--- type: "WebPage" title: "ISO 15350 Testing" description: "Do you need to perform carbon and sulfur analysis according to ISO 15350? Securing metallic materials for the ASD sector with ISO 15350 In the Aerospace, Space, and Defense (ASD) sectors, the chemical purity of iron alloys is a safety..." resource: "https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/iso-15350-testing/" tags: ["EN", "pll_698c3827772ac"] timestamp: "2026-04-22T08:02:25Z" published: "2026-02-11T08:11:44Z" language: "en" author: "Filab" --- # ISO 15350 Testing ## Do you need to perform carbon and sulfur analysis according to ISO 15350? ### Securing metallic materials for the ASD sector with ISO 15350 In the [Aerospace](https://filab.fr/en/sectors-of-activity/laboratory-analysis-aeronautics-aerospace.md), [Space](https://filab.fr/en/sectors-of-activity/laboratory-analysis-aeronautics-aerospace.md), and [Defense](https://filab.fr/en/sectors-of-activity/laboratory-analyses-tests-defense-security-sector.md) (ASD) sectors, the chemical purity of [iron alloys](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/iron-alloys-analysis-at-filab-laboratory.md) is a safety imperative. An uncontrolled concentration of Carbon or Sulfur can alter the [mechanical](https://filab.fr/en/our-services/our-expertise-services/mechanical-laboratory-test.md) properties and [corrosion resistance](https://filab.fr/en/our-services/our-expertise-services/laboratory-analysis-deposit-contamination/corrosion-resistance-testing.md) of your **essential parts**. **ISO 15350** defines a reference method for the determination of Carbon and Sulfur content in [steels](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/laboratory-of-analysis-and-expertise-of-steels.md) and [cast irons](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/laboratory-analysis-cast-iron.md) by infrared absorption spectrometry after combustion in an induction furnace. This method is recognized for its high precision and its ability to detect extremely low content levels. At**FILAB,** we support manufacturers in the ASD supply chain with the characterization and control of their materials according to ISO 15350. Our goal is clear: to ensure the reliability of your technical and industrial decisions. ### ISO 15350: A key challenge for steel and cast iron quality ### Carbon and sulfur analysis by combustion according to ISO 15350 The ISO 15350 standard is specifically dedicated to the elemental analysis of ferrous metals. It relies on the total combustion of the sample, allowing for a global and representative measurement of the light elements present in the matrix. It is specifically used to: - **Precisely measure** Total Carbon and Sulfur content. - **Validate compliance** of steel grades (non-alloy steels, stainless steels, tool steels). - **Verify the quality** of cast irons before or after forming. In the Aerospace and Defense industries, mastering these elements according to ISO 15350 has a direct impact on: - **Hardness and brittleness** (Carbon content). - **Surface quality** and absence of "hot shortness" (Sulfur content). - **In-service behavior** of **strategic components** subjected to cyclic mechanical stress. ## FILAB, a laboratory tailored to Aerospace & Defense requirements ### An analytical park dedicated to ISO 15350 testing Analysis according to ISO 15350 requires state-of-the-art combustion technology to guarantee complete gas extraction. To meet these demands, **FILAB** provides its clients with high-performance equipment: [### OES](https://filab.fr/en/our-technical-resources/laboratory-analysis-oes-alloys.md) [### ICP](https://filab.fr/en/our-technical-resources/laboratory-analysis-icp-icp-ms-icp-aes.md) [### O,N,H Elemental Analyzers](https://filab.fr/en/our-technical-resources/chons-laboratory-analysis.md) ### Dedicated Material Expertise Services At **FILAB,** ISO 15350 analysis is part of a comprehensive material characterization approach. Our teams work on : Carbon, alloy, and [stainless steels](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/laboratory-analysis-of-your-stainless-steels-according-to-nf-en-10088-standards.md) Samples from production, forging, or foundry Cast irons (grey, ductile...) ### Why Choose FILAB ? - **45 years** of recognized expertise in analysis and materials science - **Dual competence:** Chemistry / Materials - Specializing in **metallic alloys**and **critical applications** - **Customer qualification**: Safran, Dassault Aviation, and Framatome - **ISO 17025 Accreditation** regarding metallic alloys [Discover our accreditations](https://filab.fr/en/about-us/accreditations-en.md) Discover our metallurgical expertise ## Analysis of Iron, Aluminium, Molybdenum, Copper, Tin, Chromium, Titanium, Lead, Nickel, Zinc [Learn more](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory.md) ### Our analytical services based on ISO and ASTM standards for the ASD sector [Analysis according to ASTM E3061 standard](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/astm-analysis-e3061.md) [Analysis according to ASTM E1086 standard](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/astm-analysis-e1086.md) [Analysis according to ASTM E1019 standard](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/astm-analysis-e1019.md) [Analysis according to ISO 8287 standard](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/iso-8287-testing.md) [Analysis