispensable for regulatory compliance, product validation, and market access in Colombia.

Thermal Module Samples We Regularly Test

Our laboratory receives a wide variety of thermal modules and cooling components for performance and reliability testing. Typical samples include:

• Heat sinks and heat spreaders – extruded, stamped, skived, and bonded-fin aluminum and copper heat sinks, with and without fans.
• Heat pipes and vapor chambers – for high-performance cooling in laptops, servers, and telecom equipment.
• Thermoelectric coolers (TECs) and Peltier modules – for spot cooling and temperature stabilization.
• Liquid cooling plates and cold plates – for high-power electronics, IGBT modules, and automotive battery cooling.
• Fan sinks and active cooling assemblies – with integrated fans or blowers.
• Thermal interface materials (TIMs) – tested in conjunction with modules – for evaluating the contact resistance between the module and the heat source.
• Thermal modules for LED lighting and automotive headlights – for reliability and heat dissipation performance.
• Prototype and new thermal module designs – submitted by manufacturers for validation of thermal performance before series production.
• Modules retrieved from field service – for failure analysis and remaining life assessment.

Thermal Resistance and Thermal Impedance Measurement – Steady-State Testing

Thermal resistance (Rth) and thermal impedance (Zth) are the most fundamental parameters for evaluating a thermal module's performance. Our steady-state tests determine the temperature rise per unit of power dissipation, following international standards and the requirements of the Colombian electronics and automotive sectors.

• Thermal resistance measurement (ASTM D5470 / JESD 51-1 / NTC 6000) – the thermal module is mounted on a calibrated test fixture (a heated copper block or a thermal test die) with a known power input. The temperature of the heat source and the temperature of the module's cold side (or ambient) are measured using thermocouples or thermistors. The thermal resistance is calculated as Rth = (T_hot – T_cold) / P, where P is the applied power (in W). We report the thermal resistance (in °C/W) at the specified power level and airflow condition. The test is performed at multiple power levels (e.g., 10 W, 20 W, 30 W) to obtain the Rth curve.
• Thermal impedance measurement under transient conditions (JESD 51-14 / NTC 6001 – for power semiconductors and modules) – for modules used in pulsed power applications (e.g., IGBTs, power MOSFETs), we measure the thermal impedance Zth(t) by applying a step power pulse and recording the temperature response over time. The thermal impedance curve (Zth vs. time) is generated, and the thermal time constants (τ1, τ2, τ3) are extracted. We report the Zth curve, the thermal time constants, and the steady-state Rth derived from the Zth curve.
• Thermal resistance with different airflow conditions (NTC 6002 – fan speed and airflow variation) – for active heat sinks, we measure the thermal resistance at different fan speeds (e.g., 0, 50, 75, and 100 % of the rated speed) and at different ambient temperatures (e.g., 25 °C, 40 °C, 60 °C). We report the Rth vs. airflow speed curve and the Rth vs. ambient temperature curve.
• Thermal resistance with different interface materials (NTC 6003 – TIM evaluation) – we test the same thermal module with different thermal interface materials (grease, pad, phase-change, or solder) to evaluate the effect of the TIM on the overall thermal resistance. We report the thermal resistance for each TIM and the relative improvement (or degradation).
• Thermal resistance measurement at high power and high temperature (NTC 6004 – power cycling and thermal stability) – the module is subjected to a high power level (up to 90 % of the maximum rating) for an extended period (up to 100 hours), and the thermal resistance is measured at intervals to detect any degradation due to thermal aging. We report the Rth drift over time.

Heat Dissipation Capacity and Cooling Performance Evaluation

In addition to thermal resistance, the total heat dissipation capacity (in watts) and the maximum allowable power dissipation are critical parameters for matching the module to the thermal load. Our tests directly measure the maximum heat dissipation capability of the module under specified operating conditions.

