Dimethyl carbonate (DMC) plays a critical role in lithium-ion battery electrolytes, where solvent purity directly impacts performance, safety, and lifetime. Even trace-level impurities can contribute to degradation of solid electrolyte interfaces, consumption of lithium ions, or gas formation—effects that compromise both efficiency and safety.As battery materials continue to evolve, analytical approaches must provide both high sensitivity and high-confidence identification. A recent LECO application study demonstrates how combining two GC-MS platforms enables a more complete characterization of DMC impurities than either approach alone.<h3>Why Impurity Characterization in DMC Is Challenging</h3>Battery-grade solvents demand detection of contaminants across a wide concentration range, starting from major byproducts to trace-level species. In DMC, impurities may include oxygenated compounds, hydrocarbons, and nitriles, many of which arise from synthesis or handling processes.These compounds can co-elute or exist at levels below typical detection thresholds, making comprehensive analysis difficult with a single analytical technique. In addition, electron ionization (EI) spectra do not always provide a clear molecular ion, complicating compound confirmation.<h3>A Complementary Analytical Strategy: Sensitivity + Confidence</h3>The application note demonstrates a combined workflow using the approach:<ul><li><a target="_blank" rel="noopener noreferrer" href="https://gcms.labrulez.com/products/1097">Pegasus BTX (GC-TOFMS)</a>&nbsp;for high-sensitivity detection</li><li><a target="_blank" rel="noopener noreferrer" href="https://gcms.labrulez.com/products/38">Pegasus HRT (high-resolution GC-MS)</a>&nbsp;for accurate mass confirmation</li></ul>The Pegasus BTX enables detection of impurities at below parts-per-billion levels, ensuring that even low-abundance analytes are captured.Following detection, the Pegasus HRT provides high-resolution, accurate mass data in both EI and positive chemical ionization (PCI) modes. PCI is particularly valuable when EI spectra lack a clear molecular ion, allowing confirmation through common adduct species such as protonated molecular ions [M+H]⁺.Because both ionization modes can be accessed without hardware changes, the workflow supports efficient, multi-dimensional confirmation of analyte identity.<h3>Observations</h3>Using this combined approach, multiple classes of impurities were identified in the DMC sample. These included:<ul><li>Oxygenated reaction byproducts</li><li>Alcohols, carbonates, and ethers</li><li>Hydrocarbons and aromatic species</li><li>Additional low-level analytes detected with high library match scores</li></ul>Importantly, the high sensitivity of the Pegasus BTX revealed a broader set of low-concentration compounds, while the Pegasus HRT increased confidence in compound identification through accurate mass measurements and confirmation of molecular formulas. &nbsp;The study also highlights cases where co-eluting compounds were successfully deconvoluted, allowing individual components to be identified even without complete chromatographic separation.<h3>Why This Matters for Battery Materials Analysis</h3>This work illustrates a key principle for advanced materials characterization: detection and identification are distinct challenges that often require complementary solutions.<ul><li>Detection alone&nbsp;is insufficient without confident identification</li><li>High-resolution confirmation&nbsp;is limited if low-level species are not first detected</li></ul>By combining these capabilities, laboratories can gain deeper insight into solvent purity, production processes, and potential performance risks in battery systems.<h3>Explore the Complete Study</h3>This short overview highlights only a portion of the findings. The full application note provides:<ul><li>Detailed acquisition parameters and workflows</li><li>Chromatographic and spectral data examples</li><li>Confirmed impurity lists with retention times and similarity scores</li><li>Examples demonstrating EI/PCI complementarity and accurate mass confirmation</li></ul>To better understand how complementary GC-MS techniques can improve confidence in battery solvent analysis, download the full application note: <a target="_blank" rel="noopener noreferrer" href="https://www.leco.com/documents/203-821-731/">“Battery Solvent Characterization: Identifying Impurities in Dimethyl Carbonate”.</a>

 Confident Identification of Battery Solvent Impurities Using Complementary GC-MS Techniques

