Zirconium – Zirconium Metal

7 Interesting Facts to Know About Zirconium

Zirconium, a silvery-white transition metal, might not be a household name like gold or iron, but it is an essential element in a wide range of industries. From its role in aerospace to its applications in dentistry, zirconium offers a unique blend of properties that make it both fascinating and highly useful. Here’s a deep dive into the world of zirconium.

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1. The Basics of Zirconium

Zirconium, with the chemical symbol Zr and atomic number 40, is a member of the transition metals in the periodic table. Its name originates from the Arabic word “zargun,” meaning “gold-colored,” which refers to the zircon gemstones that contain zirconium. Despite its name’s connection to gold, zirconium itself is typically silver-gray.

– Atomic Weight: 91.22

– Melting Point: 1,855°C (3,371°F)

– Boiling Point: 4,409°C (7,968°F)

Zirconium is abundant in the Earth’s crust, ranking as the 20th most common element. However, it is not found in its pure form; instead, it is extracted from minerals like zircon (ZrSiO₄) and baddeleyite (ZrO₂).

2. Its Unique Properties

Zr is known for its remarkable physical and chemical properties, which make it invaluable in numerous applications:

– High Corrosion Resistance: Zr resists corrosion by acids, alkalis, and seawater, making it ideal for environments where durability is critical.

– Heat Resistance: It has a high melting point, making it suitable for high-temperature applications.

– Low Neutron Absorption: This property is particularly significant in nuclear reactors, where zirconium is used to contain nuclear fuel.

– Biocompatibility: Zr is non-toxic and hypoallergenic, which is why it’s used in medical and dental implants.

3. Uses of Zirconium

A. Nuclear Industry

Zirconium’s low neutron absorption cross-section makes it indispensable in the nuclear industry. It is used to manufacture cladding for nuclear fuel rods, ensuring the safe containment of radioactive materials while allowing neutrons to pass through.

B. Aerospace and Defense

Thanks to its strength and heat resistance, it is used in jet engines, spacecraft, and military applications. Its ability to withstand extreme conditions makes it a critical material for advanced engineering.

C. Dental Applications

Zirconium oxide, commonly known as zirconia, is a popular material for dental crowns and bridges. Its biocompatibility, durability, and aesthetic resemblance to natural teeth make it a preferred choice in modern dentistry.

D. Jewelry and Gemstones

The gemstone zircon, which contains zirconium, is often used as a diamond substitute due to its brilliance and clarity. Cubic zirconia, a synthetic material made from zirconium dioxide, is a popular, affordable alternative to diamonds.

E. Industrial Applications

Zr is used in manufacturing heat exchangers, pumps, and valves for chemical processing due to its resistance to corrosion. Additionally, it is employed in making ceramics and refractories for high-temperature processes.

4. Historical Background

Zirconium was first isolated in 1824 by the Swedish chemist Jöns Jakob Berzelius, who used potassium to reduce zirconium tetrachloride. However, its applications remained limited until the 20th century, when its unique properties were fully understood. The development of nuclear technology during World War II significantly increased interest in zirconium, leading to its widespread use in reactors.

5. Fun Facts About Zirconium

– Fireworks Sparkle: Zr is used in pyrotechnics to create brilliant flashes of light. Its high reactivity with oxygen makes it perfect for generating sparks.

– Space Exploration: Zirconium alloys are used in spacecraft construction due to their ability to withstand extreme temperatures and stress.

– Ancient Origins: Zircon, the mineral from which zirconium is extracted, is one of the oldest materials on Earth. Some zircon crystals have been dated to over 4.4 billion years old.

– Non-Magnetic Nature: Zr is non-magnetic, making it useful in devices and environments where magnetism could interfere with operations.

– Dental Perfection: Zirconia dental implants are so strong that they are often referred to as “ceramic steel.”

Conclusion

Zirconium’s unique properties and diverse applications make it an unsung hero of modern science and industry. From its role in enabling safe nuclear energy to its contribution to beautiful dental restorations and sparkling jewelry, zirconium is a fascinating element that continues to shape our world. As research and technology advance, zirconium’s importance is only set to grow, solidifying its place as a material of the future. For more information, please visit Advanced Refractory Metals (ARM).

