Oxyacetylene ablation testing service

Oxyacetylene Ablation Testing Service – Accredited ISO/IEC 17025 Thermal Protection and Ablation Resistance Assessment for the Colombian Market

Oxyacetylene ablation testing is a critical evaluation method used to assess the thermal protection performance and ablation resistance of materials subjected to extreme heat fluxes, high-temperature gas flows, and erosive environments. This test is essential for materials used in rocket nozzles, re-entry thermal protection systems, hypersonic vehicle components, high-temperature furnace linings, and other applications where materials must withstand severe thermal and mechanical erosion without degrading or losing their protective function. In the Colombian market, where the Superintendencia de Industria y Comercio (SIC), the Ministerio de Minas y Energía (MinMinas), the Agencia Nacional de Hidrocarburos (ANH), and the Dirección de Impuestos y Aduanas Nacionales (DIAN) enforce strict quality, safety, and performance standards for materials used in high-temperature and critical applications, the accurate evaluation of ablation resistance is essential for product certification, supplier qualification, quality control in manufacturing, and import-export processes. Our laboratory offers a comprehensive oxyacetylene ablation testing service, applying standardized methods that simulate the extreme conditions of high-velocity, high-temperature gas flows and measure material loss, thermal degradation, and structural integrity. 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, material validation, and market access in Colombia.

Materials and Components We Regularly Test

Our laboratory receives a wide variety of materials and components for oxyacetylene ablation testing. Typical samples include:

• Carbon-carbon composites – for rocket nozzles, re-entry thermal protection, and brake discs.
• Ceramic matrix composites (CMCs) – for high-temperature structural applications.
• Refractory metals and alloys – tungsten, molybdenum, tantalum, and their alloys for high-temperature components.
• Thermal barrier coatings (TBCs) – for gas turbine blades and combustion chambers.
• Graphite and carbon-based materials – for electrodes, crucibles, and furnace linings.
• Ultra-high-temperature ceramics (UHTCs) – for hypersonic vehicle leading edges and nose cones.
• Protective coatings and paints – for high-temperature and fire-resistant applications.
• Prototype and new thermal protection materials – submitted by manufacturers for validation of ablation resistance before series production.
• Components retrieved from field service – for failure analysis and remaining life assessment.

Oxyacetylene Ablation Test – Principle and Procedure

The oxyacetylene ablation test exposes a test specimen to a high-velocity, high-temperature flame generated by the combustion of oxygen and acetylene. The flame is directed at the surface of the specimen, and the resulting erosion, mass loss, and temperature rise are measured. The test is performed according to international standards and the specific requirements of the Colombian aerospace, energy, and industrial sectors.

• Oxyacetylene ablation test (ASTM E285 / ISO 11120 / NTC 8000 – for thermal protection materials) – a test specimen (typically a flat disc or a rectangular coupon) is mounted in a test fixture and positioned at a specified distance from the oxyacetylene torch. The flame is directed at the specimen surface for a specified duration (typically 10 to 60 seconds). The heat flux is measured using a heat flux sensor. The mass loss, the linear ablation rate (the thickness loss), and the surface temperature (using a pyrometer) are recorded. We report the mass loss (in g), the linear ablation rate (in mm/s or mm/min), the surface temperature (in °C), and the heat flux (in MW/m²).
• Oxyacetylene ablation test at different heat fluxes (NTC 8001 – for performance characterization) – we perform the ablation test at multiple heat flux levels (e.g., 5 MW/m², 10 MW/m², 20 MW/m²) to generate the ablation rate vs. heat flux curve. We report the ablation rate at each heat flux level.
• Oxyacetylene ablation test with different exposure times (NTC 8002 – for transient behavior) – we perform the test at different exposure times (e.g., 10 s, 30 s, 60 s) to evaluate the transient ablation behavior. We report the ablation rate as a function of time.
• Oxyacetylene ablation test with thermocouple measurement (NTC 8003 – for in-depth temperature profile) – we embed thermocouples at different depths in the specimen to measure the temperature profile during the ablation test. We report the temperature-time curves and the thermal gradient.
• Oxyacetylene ablation test with simulated pressure (NTC 8004 – for high-pressure environments) – we perform the ablation test under a controlled pressure (e.g., 1 atm, 5 atm, 10 atm) to simulate the conditions of rocket motors and high-pressure combustion chambers. We report the ablation rate and the mass loss at the specified pressure.
• Oxyacetylene ablation test with water spray (NTC 8005 – for wet or corrosive environments) – we add a water spray (or a salt spray) to the ablation test to simulate the effects of moisture and corrosion on the ablation behavior. We report the ablation rate and the surface condition.

