Interlock Hoses - Packed with Asbestos Yarn

INTERLOCK HOSE (SS & GI), packed with asbestos yarn is a specialized metallic flexible hose designed for high-temperature and thermal-insulation applications. The hose is constructed from interlocking metal strips, usually made of galvanized iron or stainless steel, which provide flexibility, mechanical strength, and resistance to vibration. The internal packing of asbestos yarn acts as an effective heat-resistant and insulating medium, minimizing heat transfer through the hose wall and improving temperature containment.

This type of hose is commonly used for hot air, exhaust gases, furnace connections, boiler vents, and industrial heating systems, where temperatures exceed the limits of standard hoses. The asbestos packing also helps reduce noise, prevent gas leakage, and improve pressure stability under operating conditions. Due to its robust construction, the hose can withstand thermal expansion, mechanical stress, and harsh industrial environments

Asbestos-packed interlock hoses were widely used because of asbestos’s excellent fire resistance and durability. However, due to health and safety concerns associated with asbestos exposure, their use is now restricted or regulated in many regions, and safer alternative packing materials are often recommended. Proper handling, installation, and compliance with local regulations are essential when dealing with this type of hose.

Applications of interlock hose packed with asbestos yarn:

• Hot air and exhaust gas transfer

• Furnace and boiler connections

• Thermal insulation lines in steel and metal plants

• Foundries and glass industries

• Kiln and oven venting systems

• High-temperature ducting applications

• Power plants for heat-resistant flexible connections

• Industrial heating and drying equipment

• Areas requiring vibration absorption at high temperatures

WHY PACKED INTERLOCKED HOSE

An interlock hose packed with asbestos yarn is used instead of an unpacked interlock hose because it offers several added performance benefits, especially in high-temperature applications:

Better heat insulation – the asbestos yarn reduces heat transfer through the hose wall, making it safer to handle and protecting nearby equipment.
Higher temperature resistance – packing allows the hose to handle much higher operating temperatures than an unpacked hose.
Reduced leakage – the yarn packing helps seal the interlocks, minimizing gas or hot air leakage.

Improved pressure stability – packing supports the hose internally, helping it perform better under moderate pressure.

Noise and vibration reduction – the internal packing dampens vibration and sound from flowing hot gases.

Extended service life in severe heat conditions compared to unpacked hoses.

Because of these advantages, packed interlock hoses are preferred for furnaces, boilers, kilns, and exhaust systems, while unpacked interlock hoses are typically used for lower-temperature air or gas applications.