Reference:

[1]

Zirconium. (2024, October 30). In Wikipedia. https://en.wikipedia.org/wiki/Zirconium

Why Is Zirconium Expensive? Factors Driving Its Cost

Introduction

Zirconium is a metal that finds use in a variety of high-tech and industrial applications due to its unique properties. The cost of zirconium can be attributed to several factors, including its extraction, processing, and demand in specialized industries. Here are the primary reasons why zirconium is expensive:

1. Extraction and Processing Costs

a. Mining and Refining:

Zirconium is primarily obtained from the mineral zircon (ZrSiO4). Extracting zirconium from zircon involves complex and energy-intensive processes. Zircon is typically mined from mineral sands, and the extraction process involves separating zircon from other heavy minerals, which requires substantial effort and technology. For example, in 2021, the global production of zirconium mineral concentrates was estimated at around 1.3 million metric tons, primarily sourced from Australia and South Africa.

b. Purification:

Purifying zirconium to achieve the necessary level of purity for industrial use is a complex process. Impurities such as hafnium, which often occurs alongside zirconium, need to be separated. This separation process is intricate and costly because hafnium has similar chemical properties to zirconium. The Kroll process, commonly used to purify zirconium, involves reducing zirconium tetrachloride (ZrCl4) with magnesium, which is both energy-intensive and costly.

2. High Demand in Specialized Applications

a. Nuclear Industry:

Zirconium is highly valued in the nuclear industry due to its low absorption cross-section for thermal neutrons, which makes it ideal for cladding nuclear fuel rods. The stringent quality and purity requirements for zirconium used in nuclear reactors drive up its cost. The global market for nuclear-grade zirconium was valued at approximately $300 million in 2022, reflecting its critical role in nuclear energy production.

b. Aerospace and Military:

In aerospace and military applications, zirconium alloys are prized for their high strength, corrosion resistance, and ability to withstand extreme temperatures. For instance, zirconium alloys are used in jet engines and missile components, where performance under high-stress conditions is essential. The aerospace sector alone accounted for about 15% of the global zirconium market in 2022.

c. Chemical Processing:

Zirconium is used in chemical processing equipment due to its resistance to corrosion by acids, alkalis, and seawater. This specialized use in harsh environments adds to the demand and cost of high-purity zirconium. The chemical industry’s demand for zirconium is expected to grow at a CAGR of 4.5% from 2023 to 2030, highlighting its importance in this sector.

3. Limited Supply and Geopolitical Factors

a. Geographical Distribution:

Zirconium resources are geographically concentrated, with significant deposits found in Australia, South Africa, and the United States. Limited supply from these regions can lead to supply constraints, impacting prices. For example, Australia alone accounted for over 40% of the world’s zircon production in 2021.

b. Geopolitical Risks:

The mining and export of zirconium can be affected by geopolitical factors, including trade policies, tariffs, and political instability in zirconium-producing regions. These risks can contribute to price volatility and higher costs. In 2020, trade tensions between major zirconium producers and consumers led to a temporary spike in prices.

4. Technological and Production Challenges

a. Advanced Manufacturing:

Producing high-purity zirconium and zirconium alloys requires advanced manufacturing technologies and stringent quality control measures. The investment in technology and adherence to high standards add to production costs.

b. Research and Development:

Continuous research and development to improve zirconium extraction, processing, and applications incur significant costs. These costs are often passed on to consumers, contributing to the overall expense of zirconium products. The global R&D expenditure on zirconium-related technologies was estimated at $50 million in 2022.

5. Environmental and Regulatory Compliance

a. Environmental Regulations:

Mining and processing zirconium must comply with stringent environmental regulations to minimize the impact on the environment. Adhering to these regulations requires investment in sustainable practices and technologies, which adds to the cost.

b. Health and Safety:

Ensuring the health and safety of workers involved in the mining and processing of zirconium is crucial. Implementing safety measures and protocols incurs additional costs, contributing to the overall expense of zirconium. Companies in the zirconium industry often follow strict health and safety standards, further driving up production costs.

Conclusion

The high cost of zirconium can be attributed to its complex extraction and purification processes, high demand in specialized and critical applications, limited supply, geopolitical factors, technological challenges, and stringent environmental and safety regulations. These factors collectively make zirconium an expensive but essential material in various high-tech and industrial sectors. Understanding these dynamics helps appreciate the value and significance of zirconium in modern technology and industry. For more information, please check Advanced Refractory Metals (ARM).

