Graphite Tube for Laboratory

Graphite Tube for Laboratory Introduction

Our graphite crucibles have been tested over time to stand up to even the most difficult analysis. From the difficult-to-analyze titanium and zirconium to simpler applications like copper and steel, we always have a graphite crucible to meet your needs and quality control measures. We offer graphite for all major OEMs including LECO®, ELTRA®.

The production process of spectral graphite crucible continues to develop, and the current production process can already achieve very good product quality and meet the needs of various chemical analysis.

In addition, our laboratory graphite crucible also has good environmental protection properties, the use of the process will not cause pollution to the environment, is a green environmental protection analytical reagent.

In summary, our graphite crucible is excellent for chemical analysis, its application can not only improve the accuracy of analysis results, but also has good environmental protection properties, and has an important role in promoting the development of modern chemical analysis.

Common Laboratory Applications of Graphite Tubes:

Atomic Absorption Spectroscopy (AAS) / Graphite Furnace Atomic Absorption Spectrometry (GFAAS): This is one of the most common uses. Graphite tubes are used as the atomizer in GFAAS. A sample is placed inside the graphite tube, which is then heated to very high temperatures to vaporize and atomize the analyte. The absorption of light by the atoms is measured to determine the concentration of the analyte. Different grades of graphite (e.g., pyrolytically coated) are used to optimize performance for different elements and matrices. The tubes need to be replaced periodically as they degrade from the high temperatures and sample matrix.

High-Temperature Furnaces and Ovens: Graphite tubes can be used as heating elements in furnaces, especially for reaching very high temperatures in inert atmospheres or vacuum. They can also be used as crucibles or liners within furnaces.

Chemical Reactors: Due to its chemical resistance and high-temperature stability, graphite can be used in the construction of chemical reactors, especially for reactions involving corrosive substances or requiring high temperatures.

Electrodes: Graphite is a common electrode material in electrochemistry, especially when a large surface area or high current density is needed.

Thermal Analysis: Graphite crucibles and sample holders are used in techniques like Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA) for high-temperature measurements.

Vacuum Systems: Graphite can be used as a material in vacuum systems due to its low outgassing properties (if properly baked out). It's used in baffles, heat shields, and other components.

Research and Development: Graphite tubes can be used in custom-built experimental setups where high temperature stability, chemical resistance, or electrical conductivity are required.

Metallurgy: Graphite is used in the production of metals, including steel, aluminum, and other alloys. While typically not in tube form, graphite powders are used. Graphite tubes could potentially be used as liners in specific metallurgical processes.

Important Considerations When Selecting and Using Graphite Tubes:

Purity: The purity of the graphite is crucial, especially for sensitive analytical techniques like AAS. Impurities can interfere with measurements or contaminate samples. Look for high-purity graphite grades.

Density and Porosity: The density and porosity of the graphite affect its thermal conductivity, strength, and chemical permeability. Denser, less porous graphite is generally preferred for applications requiring high strength and chemical resistance.

Grade of Graphite: Different grades of graphite have different properties. For example, pyrolytic graphite has a highly ordered structure and is used in GFAAS to reduce interferences. Isostatic graphite has uniform properties in all directions.

Dimensions: Select the appropriate dimensions (length, diameter, wall thickness) for your specific application.

Atmosphere: Graphite can oxidize at high temperatures in the presence of oxygen. Therefore, it's often used in inert atmospheres (e.g., argon, nitrogen) or vacuum.

Machining and Handling: Graphite is relatively brittle and can be easily damaged. Handle it carefully and use appropriate machining techniques if modifications are needed.

Cleaning: Follow appropriate cleaning procedures to remove contaminants from the graphite surface. Avoid harsh chemicals that could react with the graphite. Heating in a vacuum or inert atmosphere is often used for degassing.

Safety: Always wear appropriate personal protective equipment (PPE) when handling graphite, including gloves, safety glasses, and a dust mask, especially when machining or grinding it. Graphite dust can be a respiratory irritant.

Cost: Graphite can vary significantly in price depending on its purity, grade, and dimensions. Consider your budget and application requirements when selecting a graphite tube.

Manufacturer/Supplier: Choose a reputable supplier of laboratory-grade graphite products. They can provide technical support and ensure the quality of their products.