Archive: Apr 2024

ACR Copper Coil Tubing

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Air conditioning and refrigeration (ACR) copper tubing is commonly used in heating, ventilation, and air conditioning (HVAC) systems. It is utilized for transporting refrigerants — such as R-410A and R-22 — throughout the system to facilitate the cooling or refrigeration process. This tubing technique is preferred for its ability to efficiently conduct heat, which is crucial for effective ACR operation.

In this article, we will discuss the characteristics and applications of this copper coil tubing method. We will also look at the different types of ACR copper coils.

Unique Characteristics of ACR Copper Coils

The following characteristics make ACR copper coils the go-to materials for those seeking efficient and durable solutions for air conditioning and refrigeration systems:


ACR copper coils are renowned for compatibility with refrigerants commonly used in air conditioning and refrigeration systems. This ensures that the coils can accommodate various system designs and operating conditions. It also offers reliability and performance across diverse applications in commercial and industrial settings.

Corrosion Resistance

A defining trait of ACR copper coils is their excellent corrosion resistance. They retain their integrity over time, even when exposed to harsh environmental conditions or various refrigerants. This is essential in ensuring the longevity and reliability of the components, where exposure to moisture, chemicals, and other corrosive elements is common.


ACR copper coils exhibit excellent formability, allowing them to be easily bent, shaped, and installed to suit the specific requirements of diverse applications. This flexibility is invaluable in adapting the coils to intricate system designs and optimizing space utilization and system performance. Installers also benefit from the ease of working with these coils, which enables precise customization.

Thermal Conductivity

The high thermal conductivity of ACR copper coils allows for efficient heat transfer within the system. This facilitates rapid cooling or heating of the surrounding air or refrigerant. It also contributes to the overall energy efficiency of HVAC and refrigeration (HVACR) systems, ultimately reducing operational costs and environmental impact. Moreover, it ensures consistent temperature regulation throughout the system.

Applications of ACR Copper Coil Tubing

Aside from air conditioning systems and refrigeration units, here are the most common applications of this coil tubing technique:

  • Agricultural cooling systems: The coils preserve harvested crops and maintain optimal conditions in agricultural storage facilities.
  • Automotive air conditioning: ACR copper coils are incorporated into automotive HVAC systems to ensure reliable performance and comfort for passengers.
  • Data center cooling: The coils help dissipate heat generated by servers and networking equipment, ensuring efficient operation and preventing overheating-related downtime.
  • Food and beverage systems: ACR copper coils are used in commercial refrigerators, display cases, and dispensing systems to maintain optimal storage temperatures for perishable items.
  • Medical and laboratory equipment: The coils are used in cooling units for storing vaccines, pharmaceuticals, and biological samples to ensure their integrity and efficacy.
  • Renewable energy systems: The coils facilitate heat transfer between the ground and the indoor environment in geothermal heat pumps.

Types of ACR Copper Coil Tubing

The following types of ACR copper tubing offer distinct advantages and applications:

Standard ACR Copper Tubing

Standard ACR copper tubing is the most common type used in HVACR systems. It is available in various sizes and wall thicknesses to accommodate different configuration requirements. This tubing typically meets industry standards such as ASTM B280 and is suitable for general-purpose uses.

Soft Annealed ACR Copper Tubing

Soft annealed ACR copper tubing undergoes heat treatment to improve its malleability and ease of bending. This type is highly flexible and can be easily shaped by hand or with simple bending tools. It is preferred for applications requiring tight bends or intricate configurations.

Hard-Drawn ACR Copper Tubing

Hard-drawn ACR copper tubing is manufactured through a cold-drawing process, resulting in increased tensile strength and hardness compared to soft-annealed tubing. This tubing is more rigid and maintains its shape better when subjected to external forces or pressure.

Insulated ACR Copper Tubing

Insulated ACR copper tubing features a layer of insulation material wrapped around the copper tubing to prevent condensation and minimize heat transfer. This is commonly used for refrigerant lines running through unconditioned spaces or areas with fluctuating temperatures.