Zirconium and Hafnium: Two Intriguing Elements

Introduction

Zirconium and hafnium nestle among the transition metals and share a tale of intertwined properties. They are often found together in nature due to their chemical similarity. They also possess distinct characteristics, so they become essential in various industrial, scientific, and technological applications.

Let’s have a detailed discussion about their features and uses in this article. Hope that you can have a better understanding.

Zirconium: A Versatile Metal with Various Uses

Zirconium is a lustrous, gray-white, strong transition metal. It’s highly resistant to corrosion, making it valuable in nuclear reactors and chemical processing. It also finds uses in alloys, ceramics, and even as a gemstone substitute.

Zirconium has many applications. Here are some notable ones:

Its primary use is in the realm of nuclear technology. Its ability to withstand extreme temperatures, corrosion, and irradiation makes it an essential material in nuclear reactors. It serves as a cladding material for fuel rods. It can withstand harsh reactor environments.
Besides, zirconium’s uses extend to other industries. Its compounds, notably zirconium dioxide or zirconia, find widespread use in ceramic applications. For instance, it is applied to make high-performance ceramics used in dental crowns, hip replacements, and other medical implants.
Zirconium also plays a crucial role in the aerospace industry. Zr contributes to the manufacture of jet engine parts because their heat resistance and strength are highly prized.

Hafnium: The Elemental Twin with Unique Properties

Closely related to zirconium, hafnium shares numerous similarities. It also possesses distinct attributes that set it apart. Hafnium is notable for its high affinity for oxygen. Thus, it finds uses in creating vacuum tubes and plasma-cutting torches.

One of the most intriguing aspects of hafnium is its application in the field of microelectronics.

Hafnium dioxide has a high dielectric constant and excellent insulating properties. Thus, it has emerged as a critical component in modern semiconductor technology.
Also, it is used as a gate insulator. These advanced devices enhance the performance of integrated circuits.

The Zirconium-Hafnium Interplay

The symbiotic relationship between zirconium and hafnium emerges from their shared origins in nature. Zirconium ores often contain varying concentrations of hafnium. So, their separation is a challenging task since they have chemical similarities and nearly identical atomic radii.

The strategic extraction and purification of hafnium from zirconium are essential to access high-purity hafnium for specialized applications. That’s especially useful in the semiconductor industry because even minute impurities can significantly impact device performance.

Related reading: Separation of Zirconium and Hafnium

Future Prospects and Advancements

As technology continues to advance, the synergistic potential of zirconium and hafnium continues to expand. Research and development efforts focus on enhancing their properties, exploring novel alloys, and optimizing manufacturing techniques to meet evolving industrial demands. The quest for materials capable of withstanding extreme conditions in aerospace, energy, and healthcare sectors fuels ongoing exploration into the applications of these elements.

Conclusion

Zirconium and hafnium are bonded through their shared presence in ores and their parallel yet distinct properties. They stand as integral elements in the tapestry of modern technology and industry. Their diverse uses range from nuclear reactors to semiconductor development and medical advancements. These elements showcase their prowess across a spectrum of applications.

For over two decades, Stanford Advanced Materials (SAM) has been a trusted source. We deliver top-notch, high-purity zirconium products tailored to our clients’ precise requirements. SAM offers quality pure zirconium and zirconium alloy rods at competitive prices. Customization is also welcome. For more information, please check our homepage.

Zirconium’s Biocompatibility and Medical Applications

Introduction

In the ever-evolving landscape of medical innovation, zirconium emerges as an unsung hero with unique biocompatibility. This article explores the profound impact of zirconium’s biocompatibility on the realm of medical applications. Hope that you can have a deeper understanding of zirconium’s properties and medical uses.

Zirconium’s Biocompatibility

Most importantly, zirconium has become an ideal choice in medical science for its remarkable biocompatibility. That is to say, zirconium can coexist with living tissues without triggering adverse reactions or causing harm.

Zr also exhibits excellent corrosion resistance and a variety of impressive features.