Measurement of Ablation Rate and Mass Loss – Quantifying Material Erosion

The primary results of the oxyacetylene ablation test are the linear ablation rate and the mass loss, which quantify the material erosion caused by the high-temperature gas flow. These parameters are essential for ranking materials, validating models, and ensuring the performance of thermal protection systems.

• Linear ablation rate measurement (NTC 8010 – using a micrometer or a profilometer) – the thickness of the specimen is measured before and after the ablation test using a micrometer or a contact profilometer. The linear ablation rate is calculated by dividing the thickness loss by the exposure time. We report the linear ablation rate (in mm/s or mm/min).
• Mass loss measurement (NTC 8011 – using a high-precision balance) – the specimen is weighed before and after the ablation test using a high-precision balance (accuracy of 0.1 mg). The mass loss is calculated as the difference between the initial mass and the final mass. We report the mass loss (in g) and the mass loss rate (in g/s).
• Surface profile measurement (NTC 8012 – for detecting surface erosion patterns) – we use a surface profilometer to measure the surface topography of the specimen after the ablation test, to identify the erosion pattern (e.g., the central crater, the edge erosion). We report the surface profile and the maximum erosion depth.
• Microscopic examination (SEM – NTC 8013 – for surface analysis) – we use a scanning electron microscope (SEM) to examine the ablated surface for the presence of cracks, charring, oxidation, or micro-cracking. We report the SEM images and the surface condition.
• Thermal imaging (NTC 8014 – for temperature distribution on the surface) – we use an infrared camera to measure the temperature distribution on the surface of the specimen during the ablation test, to identify hotspots and temperature gradients. We report the thermal images and the surface temperature profile.

Characterization of Microstructural and Chemical Changes – Understanding Ablation Mechanisms

To understand the mechanisms of ablation and to determine the cause of material loss, we perform a series of complementary analyses, including microstructural examination, phase analysis, and chemical characterization. These analyses are essential for identifying the dominant ablation mechanisms (e.g., sublimation, oxidation, melting, or mechanical erosion) and for improving the performance of the material.

• X-ray diffraction (XRD) – ASTM E1857 / NTC 8020 – for phase analysis – we analyze the ablated surface and the unablated material to detect any phase transformations (e.g., the formation of oxides, carbides, or decomposition products). We report the phase composition and the changes in the phase content.
• Scanning electron microscopy (SEM) and EDS – ASTM E1508 / NTC 8021 – for microstructural analysis – we examine the ablated surface and the cross-section of the specimen to detect the formation of reaction layers, the presence of cracks, the depth of the heat-affected zone, and the morphology of the ablation products. We report the SEM images, the EDS spectra, and the microstructural observations.
• Thermogravimetric analysis (TGA) – ASTM E1131 / NTC 8022 – for thermal stability – we measure the thermal stability and the decomposition temperature of the material, to correlate with the ablation behavior. We report the TGA curve and the decomposition temperature.
• Differential scanning calorimetry (DSC) – ASTM D3418 / NTC 8023 – for thermal properties – we measure the specific heat, the heat of fusion, and the glass transition temperature (Tg) of the material, to help understand the thermal response during ablation. We report the DSC curve and the thermal properties.
• Hardness testing (ASTM E18 / NTC 8024 – for assessing the heat-affected zone) – we measure the hardness of the material in the heat-affected zone and the unablated region, to detect any softening or hardening caused by the thermal exposure. We report the hardness profile and the depth of the heat-affected zone.

Thermal Shock and Thermal Cycling Under Extreme Conditions

In many real-world applications, thermal protection materials are subjected to thermal shock and thermal cycling (repeated heating and cooling) in addition to the steady-state ablation. Our thermal shock and thermal cycling tests simulate these combined effects, providing a more realistic assessment of the material's performance and durability under extreme conditions.