• Maximum power dissipation test (NTC 6010 – heat dissipation limit) – the thermal module is mounted on a heat source (power resistor or thermal test die), and the power is gradually increased until the temperature of the heat source reaches a specified limit (e.g., 85 °C for a typical electronic component). The maximum power dissipation (in W) is recorded. We report the maximum heat dissipation capacity and the corresponding temperature rise.
• Temperature uniformity test (NTC 6011 – on the module surface and across the heat spreader) – using an infrared camera or a thermocouple matrix, we measure the temperature distribution across the surface of the thermal module (e.g., the base plate or the heat spreader). The maximum temperature difference (ΔTmax) and the temperature gradient are reported. This is critical for applications requiring uniform cooling (e.g., CPU cooling, battery thermal management).
• Cooling performance at different orientations (NTC 6012 – gravity effect on heat pipes and vapor chambers) – for heat pipes and vapor chambers, we test the thermal module in multiple orientations (horizontal, vertical, and tilted) to evaluate the effect of gravity on the heat transfer performance. We report the thermal resistance and the maximum heat transfer capacity for each orientation.
• Cooling performance under pulsating heat load (NTC 6013 – transient thermal response) – the module is subjected to a pulsating heat load (e.g., square wave or sine wave power profile) and the temperature response is recorded. The thermal time constant and the ability to smooth temperature fluctuations are evaluated. We report the thermal response time and the peak-to-peak temperature variation.
• Cooling performance with different coolants (NTC 6014 – for liquid-cooled modules) – for liquid-cooled cold plates, we test the module with different coolants (water, water-glycol, dielectric fluid) at different flow rates and inlet temperatures. We report the thermal resistance and the pressure drop for each coolant.

Reliability and Lifetime Testing – Power Cycling, Thermal Cycling, and Thermal Shock

Thermal modules are subjected to cyclic thermal stresses during operation due to power variations and ambient temperature changes. Our reliability tests evaluate the endurance of the module under these conditions, identifying potential failure mechanisms such as solder joint fatigue, delamination, thermal fatigue, and degradation of the thermal interface. These tests are essential for qualifying modules for automotive, aerospace, and industrial applications, and are required by the MinMinas and SIC for certification of safety-critical equipment.

• Power cycling test (JESD 22-A105 / IEC 60749-34 / NTC 6020) – the thermal module is mounted on a thermal test die or a power semiconductor, and subjected to repeated power pulses (ON/OFF cycles) that cause temperature swings (e.g., from 25 °C to 125 °C). The number of cycles is typically 1,000 to 10,000. The thermal resistance is measured at intervals, and the module is inspected for cracks, delamination, or performance degradation. We report the number of cycles completed, the change in thermal resistance (ΔRth), and any visual damage.
• Thermal cycling test (IEC 60749-25 / NTC 6021 – without power application) – the module is placed in a thermal chamber and subjected to temperature cycles (e.g., from -40 °C to +125 °C) at a specified ramp rate (e.g., 10 °C/min) and dwell time (e.g., 15 minutes). The number of cycles is typically 100, 500, or 1000. The module is visually inspected and functionally tested (thermal resistance measurement) after the cycling. We report the post-cycling thermal resistance and any visual anomalies.
• Thermal shock test (IEC 60749-41 / NTC 6022 – liquid-to-liquid or air-to-air) – the module is rapidly transferred between two liquid baths (e.g., -55 °C and +125 °C) or between two thermal chambers, with a transfer time of less than 10 seconds. The test is performed for 100, 200, or 500 cycles. We report the thermal resistance after the shock test and any cracks or delamination observed.
• Highly accelerated life test (HALT) – NTC 6023 – step-stress thermal cycling – the module is subjected to progressively increasing temperature extremes (e.g., from -50 °C to +150 °C) while monitoring its thermal performance. The failure limits are identified. We report the temperature limits for reliable operation.
• Thermal fatigue test (NTC 6024 – long-term thermal cycling up to 10,000 cycles) – for modules intended for high-reliability applications (e.g., railway, aerospace), we perform extended thermal cycling up to 10,000 cycles and monitor the degradation of thermal resistance. We report the lifetime estimate and the predicted service life.

Environmental and Mechanical Durability Tests – Moisture, Salt Spray, and Vibration

Thermal modules are often installed in harsh environments where they are exposed to moisture, salt spray, dust, and mechanical vibration. Our environmental and mechanical tests evaluate the module's robustness and its ability to maintain thermal performance under such conditions. These tests are required for products used in Colombian coastal areas, high-altitude mines, and industrial settings.

• Humidity and condensation test (IEC 60068-2-78 / NTC 6030 – damp heat, steady state) – the module is exposed to 40 °C and 93 % RH for 240 hours, and then the thermal resistance is re-measured. We report the change in thermal resistance and any corrosion or oxidation.
• Salt spray test (ASTM B117 / NTC 6031 – for coastal and marine applications) – the module is exposed to a 5 % NaCl salt spray for 240 hours. The module is inspected for corrosion, and the thermal resistance is re-measured. We report the corrosion level and the thermal resistance degradation.
• Dust and particle ingress test (IEC 60529 / NTC 6032 – IP5X and IP6X) – for modules with fans or open fins, we perform a dust test to evaluate the effect of dust accumulation on cooling performance. The thermal resistance is measured before and after the dust test. We report the increase in thermal resistance due to dust clogging.
• Vibration test (IEC 60068-2-6 / NTC 6033 – for modules in moving vehicles) – the module is subjected to sinusoidal vibration (10 to 500 Hz, 2 g) for 2 hours in each of the three axes. The thermal resistance is re-measured after the vibration to detect any loosening of components or degradation of the thermal interface. We report the change in thermal resistance and any mechanical damage.
• Mechanical shock test (IEC 60068-2-27 / NTC 6034) – the module is subjected to a mechanical shock (30 g, 11 ms half-sine pulse) in three axes. The module is functionally tested after the shock. We report the thermal resistance after shock and any visible damage.

