Types of Hose Core Tube Materials
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Metal cores (commonly 316L stainless steel) are a good choice for general fluid system needs. They are usually rated for temperatures between &#;325°F and 850°F or higher (&#;200°C and 454°C), making metal core tubes an exceptionally good choice for system media at extreme temperatures. Metal flexible tubing is also a good choice when there is little allowance for permeation or absorption.
Since the advent of fluoropolymers, metal core tubes are typically not chosen for highly caustic or acidic media due to issues with corrosion. It is important to note that metal cores are also not well suited for operations with repetitive movements and vibration, as they are more susceptible to fatigue failure.
Silicone cores have become the material of choice for sanitary applications due to their flexibility and cleanliness. A typical temperature range for silicone extends from &#;65°F to 500°F (&#;53°C to 315°C).
Silicone is quite absorptive&#;leading to hose contamination. If a fluid is absorbed into the walls of the core tube, it may remain there for a period of time before seeping out into the media currently within the fluid system. Steam cleaning, one of the most common sterilization methods for silicone, may also not fully remove the absorbed fluid and quickly damage a silicone core.
It is also important to note that silicone is incompatible with many common solvents and has limited chemical compatibility. Moreover, high temperatures may cause premature failure&#;causing the hose to become brittle and break down.
Fluoropolymer core tubes are very widely used and quickly replacing silicone as the material of choice for sanitary applications. PTFE, PFA, and FEP are three common fluoropolymers with a typical temperature range from &#;65°F to 450°F (&#;53°C to 230°C).
Fluoropolymer cores are the most chemically inert cores available. They are nonaging, nonstick, easy to clean and can withstand repetitive steam cleaning. Like metal cores, fluoropolymers also have a low absorption rate.
New advancements have allowed fluoropolymer cores to gain flexibility comparable to that of silicone. Bonding technology allows a fiberglass braid to be added as a layer for increased flexibility. The glue-free bonding process removes the potential for glue absorption into the core walls&#;removing the chance for contamination.
Fluoropolymer cores are more permeable than metal core hoses. If your application cannot tolerate permeation, consider specifying a less permeable core material such as metal.
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Fluid can generate electrostatic charge as it passes through fluoropolymer core tubes. This can cause static sparking&#;damaging the hose and posing a safety hazard. Avoid this occurrence by specifying a carbon black filled core if your process requires static dissipation. Carbon allows the charge to travel to the end connection and exit safely.
Thermoplastic, or nylon, core tubes are often chosen for hydraulic applications. They can withstand high pressures and have a typical temperature range from &#;40°F to 200°F (&#;40°C to 93°C). Available in diameter sizes up to one-inch, thermoplastic core materials are regarded as good economical, general purpose hoses and can handle pressure impulses better than metal and Fluoropolymer core hoses.
Thermoplastic hoses are also highly permeable due to the soft porous material used in its construction. Furthermore, the softer materials have a lower temperature range as compared to many other hose types.
Rubber core hoses are economical, general purpose hoses with a typical temperature range like that of thermoplastic. Rubber hoses have the ability to be crushed without permanent damage and can be built with little to no special equipment. They are also available in diameter sizes above two inches - larger than their counterparts.
Rubber core is recommended for low-pressure uses only. Cosmetically, these hoses are also known to erode quicker.
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Here is a list of materials industrial ducting are made out of. Below gives a brief description of each material and why each is selected for use in flexible hoses . The common thread across all of the below materials is that they are flexible enough to be the material make-up for flexible hoses .
Aluminum Hose &#; Aluminum is one of the most widely used metals in the world. Combining physical durability in a lighter weight form, aluminum is very popular for use as a flexible hose . Compared to other metal compounds used to make flexible hoses, aluminum is the more cost-efficient option. An aluminum hose is best used for high temperature air movement applications. Aluminum is a good material for resisting the corrosive effects of hot temperatures reaching up to 400° F. Aluminum flex hoses also maintain their shape when flexed, which sets them apart from most plastic ducting.
Fabric Hose &#; Hoses made from fabric materials are very popular in the market because they are lightweight, mobile, and budget friendly. If you need a flexible hose for air movement, a fabric hose is a smart option. The fabric material used to make flexible hoses is usually coated in plastic or rubber compounds, the most prominent examples being neoprene and PVC. This coating gives the hoses an improved level of physical durability and even protection against harsh chemicals and elevated temperatures. Since fabric is so lightweight, it is easier to compress fabric hoses down to smaller sizes, meaning that fabric hoses are easy to transport.
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