Corrosion Resistance: Zirconium and its alloys exhibit great corrosion resistance. Such resistance prevents the material from degrading in the body’s corrosive environment. It also ensures the implant’s structural integrity over time.
Inertness: Zr does not with bodily fluids and tissues. This inertness reduces the risk of adverse reactions such as inflammation or rejection.
Low Allergic Risks: Besides, zirconium is less likely to cause allergic reactions compared to other metals.
Aesthetic Benefits: Zirconium products in dentistry offer aesthetic advantages. These products can mimic the natural appearance of teeth. They can provide patients with aesthetically pleasing dental restorations as well.
Versatile Processing: Zr’s versatility in processing allows for the fabrication of complex shapes and structures. This flexibility in manufacturing enables the creation of tailored implants that suit individual patient needs.

Medical Applications

Zirconium possesses remarkable biocompatibility, mechanical properties, and resistance to corrosion. Therefore, it has become a prime candidate for various medical applications.

Zirconium in Medical Implants

Dental Implants:

The primary use of zirconium is in medical implants, especially in dental implants.

First, Zr stands out for corrosion resistance. Second, it does not have a metallic taste. These features make it an appealing alternative to traditional metal-based dental materials. Moreover, zirconium implants have a reduced risk of allergic reactions.

Orthopedic Implants:

Beyond dentistry, zirconium-based orthopedic implants have also carved a niche.

This material reduces the risk of adverse reactions and facilitates better integration with bone tissues. This significantly improves patient outcomes in orthopedic surgeries. And it offers a sturdy yet biologically compatible solution for joint replacements and bone repairs.

Zirconium in Medical Instruments

Zirconium’s biocompatibility extends beyond implants to medical instruments and devices.

The Zirconium is non-reactive with body tissues. So it is an attractive choice for surgical instruments. Zirconium-based instruments offer durability and sterilization compatibility. Meanwhile, these products minimize the risks of tissue irritation or inflammation during medical procedures.

Exploring Biocompatible Zirconium Coatings

Innovations in biomedical engineering have led to the exploration of zirconium coatings on implants and medical devices. These coatings with biocompatibility serve as protective layers. Such coatings reduce wear and corrosion on implants while promoting better integration with surrounding tissues.

Zirconium’s Role in Biomedical Research

Zr plays a pivotal role in medical research and diagnostics as well. It serves as a contrast agent or imaging agent in medical imaging techniques, such as MRI or CT scans. Zirconium-based contrast agents offer enhanced imaging quality while ensuring minimal interference with the body’s physiological processes.

Conclusion

In a word, zirconium’s inherent biocompatibility unveils a world of possibilities in medical applications. Such applications range from implants to instruments and diagnostic tools. As research and innovation continue to unfold, with biocompatibility, zirconium is going to unveil safer, more durable, and more effective medical solutions.

Stanford Advanced Materials (SAM) is a leading supplier of top-grade zirconium rods, plates, powders, and other quality zirconium products. We also offer exceptional customer service and offer customized products. Send us an inquiry if you are interested.

Reference:

[1] D. M. K. (2014). 3D Printing in Medicine. https://www.sciencedirect.com/book/9780081007174/3d-printing-in-medicine

What Do You Know About Zirconium And Zirconium Alloys?

Compared with traditional iron, copper, nickel, and other metal elements, zirconium has a lower density and smaller thermal expansion coefficient. In addition, zirconium has a low thermal neutron absorption cross-section (only 0.18×10-28 m2) and good corrosion resistance, which makes zirconium and zirconium alloys have a wide range of applications in the nuclear industry, aerospace and other special fields.

Zirconium and its alloys have been widely used as cladding materials in nuclear reactors. Zirconium and its alloys reflect neutrons back into the reactor more efficiently than stainless steel, greatly saving uranium fuel; Zirconium alloy has good corrosion resistance at high temperature and high-pressure steam of 300 ~ 400 ℃, which also makes the reactor have a long service life. Therefore, zirconium is regarded as the first metal in the atomic age.

Development status of zirconium and its alloys

Zirconium, which is found in the earth’s crust at about 220 g /t, ranks 20th, ahead of other common metals such as copper, nickel, lead, and cobalt. Initially, zirconium alloys were mainly used as cladding materials in the nuclear industry. In recent decades, zirconium alloys have been widely used in the chemical industry, medical industry, and some special fields.