Complementary Analysis – Thermal Interface Material Characterization and Failure Analysis

To fully understand the thermal performance and the failure mechanisms of the module, we complement the functional tests with analysis of the thermal interface materials (TIMs) and the module's internal structure. These analyses are critical for root-cause investigation and for improving product design.

• Thermal interface material (TIM) thickness and uniformity measurement (NTC 6040 – optical or contact measurement) – we measure the thickness of the TIM layer (e.g., thermal grease, pad, or phase-change material) using a micrometer or an optical profilometer. We report the average thickness and the uniformity across the interface.
• Thermal conductivity of TIM (ASTM D5470 / NTC 6041 – on separate TIM samples) – for TIM samples, we measure the thermal conductivity (in W/m·K) using the steady-state method. We report the thermal conductivity and the thermal resistance of the TIM layer.
• Cross-sectional inspection of the module (SEM and EDS – NTC 6042) – we cut a cross-section of the module and examine the interface between the heat source, the TIM, and the heat spreader, to detect voids, cracks, or delamination. We report the quality of the interface and any abnormalities.
• X-ray inspection of internal solder joints and bonding layers (NTC 6043 – for modules with soldered or brazed connections) – we perform an X-ray inspection to detect voids, cracks, or poor bonding in the solder or brazing layers, which could increase thermal resistance. We report the quality of the internal joints.
• Infrared thermography during operation (NTC 6044 – real-time thermal imaging) – during the power test, we use an infrared camera to capture thermal images of the module surface and the heat source. This helps identify hotspots, uneven cooling, and the effectiveness of the heat spreader. We report the thermal images and the temperature distribution.

Test Report and Recognition in the Colombian Electronic and Industrial Sector

All procedures described are within the scope of our ISO/IEC 17025 accreditation, with equipment calibrated periodically (thermal test stations, thermocouples, power supplies, thermal chambers, etc.) and traceability to international standards (NIST, PTB). Our test reports are issued in Spanish and include:

• Full identification of the thermal module (manufacturer, model, serial number, type, dimensions, rated power, material composition, and intended application).
• Detailed description of the test methods applied (ASTM/JESD/IEC/NTC standards, test conditions, power levels, temperatures, airflow rates, and number of cycles).
• Numerical results: thermal resistance (°C/W), thermal impedance (Zth curve), maximum power dissipation (W), temperature uniformity (ΔTmax), thermal resistance degradation (%), and lifetime (cycles or hours).
• Graphical data: Rth vs. power curves, Zth vs. time curves, temperature distribution maps, and failure distribution data.
• Comparative tables against the values specified by the client or against the limits of the NTC 6000 (Thermal resistance), NTC 6020 (Power cycling), NTC 6030 (Environmental), and the requirements of the SIC, MinMinas, and DIAN for electronics and industrial equipment.
• Photographs and thermal images of the module before and after testing, and in case of failure, images of the damaged areas.
• Recommendations for design improvement (e.g., optimization of the fin geometry, selection of more efficient TIM, improvement of the bonding process, or addition of heat pipes).
• Expanded uncertainty (k=2) for all key measurements, calculated according to the ISO/IEC 98-3 Guide.

These reports are fully accepted by the Superintendencia de Industria y Comercio (SIC) for product registration and quality certification, by the Ministerio de Minas y Energía (MinMinas) for the verification of safety and efficiency in electronic and industrial equipment, and by the Dirección de Impuestos y Aduanas Nacionales (DIAN) for tariff classification and quality verification in the import of thermal modules and cooling components. Additionally, we offer consulting services for the design of optimized thermal solutions, the selection of appropriate TIMs, and the implementation of quality control programs to ensure consistent thermal performance, contributing to the reliability, efficiency, and competitiveness of electronic and industrial products in the diverse and demanding Colombian market, from the high-altitude data centers to the tropical manufacturing plants.