The international standard ISO/IEC 17025 [1] clause 7.7.2 with regards to ensuring the validity of results, requires a laboratory to participate in proficiency testing (PT) and/or to participate in interlaboratory comparisons (ILCs) other than PT. However, no guidance as to what these other ILCs might be, or indeed how they might compare in relation to PT, is provided. This leaflet aims to outline other ILCs available, pointing out some of the limitations as compared to PT.&nbsp;There are three major types of ILCs in which a group of laboratories analyses identical portions from a homogeneous, stable test sample, with each type being characterized by its intended purpose [2,3]:<img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Eurachem_Interlaboratory_comparisons_other_than_proficiency_testing_2_d9263807fb.jpg" alt="Eurachem: Interlaboratory comparisons other than proficiency testing" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Eurachem_Interlaboratory_comparisons_other_than_proficiency_testing_2_d9263807fb.jpg 245w," sizes="100vw" width="1507" height="607">A key point is that PT is an ILC that is designed to specifically evaluate the performance of participants, providing them with an infrastructure to monitor and assess the validity of their results. This is not the key purpose of the two other ILCs, and thus depending on their intended purpose they have a number of limitations that laboratories need to be aware of when using them rather than PT. Only proficiency testing should have been conducted in full compliance to the competency standard ISO/IEC 17043 [4].&nbsp;<h4>Evaluation of measurement procedure performance&nbsp;</h4>These ILCs, are designed to assess how a particular measurement procedure performs and whether it is fit for its intended purpose. These ILCs are often referred to as a ‘method performance study’ or a ‘collaborative study’ [2]. Some limitations of using such ILCs for monitoring laboratory performance as an alternative to PT are:&nbsp;<ul><li>All participants use the same measurement procedure i.e. the measurement procedure that is being validated. Unless the measurement procedure is being routinely used by the participating laboratory such an ILC will not assess the routine performance of the laboratory using their own routine measurement procedure. Nor does it enable them to compare their performance with other laboratories using alternative measurement procedures.&nbsp;</li><li>The measurement procedure is likely to be new, so participants may not have established stable procedures and quality control, so performance may not reflect routine use.&nbsp;</li><li>The report from such an ILC would not provide information on the performance of the participant, if the statistical model used makes the assumption that all laboratories perform with equal variability.</li><li>The design of the study may require the participants to assess multiple samples and/or to undertake multiple replicate analysis on the test materials. This may not be representative of the routine measurements or tests undertaken by the laboratory.&nbsp;</li><li>The conclusion of the ILC might be that the measurement procedure being assessed is not valid.&nbsp;</li></ul><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Eurachem_Interlaboratory_comparisons_other_than_proficiency_testing_3_a53ecd2f5d.jpg" alt="Eurachem: Interlaboratory comparisons other than proficiency testing" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Eurachem_Interlaboratory_comparisons_other_than_proficiency_testing_3_a53ecd2f5d.jpg 157w," sizes="100vw" width="570" height="566"><h4>Characterisation of candidate reference materials&nbsp;</h4>These are ILCs that assign a property value to a candidate reference material, usually with a stated measurement uncertainty. These are often referred to as a ‘material certification study’ [2]. Limitations of using such ILCs as an alternative to PT are:&nbsp;<ul><li>The analysis of the candidate reference material is likely to require additional care in exercising the routine measurement procedure, such as substantially more replication, and/or may require quite different reporting formats (e.g. all valid replicates instead of a mean result). Thus, such an ILC will not necessarily provide an evaluation of the performance of the laboratory based on the routine use of their measurement procedures.&nbsp;</li><li>The report from such an ILC may include the results from the participating laboratories but would not provide information on the performance of each laboratory.&nbsp;</li><li>Participating laboratories may be required to assess multiple samples and/or to undertake multiple replicate analysis on the candidate reference materials. Thus this may not be representative of the routine measurements or tests undertaken by the laboratory.&nbsp;</li></ul><h4>Other ILCs&nbsp;</h4>Some other ILCs, whilst not being conducted in full compliance of the requirements of ISO/IEC 17043, may be designed to evaluate participant performance. These would include small ILCs as defined by EA‑2/21 [5] or split sample ILCs i.e. where a portion of a single sample is sent to two or three laboratories. Whilst these ILCs are specifically designed to evaluate participant performance, they may not provide a comprehensive comparison that a PT might provide. In such cases the laboratory needs to evaluate carefully the competence of the organization managing the ILC and the suitability of the service externally provided (ISO/IEC 17025 clause 6.6).

Interlaboratory comparisons other than proficiency testing

RI Calibration in NIST26 Chromatogram and Applying to Calculating RI in Samples

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Eurachem is a European network promoting international traceability of chemical measurements and good analytical practice. It provides expert guidance, supports method validation, uncertainty evaluation, proficiency testing, and facilitates discussion on technical and policy issues in analytical quality.