• Thermal shock test (NTC 8030 – for assessing crack resistance) – we subject the specimen to a rapid temperature change by heating it to a high temperature (e.g., 1000 °C) in the oxyacetylene flame and then quenching it in water or by removing the heat source. We inspect the specimen for cracking, spalling, or delamination. We report the number of thermal shock cycles to failure and the failure mode.
• Thermal cycling test (NTC 8031 – for repeated heating and cooling) – we subject the specimen to multiple cycles of heating (using the oxyacetylene flame) and cooling (by natural convection or forced air). The number of cycles is typically 10 to 100. We measure the mass loss and the ablation rate after each cycle, and we report the cumulative degradation.
• Thermal shock with simultaneous mechanical load (NTC 8032 – for stress-assisted ablation) – we apply a mechanical load (tensile or flexural) to the specimen during the thermal shock test, to evaluate the combined effect of thermal stress and mechanical stress. We report the time to failure and the failure mode.
• Thermal cycling under corrosive atmosphere (NTC 8033 – for combined corrosion and thermal stress) – we perform the thermal cycling test in a corrosive atmosphere (e.g., with a salt spray or with an acidic gas) to simulate the conditions of marine environments or industrial emissions. We report the mass loss, the ablation rate, and the corrosion damage.
• Thermal shock with thermal imaging monitoring (NTC 8034 – for real-time damage detection) – we use an infrared camera to monitor the surface temperature during the thermal shock test, to detect the initiation of cracks (which cause localized heating). We report the thermal images and the detection of damage.

Post-Test Evaluation – Mechanical Properties and Structural Integrity

After the ablation test, the residual mechanical properties and the structural integrity of the specimen are evaluated to assess the extent of damage and the remaining life of the material. These tests are essential for the certification of thermal protection systems and for the determination of the safe operating limits.

• Residual flexural strength (ASTM D790 / NTC 8040 – for composites and ceramics) – we perform a three-point or four-point bending test on the ablated specimen to determine the residual flexural strength. We report the residual flexural strength (in MPa) and the retention of strength (in %).
• Residual compressive strength (ASTM D695 / NTC 8041 – for porous materials) – we perform a compression test on the ablated specimen to determine the residual compressive strength. We report the residual compressive strength (in MPa) and the retention of strength.
• Residual tensile strength (ASTM D638 / NTC 8042 – for polymer matrix composites) – we perform a tensile test on the ablated specimen to determine the residual tensile strength. We report the residual tensile strength and the retention of strength.
• Residual hardness (ASTM E18 / NTC 8043 – for metallic and ceramic materials) – we measure the residual hardness of the ablated specimen to detect any softening or hardening caused by the thermal exposure. We report the residual hardness and the change in hardness.
• Non-destructive evaluation (NDE) – ultrasonic testing (NTC 8044 – for detecting internal damage) – we use ultrasonic testing (UT) to inspect the ablated specimen for internal damage (cracks, delaminations, or voids). We report the UT results and the extent of the damage.

Test Report and Recognition in the Colombian Aerospace, Energy, and Industrial Sector

All procedures described are within the scope of our ISO/IEC 17025 accreditation, with equipment calibrated periodically (oxyacetylene torches, heat flux sensors, balances, SEM, XRD, etc.) and traceability to international standards (NIST, PTB). Our test reports are issued in Spanish and include:

• Full identification of the test sample (material, composition, manufacturer, lot number, dimensions, and intended application).
• Detailed description of the test methods applied (ASTM/ISO/NTC standards, heat flux, exposure time, and pressure).
• Numerical results: mass loss (g), linear ablation rate (mm/s), surface temperature (°C), heat flux (MW/m²), residual strength (MPa), and retention of strength (%).
• Graphical data: temperature vs. time curves, mass loss vs. time curves, and ablation rate vs. heat flux curves.
• Comparative tables against the values specified by the client or against the limits of the NTC 8000 (Ablation), NTC 8040 (Residual strength), and the requirements of the SIC, MinMinas, ANH, and DIAN for thermal protection materials and high-temperature components.
• Photographs and micrographs (SEM) of the specimen before and after the test, showing the surface erosion, cracks, and microstructural changes.
• Recommendations for material selection, design improvement, and manufacturing process optimization to enhance the ablation resistance and the service life of the component.
• 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) and the Agencia Nacional de Hidrocarburos (ANH) for the validation of high-temperature materials used in the energy and mining sectors, and by the Dirección de Impuestos y Aduanas Nacionales (DIAN) for tariff classification and quality verification in the import of thermal protection materials and advanced composites. Additionally, we offer consulting services for the development of high-temperature materials, the design of thermal protection systems, and the implementation of quality control programs for ablation resistance, contributing to the safety, reliability, and performance of aerospace, energy, and industrial applications in the diverse and growing Colombian market.