Back to articles
June 07, 2023

What HPA is used for?


High Purity Alumina (HPA) has become a critical material in the modern technological landscape. Its rise to prominence was primarily driven by the demand for LED (Light Emitting Diode) lighting systems in the early 2000s. As the availability of HPA increased, its application expanded into various fields, including rechargeable batteries, tough glass for consumer electronics, high-performance computer chips, and medical uses. Let's delve deeper into each of these applications.

Rechargeable Batteries

HPA plays a pivotal role in the development of rechargeable batteries, particularly lithium-ion batteries, which are ubiquitous in our daily lives, powering everything from smartphones to electric vehicles. The incorporation of HPA into these batteries is primarily through ceramic-coated separators. These separators lie between the anode and cathode within the battery and are crucial for safety and performance.

The ceramic coating provides thermal stability and resistance to the separator. This enhancement is vital as it reduces the risk of thermal runaway – a dangerous increase in temperature that can lead to battery fires or explosions. Moreover, HPA-based coatings can improve the battery's life cycle by preventing the degradation of the separator, thus ensuring a longer and more reliable performance.

Tough Glass

One of the more visible applications of HPA is in the form of sapphire glass, sometimes referred to as 'ceramic glass'. This material is widely used in high-end watch faces and smartphone screens. Sapphire glass is not actually glass but a transparent form of aluminum oxide (Al2O3) – the primary component of HPA.

Its popularity in these applications stems from its remarkable hardness – second only to diamond – and its excellent scratch resistance. This makes it an ideal material for devices that are subject to daily wear and tear. The clarity and durability of sapphire glass also make it suitable for covering camera lenses and fingerprint scanners, where precision and protection are paramount.

Future Technology

HPA is set to be a cornerstone in the development of future technology, particularly in the semiconductor industry. It serves as a substrate for high-performance computer chips. Its thermal stability, electrical insulation properties, and resistance to corrosion make it an ideal base material for semiconductor wafers.

As computer chips continue to shrink in size but grow in complexity and power, the demand for efficient heat dissipation increases. HPA's ability to withstand high temperatures without degrading makes it a promising material for supporting these advancements.

Medical Applications

In the medical field, HPA finds its use in creating inert coatings on medical implants. The bio-inertness of HPA is critical in medical applications, as it ensures that the implants do not react adversely with the human body. This property is particularly important for implants that remain in the body for extended periods, such as hip replacements or dental implants.

HPA coatings can reduce wear and tear on the implant, extend its lifespan, and minimize the risk of inflammation or rejection by the body. Its use in medical implants represents a significant advancement in biomedical engineering, offering patients safer and more reliable treatment options.


The widespread adoption of HPA in various industries underscores its versatility and importance in contemporary technology and medical science. From powering our portable devices to keeping our wristwatches scratch-free, and from enabling the next generation of computer chips to ensuring the safety of medical implants, HPA's role is deeply ingrained in many aspects of modern life. As technology continues to evolve, it's likely that we will see even more innovative uses for this remarkable material, further solidifying its status as a cornerstone of modern material science.