Eurachem

In 1936, the Laboratory Equipment Company introduced the first rapid carbon determinator for the American iron and steel industry.  Today, almost 80 years later, LECO is recognized globally as a leader in the development of high-quality analytical instrumentation, mass spectrometers, comprehensive two-dimensional chromatography, metallography & optical equipment as well as consumables.

LECO

My main interest is the identification of organic compounds by mass spectrometry in organic mixtures.

James Little/Mass Spec Interpretation Services

Linde Hydrogen 5.6 – Gas Cylinder

Linde hydrogen 5.6 (≥99.9996%) for ultra-trace GC and analytical applications. Maximum purity and minimal contamination for precise results.

Hydrogen 5.6 from Linde is an ultra-high purity gas (≥ 99.9996%) designed for the most demanding analytical, laboratory, and specialized industrial applications. Its extremely low impurity levels make it ideal for methods where even trace contaminants can significantly impact results.Hydrogen offers exceptional thermophysical properties, enabling efficient heat transfer and stable combustion. It burns with an invisible flame and produces no carbon or soot, ensuring clean and contamination-free processes.Thanks to its ultra-high purity, hydrogen 5.6 is particularly suitable for highly sensitive analytical techniques such as gas chromatography, ensuring maximum reproducibility and reliability. It is supplied in pressurized cylinders for safe and flexible use.<h4>Key Features</h4><ul><li>Ultra-high purity ≥ 99.9996%</li><li>Extremely low trace impurities</li><li>Excellent thermophysical properties</li><li>Clean combustion without carbon or soot</li><li>Colorless, odorless, and tasteless</li><li>Ideal for ultra-trace and high-sensitivity analysis</li></ul><h4>Technical Specifications</h4><ul><li>Gas: Hydrogen (H₂)</li><li>Purity: ≥ 99.9996% (5.6)</li><li>Supply form: pressurized steel cylinder</li><li>Flammability: highly flammable gas</li><li>Flame: invisible, up to approx. 2,834 °C with oxygen</li><li>Properties: colorless, odorless, tasteless</li></ul><h4>Applications</h4><ul><li>Gas chromatography (carrier gas, GC/MS)</li><li>Flame ionization detectors (FID)</li><li>Ultra-trace analytical applications</li><li>Calibration of analytical instruments</li><li>Oxy-fuel welding and metal processing</li><li>Quartz glass processing</li><li>Chemical and metallurgical applications</li><li>Reactor cooling</li><li>Glass fiber production</li><li>Meteorology (balloon gas)</li></ul>

Linde Gas Mixture 0.3% CO + 0.3% CH₄ in Synthetic Air

Calibration gas mixture with 0.3% CO and 0.3% CH₄ in synthetic air. Stable, non-flammable gas for analyzers, detectors, and environmental monitoring.

The gas mixture containing 0.3% carbon monoxide (CO) and 0.3% methane (CH₄) in synthetic air from Linde is designed for calibration and analytical applications. The precisely defined composition of CO, CH₄, oxygen (O₂), and nitrogen (N₂) ensures excellent stability and reproducibility of measurements.The mixture is colorless and odorless and, due to its composition, non-flammable, enhancing safety during handling and use. It is ideal for calibrating gas analyzers, testing detectors, and validating analytical methods.Supplied in pressurized cylinders, the gas can be easily integrated into laboratory and industrial systems.<h4>Key Features</h4><ul><li>Precisely defined gas composition</li><li>Stable concentrations of CO and CH₄</li><li>Non-flammable mixture</li><li>Colorless and odorless</li><li>High reproducibility</li><li>Ideal for calibration and testing</li></ul><h4>Technical Specifications</h4><ul><li>Composition:<ul><li>0.3% carbon monoxide (CO)</li><li>0.3% methane (CH₄)</li><li>balance synthetic air (O₂ + N₂)</li></ul></li><li>Supply form: pressurized steel cylinder<ul><li>10 l (150 bar)</li><li>40 l (150 bar)</li></ul></li><li>Properties: colorless, odorless</li><li>Flammability: non-flammable mixture</li></ul><h4>Applications</h4><ul><li>Calibration of gas analyzers</li><li>CO and CH₄ detector testing</li><li>Environmental monitoring</li><li>Air quality control</li><li>Method validation</li><li>Laboratory and industrial measurement applications</li></ul>

Linde Carbon Dioxide CO₂ 3.0 – Gas Cylinder

CO₂ 3.0 (≥99.9%) gas cylinder for analytical, calibration, and industrial use. Reliable solution for laboratories, research, and manufacturing.

