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Phosphor Bronze – An Overview

An Overview of Phosphor Bronze

Phosphor bronze is an alloy composed of copper, tin, and phosphorus. It is a strong, ductile material with a wide range of applications in industrial and commercial settings. Let’s take a deeper look at this versatile metal alloy’s composition, density, melting point, specifications, and magnetic properties.

Composition & Characteristics

Phosphor bronze is made up of 91-98% copper, with the remainder consisting of tin and phosphorus. The precise amounts of these components can vary depending on the desired properties – for instance, increasing the amount of phosphorus will make the alloy more malleable while reducing its strength. As such, phosphor bronze alloys are tailored to specific customer requirements to meet their needs and expectations.

Density & Melting Point

The density of phosphor bronze varies depending on its exact composition – it can range from 8.1 g/cm3 to 8.7 g/cm3. Its melting point also depends on its composition; however, it generally ranges from 900-1000°C (1650-1832°F). This high melting point makes phosphor bronze useful for applications where higher temperatures are involved – such as soldering or welding – as it won’t melt during the process like other materials might.

Specifications & Applications

Phosphor bronze has excellent electrical conductivity due to its high copper content, making it highly resistant to corrosion from saltwater and other contaminants in the air or water. Its strength and ductility also make it suitable for various industrial applications, including springs, contacts for electrical switches and connectors, bearings for engines and turbines, fasteners such as nuts, bolts & screws, and electrical components like resistor grids & ringing caps.

Is Phosphor Bronze Magnetic?

No – phosphor bronze is non-magnetic due to its low iron content, which prevents it from being affected by magnetic fields. This property makes it ideal for use in electronic equipment where magnetic interference could cause problems with accuracy or performance.


In conclusion, phosphor bronze is an incredibly versatile alloy composed primarily of copper with smaller amounts of tin and phosphorus added according to customer requirements. Its high melting point makes it suitable for use in applications involving elevated temperatures, while its non-magnetic properties make it useful for electronics applications where accuracy is key. Thanks to these characteristics, along with its strength and resistance to corrosion from saltwater or other contaminants in the air or water, phosphor bronze can be used in many different industries around the world for a variety of purposes ranging from simple nuts & bolts through to complex turbine bearings or resistor grids & ringing caps! Intended Audience: Engineers interested in learning about phosphor bronzes’ properties and potential uses in industry/manufacturing applications.


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