What is UL 321?

UL 321 is a well-known industry standard for fire-resistant hoses. In this article, we will take an in-depth look at UL 321 and explore its technical specifications, applications, and benefits.

Technical Specifications of UL 321

UL 321 is a type of flexible metal hose that is designed to withstand high temperatures and provide protection against fire hazards. It is constructed using a stainless steel outer braid with an inner liner made of Teflon material. This construction ensures exceptional heat resistance and prevents the leakage of gases or fluids.

The hose has a maximum working pressure of 500 psi and can withstand temperatures ranging from -65°F to 450°F (-54°C to 232°C). It meets the requirements of the Underwriters Laboratories (UL) Standard 2175, which certifies its fire-resistance properties.

Applications of UL 321

UL 321 hoses are widely used in various industries where high-temperature operations and fire safety are crucial. Some common applications include:

Industrial furnaces and ovens

Chemical processing plants

Power generation facilities

Aerospace and aviation systems

Automotive manufacturing

These hoses are ideal for conveying a wide range of materials such as air, steam, gases, and liquids. They offer reliable performance and ensure the integrity and safety of critical processes.

Benefits of Using UL 321 Hoses

Choosing UL 321 hoses presents several advantages:

Fire Resistance: UL 321 hoses are designed to resist flames and prevent fire spread. They provide crucial protection in applications where fire hazards are a concern.

Temperature Resistance: With their exceptional temperature resistance, UL 321 hoses can handle extreme heat or cold conditions without compromising performance.

Chemical Compatibility: The Teflon inner liner of UL 321 hoses offers excellent chemical resistance, making them suitable for conveying a wide range of aggressive and corrosive substances.

Durability: These hoses are built to last. Their stainless steel construction ensures durability and longevity even in demanding environments.

Flexibility: UL 321 hoses are highly flexible, allowing for easy installation and routing around obstacles. This flexibility reduces the risk of hose failure and enhances overall system efficiency.

In conclusion, UL 321 is a reliable and industry-trusted fire-resistant hose that offers remarkable heat resistance, chemical compatibility, and durability. Its technical specifications make it suitable for a wide range of high-temperature applications across various industries. By choosing UL 321 hoses, businesses can ensure the safety and efficiency of critical processes while meeting stringent fire safety standards.