Carbon dioxide CO₂ 3.0 from Linde is a technical-grade gas with a purity of ≥ 99.9%, supplied in pressurized cylinders for a wide range of laboratory, analytical, and industrial applications.Thanks to its stable composition, it is suitable as both an operational and calibration gas in analytical chemistry, including gas chromatography and other measurement techniques. It is also widely used in semiconductor manufacturing, metallurgy, chemical processing, healthcare, and research.CO₂ 3.0 provides a cost-effective solution for applications where ultra-high purity is not required, while still ensuring reliable and reproducible performance.<h4>Key Features</h4><ul><li>Gas purity ≥ 99.9%</li><li>Stable composition for analytical use</li><li>Suitable as operational and calibration gas</li><li>Supplied in pressurized cylinders</li><li>Broad application range</li><li>Cost-effective solution</li></ul><h4>Technical Specifications</h4><ul><li>Gas: carbon dioxide (CO₂)</li><li>Purity: ≥ 99.9% (3.0 grade)</li><li>Supply form: pressurized gas cylinder</li><li>Other available grades:<ul><li>CO₂ for welding</li><li>CO₂ 4.5</li><li>CO₂ 4.8</li><li>CO₂ 5.3</li><li>CO₂ for SFE/SFC</li></ul></li></ul><h4>Applications</h4><ul><li>Operational and calibration gas in analytics</li><li>Gas chromatography and laboratory analysis</li><li>Semiconductor manufacturing</li><li>Metallurgy and chemical industry</li><li>Healthcare and research</li><li>CO₂ lasers</li></ul>

Linde Carbon Dioxide CO₂ 4.5 – Gas Cylinder

Linde CO₂ 4.5 (≥99.995%) gas cylinder for analytics, calibration, and CO₂ lasers. High-purity solution for laboratories, semiconductors, and research.

Carbon dioxide CO₂ 4.5 from Linde is a high-purity gas with a purity of ≥ 99.995%, supplied in pressurized cylinders for demanding laboratory, analytical, and industrial applications.Its elevated purity makes it ideal as a resonator gas for CO₂ lasers, as well as an operational and calibration gas in analytical chemistry, where low impurity levels and high stability are essential. It is also widely used in semiconductor manufacturing, metallurgy, chemical processing, healthcare, and research.CO₂ 4.5 represents an optimal balance between high purity and cost efficiency across a broad range of applications.<h4>Key Features</h4><ul><li>Gas purity ≥ 99.995%</li><li>Suitable for CO₂ laser applications</li><li>Stable composition for analytical use</li><li>Low impurity levels</li><li>Supplied in pressurized cylinders</li><li>Broad laboratory and industrial applicability</li></ul><h4>Technical Specifications</h4><ul><li>Gas: carbon dioxide (CO₂)</li><li>Purity: ≥ 99.995% (4.5 grade)</li><li>Supply form: pressurized gas cylinder</li><li>Other available grades:<ul><li>CO₂ for welding</li><li>CO₂ 3.0</li><li>CO₂ 4.8</li><li>CO₂ 5.3</li><li>CO₂ for SFE/SFC</li></ul></li></ul><h4>Applications</h4><ul><li>Resonator gas for CO₂ lasers</li><li>Operational and calibration gas in analytics</li><li>Gas chromatography and laboratory analysis</li><li>Semiconductor manufacturing</li><li>Metallurgy and chemical industry</li><li>Healthcare and research</li></ul>

Linde Methane 2.5 – Gas Cylinder

Linde Methane 2.5 (≥99.5%) gas cylinder for metallurgy, microelectronics, and measurement applications. Reliable fuel and process gas.