Zirconium alloy for nuclear use

Zirconium alloys have been widely used in the nuclear industry because of their very low thermal neutron absorption cross-section and good resistance to high temperature and pressure corrosion. France, the United States, Germany, and Russia have developed a series of zirconium alloys for nuclear use. At present, Zr-2, Zr-4, Zr2.5nb and ZIRLO, E635, M5, and NDA zirconium alloys have been successfully applied in the nuclear industry. These newly developed zirconium alloys have lower radiation creep properties and better resistance to iodine stress corrosion. In addition, they are able to meet the requirements of high burnup of the fuel assemblies, increasing the service life of the assemblies to 30 years.

Corrosion-resistant zirconium alloy

Zirconium has excellent corrosion resistance against most organic acids, inorganic acids, strong alkalis, and some molten salts. Therefore, zirconium can be used to improve the service life of some key components in corrosive environments. Another way to improve the corrosion resistance of alloy parts is surface pretreatment. In industry, zirconium is placed in high-temperature air to obtain a dense oxide film, so as to improve the corrosion resistance and erosion resistance of zirconium and its alloys. The results show that the corrosion rate of zirconium treated by surface oxidation in sulfuric acid medium is only 5% of that of pure zirconium, but the erosion resistance is increased by twice.

At present, zirconium is widely used as corrosion-resistant material in the chemical industry, and it has been widely used in the heat exchanger, dike washing tower, reactor, pump, valve, and corrosion medium pipeline. For example, zirconium alloys have been used to produce concentrated and hydrolyzed tubes in hydrogen peroxide production lines, while zirconium pressure reducing valves, agitators and flow meters are used in fertilizer production, sewage treatment, and dye industries.

Biomedical materials are a new high-tech material in recent years, and biomedical alloys must have good compatibility and corrosion resistance with the environment of biological fluids. Zirconium is valued by researchers for its good biocompatibility, elastic modulus similar to bone and corrosion resistance. Ti6Al4V, a titanium alloy implanted earlier in hard tissues of the human body, has an elastic modulus of nearly 110 GPa, which is much higher than the elastic modulus of 15 ~ 30 GPa of natural bones of the human body.

High-strength zirconium alloy

In the fields of space exploration, deep-sea exploration, and high-speed railway, there are often some special operating environments, such as the alternating temperature environment of -200 ~ 200 ℃, continuous space irradiation, and relative motion of structural parts, etc. Under these special circumstances, long-serving structural components are often faced with fatigue damage, dimensional instability, atomic oxygen erosion, and friction wear. At present, the structural parts used in these special fields are mainly made of 20Cr, GCr15, and other alloy steel materials, which often have problems such as poor radiation resistance, easy damage of moving parts, high density, and high cost.

Compared with traditional alloy steels, zirconium and its alloys have several important potentials:

The thermal expansion coefficient of zirconium is small and the size structure is stable, so it has the potential to produce precise structural components;
It has the potential of resisting space radiation damage;
It has the potential to resist atomic oxygen erosion;

Therefore, zirconium and its alloys are expected to adapt to unconventional environmental conditions in special fields and have the potential to be used as structural components in special environments.

Please visit http://www.samaterials.com for more information.

Rare Metals Indispensable to Modern Industries: Zirconium

Zirconium has been regarded as a precious stone since ancient times due to its rich and colorful color, playing a decorative role in human life. As people’s understanding of zirconium deepens, the application of zirconium has penetrated into every aspect of our life. For example, all kinds of buildings, ceramics, knives, ornaments, etc., as well as the military and nuclear power fields are also featured with zirconium.

Zirconium is mainly used in ceramics and refractories in the form of zirconium silicate and zirconia. Only 3 to 4 percent of zirconium ore is processed into metallic zirconium, or sponge zirconium, which is further processed into various zirconium materials. Zirconium has excellent nuclear properties because of its small thermal neutron absorption section, and the nuclear grade zirconium is used as the structural material of nuclear power aircraft carriers, nuclear submarine and civil power reactors, and the hull of the uranium fuel element. Another important use of zirconium metals is in the manufacture of alloys with excellent properties, such as aluminum zirconium alloy, copper zirconium alloy, iron zirconium alloy, and nickel zirconium alloy, zirconium tin alloy, and niobium zirconium alloy and so on.

Currently, the most used materials in the industry are zircon, while a small number of zirconium compounds and metals. Zirconium ore and mineral powder are mainly used in refractory, casting, abrasive, ceramic and electronic industries. Zirconium compounds, mainly zirconia, are used in refractories, abrasives, electronic materials, glass additives, gemstones, sensitive materials and precision ceramics.

