Material and features of PVC suction hose
Fluoropolymer
This type of inner tubing offers a wide range of applications. In fact, it is rapidly replacing silicone as the top choice for hygienic use. The three most common fluoropolymers are PTFE, PFA, and FEP. Together, they perform well across a broad temperature range, from -53°C to 230°C.
Fluoropolymer tubing is the most chemically resistant inner tube on the market. Moreover, it resists aging and sticking. Additionally, it is easy to clean and can endure repeated steam cleaning. Similar to metal inner tubes, it also has a lower absorption rate.
New technology has enabled PTFE hoses to match the flexibility of silicone hoses. Bonding techniques, for example, can add layers of fiberglass braiding to enhance flexibility. This process prevents glue from seeping into the inner tube wall, thus avoiding contamination.
However, fluids can generate static electricity as they flow through the inner tube. This static buildup can lead to sparks, which may damage the rubber hose and create a safety hazard. To mitigate this risk, manufacturers often add carbon black to the inner tube. Why? Because carbon allows electrical charges to safely dissipate to the outlet.
Thermoplastic
Thermoplastic hoses, such as those with nylon inner tubes, are frequently used in hydraulic applications. Common thermoplastic hydraulic hoses include SAE 100 R7, SAE 100 R8, and R14. These inner tubes are ideal for high-pressure environments. They can also operate within a temperature range of -40°C to 93°C. Most of these hoses have a diameter of up to one inch. Nylon tubing is a cost-effective, versatile option. In fact, it offers much better pressure resistance than flexible metal hoses.
That said, thermoplastic hoses have a higher permeability rate due to their soft, porous material structure. Furthermore, their operational temperature range is narrower compared to other materials.
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