Methane 2.5 from Linde is a technical-grade gas with a purity of ≥ 99.5%, supplied in pressurized cylinders for a wide range of industrial and laboratory applications.Due to its properties, methane is an ideal fuel and process gas, particularly for thermal treatments and the creation of controlled atmospheres in metallurgy. It is also used in electronics, microelectronics, and various analytical and physical measurement techniques.Methane 2.5 provides a cost-effective and reliable solution for applications where ultra-high purity is not required but consistent performance is essential.<h4>Key Features</h4><ul><li>Gas purity ≥ 99.5%</li><li>Suitable as fuel and process gas</li><li>Stable composition for industrial use</li><li>Cost-effective solution</li><li>Supplied in pressurized cylinders</li><li>Broad range of applications</li></ul><h4>Technical Specifications</h4><ul><li>Gas: methane (CH₄)</li><li>Purity: ≥ 99.5% (2.5 grade)</li><li>Supply form: pressurized gas cylinder<ul><li>10 l (200 bar)</li><li>50 l (200bar)</li></ul></li></ul><h4>Applications</h4><ul><li>Metallurgy – controlled atmospheres for thermal processing</li><li>Electronics and microelectronics</li><li>Energy carrier for specialized processes (e.g., explosive surface treatment)</li><li>Standard gas for calorimetric measurements</li><li>Process gas for radioactivity measurements</li></ul>

Linde Oxygen 3.5 – Gas Cylinder

Linde Oxygen 3.5 (≥99.95%) gas cylinder for metal cutting and industrial use. Higher purity improves cutting speed and quality.

Oxygen 3.5 from Linde is a technical-grade gas with a purity of ≥ 99.95%, supplied in pressurized cylinders for industrial and technological applications.Its enhanced purity improves combustion efficiency, increases cutting speed, and enhances cut quality. This makes it ideal for laser, plasma, and oxy-fuel cutting of metals, particularly steels and sheet materials. It is also widely used in electronics, precision engineering, mechanical engineering, and in the production of vehicles, aircraft, and pressure vessels.<h4>Key Features</h4><ul><li>Gas purity ≥ 99.95%</li><li>Supports high-intensity combustion</li><li>Improves cutting speed</li><li>Enhances cut quality</li><li>Suitable for industrial applications</li><li>Supplied in pressurized cylinders</li></ul><h4>Technical Specifications</h4><ul><li>Gas: oxygen (O₂)</li><li>Purity: ≥ 99.95% (3.5 grade)</li><li>Supply form: pressurized gas cylinder<ul><li>50 l (200 bar)</li></ul></li></ul><h4>Applications</h4><ul><li>Laser cutting of metals</li><li>Plasma cutting</li><li>Oxy-fuel cutting</li><li>Electronics and precision engineering</li><li>Mechanical engineering</li><li>Manufacturing of vehicles, aircraft, and pressure vessels</li></ul>

Linde Oxygen 4.5 – Gas Cylinder

Linde Oxygen 4.5 (≥99.995%) gas cylinder for analytics, chemistry, and semiconductors. High-purity gas for laboratory and industrial applications.

Oxygen 4.5 from Linde is a high-purity gas with a purity of ≥ 99.995%, supplied in pressurized cylinders for demanding laboratory, analytical, and industrial applications.It acts as a strong oxidizing agent in chemical processes and serves as an operational gas for analytical applications. Its high purity ensures minimal contamination and reliable, reproducible results.Oxygen 4.5 is widely used in the chemical industry, semiconductor manufacturing, healthcare, and research, where stable and precise performance is required.<h4>Key Features</h4><ul><li>Gas purity ≥ 99.995%</li><li>Strong oxidizing properties</li><li>Suitable for analytical applications</li><li>Low impurity levels</li><li>Stable and reproducible performance</li><li>Supplied in pressurized cylinders</li></ul><h4>Technical Specifications</h4><ul><li>Gas: oxygen (O₂)</li><li>Purity: ≥ 99.995% (4.5 grade)</li><li>Supply form: pressurized gas cylinder<ul><li>10 L (200 bar)</li><li>50 L (200 bar)</li></ul></li></ul><h4>Applications</h4><ul><li>Chemical industry (oxidation processes)</li><li>Semiconductor manufacturing</li><li>Analytical laboratories</li><li>Healthcare</li><li>Research and development</li></ul>

Linde Oxygen 5.0 – Gas Cylinder

Linde Oxygen 5.0 (≥99.999%) gas cylinder for analytics, semiconductors, and research. Ultra-high purity for demanding applications.