Zirconium metals can be classified into atomic and industrial grades by use. Atomic energy grade zirconium refers to the zirconium with content of hafnium less than 0.01% in the metal, also known as hafnium zirconium or reactor-grade zirconium, which is mainly used in nuclear reactors as nuclear fuel sheathing materials and core structural materials. In the chemical industry, smelting, and other industries, zirconium does not need to be separated. Generally, zirconium containing about 2.5% of hafnium is classified as industrial-grade zirconium.

As an active metal, zirconium forms an oxide film at room temperature, which gives zirconium and its alloys excellent corrosion resistance. Moreover, zirconium also has good mechanical and heat transfer properties, as well as significant cost advantages, which makes it an excellent corrosion-resistant structural material in today’s petrochemical industry.

The zirconium applied in chemical acid-resistant equipment, military industry, and electronic industry is called industrial grade zirconium. In terms of processing difficulty and technological level, zirconium metal and its alloy products are at the top of the industrial chain.

Stanford Advanced Materials supplies high-quality zirconium products to meet our customers’ R&D and production needs. Please visit http://www.samaterials.com for more information.

What are the uses of Zirconium in the Vacuum Industry?

As a rare metal, zirconium is widely used in the fields of aerospace, military industry, nuclear reaction and atomic energy due to its remarkable corrosion resistance, extremely high melting point, ultra-high hardness, and strength.

The surface of zirconium is easy to form a glossy layer of the oxide film, so its appearance is similar to that of steel. Zirconium is resistant to corrosion but dissolves in hydrofluoric acid and aqua regia, and it can react with non-metallic elements and many metallic elements to form a solid solution at a high temperature. Zirconium has good plasticity and is easy to be processed into zirconium plate and zirconium wire. Besides that, zirconium can absorb a lot of gases such as oxygen, hydrogen, and nitrogen when heated, and can be used as hydrogen storage material. Zirconium and hafnium are two metals with similar chemical properties, which are symbiotic and contain radioactive materials.

The zirconium can absorb nitrogen violently when the temperature exceeds 900 degrees Celsius. At 200 degrees Celsius, 100 grams of metal zirconium can absorb 817 liters of hydrogen, equivalent to more than 800,000 times the hydrogen absorption capacity of iron. This characteristic of zirconium has been widely used. In the electric vacuum industry, for example, zirconium powder is coated on the surfaces of the anodes and other heated parts of the electric vacuum elements and instruments to absorb the residual gas in the vacuum tube, thus making the vacuum tube and other vacuum instruments, which have better quality and longer service life.

Zirconium can also be used as a “Vitamin” in the metallurgical industry, playing a powerful role in deoxygenation, nitrogen removal, and sulfur removal. For example, if a thousandth of zirconium is added to steel, its hardness and strength will increase dramatically. Zirconium-containing armor steel, stainless steel, and heat-resistant steel are important materials for the manufacture of defense weapons such as armored vehicles, tanks, artillery and bulletproof panels. When zirconium is mixed into copper and drawn into copper wire, its electrical conductivity does not weaken but the melting point is greatly improved, so it is very suitable to be used as a high-voltage wire. Zinc-magnesium alloys containing zirconium, which are light and high temperature resistant, are twice as strong as conventional magnesium alloys and can be used in the manufacture of jet engine components.

Zirconium alloy is a nonferrous alloy that is composed of zirconium as the matrix and other elements are added, and the main alloy elements are tin, niobium, iron, and so on. Zirconium alloys have good corrosion resistance, moderate mechanical properties, low atomic thermal neutron absorption cross-section, and good compatibility with nuclear fuel in the high-pressure water and steam of 300 ~ 400 ℃, which is mainly used as core structure material of water-cooled nuclear reactors. Besides that, zirconium has excellent corrosion resistance to a variety of acids, bases, and salts, and has a strong affinity with gases such as oxygen and nitrogen, and they are also used in the manufacture of corrosion-resistant and pharmaceutical mechanical components, as well as the non-evapotranspiration disinfectant in the electric vacuum and light bulb industries.

Stanford Advanced Materials supplies high-quality zirconium products to meet our customers’ R&D and production needs. Please visit http://www.samaterials.com for more information.