according to ASTM B213 standard](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/analysis-astm-b213.md) [Analysis according to ASTM B964 standard](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/astm-analysis-b964.md) [Analysis according to ISO 12154 standard](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/astm-analysis-iso-12154.md) [Analysis according to ASTM E1868 standard](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/astm-analysis-e1868.md) [Analysis according to ASTM E1409 standard](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/astm-e1409-analysis.md) [Analysis according to ASTM E415 standard](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/astm-analysis-e415.md) [Analysis according to ASTM E1251 standard](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/astm-analysis-e1086.md) [Analysis according to ASTM E1941 standard](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/analysis-astm-e1941.md) [Analysis according to ISO 4935 standard](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/iso-4935-analysis.md) [Analysis according to ISO 4490 standard](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/iso-4490-analysis.md) [Analysis according to ASTM B527 standard](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/astm-analysis-b527.md) [Analysis according to ASTM B923 standard](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/astm-analysis-b923.md) [Analysis according to ASTM A269 standard](https://filab.fr/en/our-services/our-analysis-services/metallurgical-analysis-laboratory/astm-analysis-a269.md) ### Our analytical services in accordance with MIL requirements for the ASD sector [Analysis according to MIL-T-9047 requirement](https://filab.fr/en/sectors-of-activity/laboratory-analyses-tests-defense-security-sector/mil-t-9047-analysis.md) [Analysis according to MIL-A-6088 requirement](https://filab.fr/en/sectors-of-activity/laboratory-analyses-tests-defense-security-sector/mil-a-6088-analysis.md) [Analysis according to MIL-DTL-14067 requirement](https://filab.fr/en/sectors-of-activity/laboratory-analyses-tests-defense-security-sector/mil-dtl-14067-analysis.md) [Analysis according to MIL-DTL-5002 requirement](https://filab.fr/en/sectors-of-activity/laboratory-analyses-tests-defense-security-sector/mil-dtl-5002-analysis.md) [Analysis according to MIL-A-22771 requirement](https://filab.fr/en/sectors-of-activity/laboratory-analyses-tests-defense-security-sector/mil-a-22771-analysis.md) [Analysis according to MIL-S-22499 requirement](https://filab.fr/en/sectors-of-activity/laboratory-analyses-tests-defense-security-sector/mil-s-22499-analysis.md) [Analysis according to MIL-P-83348 requirement](https://filab.fr/en/sectors-of-activity/laboratory-analyses-tests-defense-security-sector/mil-p-83348-analysis.md) ### Our additional metallographic analysis [Micrographic analysis](https://filab.fr/nos-prestations/analyse/laboratoire-analyses-metallurgiques/laboratoire-examen-micrographique.md) [Failure analysis](https://filab.fr/nos-prestations/expertise/labo-analyse-etude-de-defaillance.md) [Chemical composition analysis](https://filab.fr/nos-prestations/analyse/laboratoire-analyses-metallurgiques/laboratoire-analyse-alliage-metallique.md) [Metallurgical analysis](https://filab.fr/nos-prestations/analyse/laboratoire-analyses-metallurgiques.md) [Metallographic analysis](https://filab.fr/nos-prestations/analyse/laboratoire-analyses-metallurgiques/caracterisation-par-coupe-metallographique.md) [Elemental analysis](https://filab.fr/en/our-services/our-analysis-services/chemical-analysis-laboratory/laboratory-elemental-analysis.md) [Analysis of metallic alloys](https://filab.fr/en/analysis-of-metallic-alloys-in-the-laboratory.md) ### Accreditation This [Nadcap accreditation](https://filab.fr/en/about-us/accreditations-en/materials-testing-nadcap-laboratory.md) notably covers: ✔️ Chemical analysis (ICP-OES) of critical metallic alloys (Al, Fe, Ni, Ti) ✔️ Metallography An international recognition that confirms our commitment to quality and reliability for the most demanding applications, particularly in the aerospace sector. ![](https://filab.fr/wp-content/uploads/2026/04/PNG-bleu-e1775737225243-1024x446.png) [Explore our accreditations](https://filab.fr/en/about-us/accreditations-en.md) ## FAQ What materials are analyzed according to ISO 15350 ? This standard is strictly dedicated to **steels and cast irons**. It covers a wide range of concentrations, from ultra-low carbon steels to highly alloyed cast irons. How does infrared detection work?  During combustion under oxygen, Carbon is converted into CO2 and Sulfur into SO2. These gases absorb light at specific wavelengths in the **infrared spectrum**. The absorption intensity is directly proportional to the quantity of the element present in the sample. What is the difference between ISO 15350 and ASTM E1019? Although the techniques are similar (Combustion and IR), ISO 15350 is the preferred **international reference** on certain European markets, while ASTM E1019 is more commonly cited in American specifications. Filab is able to comply with both standards. What sample preparation is required? The sample must be clean and free of surface contaminants (oils, greases). Filab systematically performs **rigorous cleaning** prior to analysis to measure only the Carbon and Sulfur **in the bulk material** (core).