Oxygen 5.0 from Linde is an ultra-high purity gas with a purity of ≥ 99.999%, supplied in pressurized cylinders for the most demanding laboratory, analytical, and industrial applications.It acts as a strong oxidizing agent in chemical processes and serves as an operational gas for analytical applications where maximum purity and minimal contamination are critical. Its quality ensures high precision and reproducibility.Oxygen 5.0 is widely used in the chemical industry, semiconductor manufacturing, healthcare, and research and development environments.<h4>Key Features</h4><ul><li>Gas purity ≥ 99.999%</li><li>Ultra-high purity for demanding applications</li><li>Strong oxidizing properties</li><li>Suitable for analytical use</li><li>Minimal contamination levels</li><li>Supplied in pressurized cylinders</li></ul><h4>Technical Specifications</h4><ul><li>Gas: oxygen (O₂)</li><li>Purity: ≥ 99.999% (5.0 grade)</li><li>Supply form: pressurized gas cylinder<ul><li>10 L (200 bar)</li><li>50 L (200 bar)</li></ul></li></ul><h4>Applications</h4><ul><li>Chemical industry (oxidation processes)</li><li>Semiconductor manufacturing</li><li>Analytical laboratories</li><li>Healthcare</li><li>Research and development</li></ul>

Linde Oxygen 6.0 – Gas Cylinder

Linde Oxygen 6.0 (≥99.9999%) gas cylinder for ultra-high purity applications in analytics, semiconductors, and research.

Oxygen 6.0 from Linde is an ultra-high purity gas with a purity of ≥ 99.9999%, supplied in pressurized cylinders for the most demanding analytical, semiconductor, and research applications.It functions as a strong oxidizing agent in chemical processes and as a high-purity operational gas for analytical use, where minimizing trace contaminants is essential. Its exceptional purity ensures maximum accuracy, stability, and reproducibility.Oxygen 6.0 is particularly suited for advanced research, microelectronics, and other applications where gas quality is a critical parameter.<h4>Key Features</h4><ul><li>Gas purity ≥ 99.9999%</li><li>Ultra-high purity for critical applications</li><li>Strong oxidizing properties</li><li>Minimal impurity levels</li><li>Suitable for analytical and semiconductor applications</li><li>Supplied in pressurized cylinders</li></ul><h4>Technical Specifications</h4><ul><li>Gas: oxygen (O₂)</li><li>Purity: ≥ 99.9999% (6.0 grade)</li><li>Supply form: pressurized gas cylinder<ul><li>10 L (200 bar)</li><li>50 L (200 bar)</li></ul></li></ul><h4>Applications</h4><ul><li>Chemical industry (high-purity oxidation processes)</li><li>Semiconductor manufacturing</li><li>Analytical laboratories</li><li>Healthcare</li><li>Research and development</li></ul>

Linde Helium 4.6 – Gas Cylinder

Linde Helium 4.6 (≥99.996%) gas cylinder for chromatography, leak detection, and industrial use. Reliable carrier and cooling gas.

Helium 4.6 from Linde is a high-purity inert gas with a purity of ≥ 99.996%, supplied in pressurized cylinders for a wide range of industrial and analytical applications.Due to its chemical inertness, low density, and excellent thermal conductivity, helium is ideal for cooling, protective atmospheres, and analytical workflows. It is widely used as a carrier gas in gas chromatography, ensuring stable separations and reproducible results.Helium 4.6 is also applied in leak detection, metallurgy, glass production, laser technologies, and medical gas mixtures.<h4>Key Features</h4><ul><li>Gas purity ≥ 99.996%</li><li>Chemically inert</li><li>Excellent thermal conductivity</li><li>Low density</li><li>Ideal carrier gas for GC</li><li>Supplied in pressurized cylinders</li></ul><h4>Technical Specifications</h4><ul><li>Gas: helium (He)</li><li>Purity: ≥ 99.996% (4.6 grade)</li><li>Supply form: pressurized gas cylinder<ul><li>10 L (200 bar)</li><li>50 L (200 bar)</li><li>50 L (300 bar)</li></ul></li></ul><h4>Applications</h4><ul><li>Shielding gas in welding</li><li>Purging in metallurgy and specialty glass production</li><li>Cooling medium in reactors</li><li>Glass fiber manufacturing</li><li>Carrier gas in gas chromatography</li><li>Laser gas mixtures (with CO₂)</li><li>Leak detection</li><li>Medical gas mixtures</li></ul>

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Confident Identification of Battery Solvent Impurities Using Complementary GC-MS Techniques