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At Interstate Metal, Inc., we offer an array of metals engineered to deliver exceptional mechanical properties, guaranteeing reliability and durability across diverse applications! We also prioritize customer satisfaction by providing personalized services and expert guidance throughout selection and procurement. Moreover, our team is committed to providing comprehensive technical support and assistance.

Contact us today or request more information about our products and services!

What Is Bronze Made Of?

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Bronze, a timeless alloy renowned for its distinct properties, has played an essential role in various industries throughout history. It is a copper alloy mixed with up to 12.5% tin, along with other metals like aluminum, manganese, nickel, or zinc. Sometimes, non-metals like phosphorus or metalloids like arsenic or silicon may also be added. These additions create a range of alloys with varied properties such as hardness, strength, ductility, or machinability.

This alloy played a vital role in the Bronze Age, starting around 3500 BC in western Eurasia and India, and in China around 2000 BC. Although the Iron Age followed around 1300 BC, bronze continued to be extensively used until approximately 500 BC, despite its decline compared to modern times. Historically, artworks were commonly made from brasses a combination of copper and zinc and various compositions of bronze. Nowadays, it is still a crucial material for art, architecture, and engineering.

In this blog, we’ll explore the composition of bronze, discuss the effects of varying ratios of its components, and highlight its historical and modern significance.

What Is Bronze Made Of: Primary Composition

Bronze is an alloy that combines copper and tin. The proportions of these constituents influence the alloy’s properties, such as color, strength, and corrosion resistance.

Copper-Dominant Bronze

A higher ratio of copper in the alloy results in what is known as “red” or “pink” bronze. This composition has enhanced strength, making it ideal for structural elements and machinery components that require durability and load-bearing capacity. The hue of copper-dominant bronze ranges from warm reddish tones to deeper shades, adding to its aesthetic appeal.

Tin-Enriched Bronze

On the other hand, a higher tin content creates a bronze with a paler hue, often called “white” or “pale” bronze. This composition amplifies the alloy’s corrosion resistance, making it an excellent choice for marine applications and environments prone to oxidation. Tin’s presence also increases the alloy’s fluidity during casting, enabling intricate designs and finer details in artistic creations.

Additional Elements

Beyond copper and tin, other elements can be added to bronze to enhance its properties. Here are some of them:


Aluminum can make a stronger bronze with higher rust resistance. As a result, you get an alloy that is more resilient in high-moisture and corrosive environments. This makes it great for ship parts or structures exposed to outdoor elements.


Phosphorus improves bronze’s fluidity during casting, allowing for more intricate designs and finishing. This is useful for crafting detailed sculptures and artworks.


Like phosphorus, silicon contributes to increased fluidity, allowing bronze to flow smoothly when molded. It also reduces oxidation and rusting, making it suitable for components exposed to moisture.

Applications of Bronze

The use of bronze dates back to ancient civilizations, where it revolutionized craftsmanship and artistry. Early human societies, such as the Sumerians and Egyptians, harnessed bronze to create tools and weapons. In Greece and Rome, bronze sculptures symbolized might and artistry, while China’s dynasties used this alloy to produce ornate vessels.

Bronze’s relevance persists in modern times. Sculptors and artists continue to employ this alloy for its ability to capture intricate details and textures. Architects also utilize it for ornamental and structural builds that exude elegance and durability.

In the music industry, bronze alloys are used to create instruments like bells and cymbals, contributing to their rich, unique tones. Meanwhile, marine and engineering sectors rely on their resistance to corrosion in harsh environments.

Get Quality Bronze From Interstate Metal

Looking for a trusted supplier of exceptional bronze materials? Look no further than Interstate Metal! With over 3 decades of industry experience, we are your trusted experts in bronze, brass, copper, and aluminum products. Our products range from bars to press fittings, and we offer metal forging, saw cutting, and more services!

Explore our comprehensive catalog to find the ideal bronze grade for your project’s requirements. You can also submit a query to learn more about our products or inquire about customized projects. Our team of experts is here to help you make the most informed decisions for your ventures.