Choose Pneumatic Tube and Hose Materials from Motion, Media, and Environment

Pneumatic conductors carry compressed air between preparation equipment, valves, cylinders, grippers and tools. Material selection affects not only pressure capacity but also how the line bends, grips in a fitting, resists condensate and survives the machine environment.

The same polymer name can cover multiple grades and constructions, so final limits must come from the exact tube or hose datasheet.

Decide whether the line is tubing or hose

Flexible pneumatic tubing is commonly specified by outside diameter because push-in fittings seal and grip that surface. Hose is commonly specified by inside diameter and may use barbs, ferrules, clamps or crimped ends. Confirm the convention before selecting fittings.

Hose can contain a tube, reinforcement and cover made from different materials. The inner layer must suit air, oil carryover, moisture or process gas; reinforcement controls pressure and stability; the cover faces abrasion, UV, chemicals and handling.

Use polyurethane where repeated motion drives the choice

Polyurethane tubing is often selected for flexibility, abrasion resistance and resistance to kinking in moving machine routes. It can be useful for compact pneumatic controls and lines that flex repeatedly.

Performance varies by formulation. Check temperature, hydrolysis behavior, chemical exposure, hardness, tube support and whether the fitting is approved for that outside diameter and wall.

Compare nylon when strength and temperature range matter

Nylon tubing can provide strength, pressure capability and chemical resistance in a relatively light line. It is often less soft than polyurethane, which may help straight routing but change the minimum bend and force applied to small fittings.

Moisture absorption, cold-temperature behavior and grade selection can affect dimensions and flexibility. Use the producer's conditioning and rating data rather than a universal pressure or temperature number.

Keep polyethylene and polypropylene roles distinct

Polyethylene can be economical for lower-demand controls and relatively straight runs. It is light and resistant to many chemicals, but grade and wall determine kink resistance, temperature range and pressure capability.

Polypropylene offers low density and useful resistance to selected chemicals. Outdoor use, UV exposure and stress cracking still require product-specific evidence; the polymer name alone does not guarantee weather resistance.

Treat PVC as a formulated hose material

Flexible PVC is common in general air, water and process hose where visibility, cost or chemical resistance is useful. Plasticizers, reinforcement and temperature strongly affect flexibility and rating.

Do not infer repeated sterilization, food contact or compressed-air suitability from a clear appearance. Verify the finished hose, applicable certification and cleaning method.

Use PTFE for a defined chemical or temperature need

PTFE provides broad chemical resistance and can serve higher-temperature or high-purity applications when the complete construction and fittings are qualified. It is less forgiving of kinking and may require specialized ends, reinforcement or bend control.

Electrical behavior also depends on the compound and construction. A standard PTFE tube should not be assumed static-dissipative; conductive or dissipative requirements must be specified and verified.

Size the line for dynamic air demand

Valve and cylinder performance depends on delivered flow, not just compressor pressure. Calculate demand, cycle rate and allowable pressure drop, then consider tube inside diameter, run length, fittings, silencers and bends. An outside diameter that fits the port may leave too little internal area.

Long small-bore lines can slow filling and exhausting. Oversized lines add volume, cost and routing difficulty. Measure performance at the actuator during the real cycle when response matters.

Check the installed environment

Map flexing, abrasion, heat, weld spatter, cleaners, lubricator oil, compressor condensate, UV and possible vacuum. Support the line without crushing it, provide the specified bend radius and keep tensile load away from push-in connections.

Before ordering, record tube OD or hose ID, wall, material grade, pressure and temperature range, media, motion, environment, color or identification need and fitting system. A useful material comparison narrows the candidates; the exact product data makes the final connection safe and repeatable.