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Converters & Calculators
Different Purity Levels of Alumina Explained
Introduction
Alumina serves as a base material in various industries. It is available in multiple grades, each fulfilling distinct requirements. This article outlines the differences in straightforward language.
Technical Grade Alumina (Low Purity Alumina)
Technical grade alumina has a purity of 90-95%. It is suitable for uncomplicated applications where high purity is not necessary. Industries such as cement and basic ceramics utilise this grade as its impurity levels do not hinder its application.
Industrial Grade Alumina (Medium Purity Alumina)
Industrial grade alumina possesses a purity level ranging from 95% to 99%. This grade adheres to higher standards compared to technical grade and is used in applications requiring enhanced performance. For example, it is employed in catalysis in chemical reactions and for metal coatings. It also finds use in substrate production within electronics, where higher purity guarantees improved stability.
High Purity Alumina (High Purity Alumina)
High purity alumina, also referred to as high purity alumina, exceeds 99.5% purity. It is widely employed in electronics and specialised ceramics applications. Common usages include LED substrates and laser ceramics, where its low impurity levels provide the stability required in sensitive applications. Research and production laboratories predominantly utilise this grade for its consistency and performance.
Ultra High Purity Alumina
Ultra high purity alumina represents the highest quality available, with purity levels of 99.9% or greater. It is essential in areas such as semiconductor manufacturing and optical technologies. The minimal impurities present do not impair its performance, making it suitable for environments where even trace impurities could be detrimental. High-tech firms and high-quality ceramics producers depend on it when stringent standards are required.
Comparison Table
The following table presents a comparison of the different grades of alumina:
|
Grade |
Typical Purity |
Applications |
Common Examples |
|
Technical Grade Alumina |
90% - 95% |
Refractories, basic ceramics, cement |
Basic industrial ceramics, cements |
|
Industrial Grade Alumina |
95% - 99% |
Catalysts, protective coatings, certain electronics |
Chemical catalysts, substrate materials |
|
High Purity Alumina |
99.5% and above |
LED substrates, laser ceramics, high-end ceramics |
Advanced electronic components, lasers |
|
Ultra High Purity Alumina |
99.9% and above |
Semiconductor manufacturing, optical components |
Optics, precision semiconductors |
For further ceramic materials, please visit Stanford Advanced Materials (SAM).
Conclusion
The differences in alumina purity levels have been outlined. Each grade serves a specific purpose. Technical grade is appropriate for general industrial use. Industrial grade meets medium purity requirements. High purity is reserved for high technology applications. Ultra high purity is applicable in the most stringent contexts. Select the grade based on the specific needs of your project.
Frequently Asked Questions
F: What is the primary use of technical grade alumina?
Q: It is utilised in refractories and cement where high purity is not essential.
F: What are the applications of industrial grade alumina?
Q: It is incorporated in catalysts and protective coatings where a balance of cost and purity is required.
F: Why is ultra high purity alumina used in semiconductors?
Q: The low impurity levels ensure the reliability and performance needed for semiconductor production.
Chin Trento
