I'm the office administrator for a 55-person custom fabricating shop. I manage the MRO budget, which sits around $90,000 per year, and I report to operations and finance. When I took over purchasing in 2022, I inherited a supply closet with nine vendors and no real standard for air hose. A bench hose would be too long, a wheeled-tool hose would be too stiff, and one station made do with an air hose short on length until a fitting finally pulled loose. That near-miss started the comparison that became my standard.
If you've ever looked at a coil of damaged hoses and thought 'we just need hose,' you know the problem. The material is not decoration. It is the safety plan and the maintenance budget.
Why I compared PET and TPU instead of trusting the label
PET is polyethylene terephthalate. In flexible hose, it usually shows up as a polyester braid or reinforcement layer. TPU is thermoplastic polyurethane. It usually shows up as a flexible tube, outer jacket, or unbraided soft hose. A hose can contain both: a TPU inner tube, a PET braid for pressure resistance, and a TPU outer jacket for durability.
This is why the simple question of PET vs TPU is often the wrong one. The real question is which layer is doing the work. If the PET layer is an exposed outer braid and the hose gets dragged across concrete, that braid will eventually fray. If the TPU hose has no reinforcement and your line runs at high pressure, the tube may swell or fail at the fitting. The same two letters can describe very different products.
I have ordered Honeywell products for years. PPE, sensors, thermostats, maintenance supplies. Honeywell products have usually been a safe baseline because their documentation is decent. But the brand does not replace the data sheet. In this comparison, the label told me less than the specification sheet did.
Dimension one: movement and abrasion
For our maintenance and production benches, the most common failure mode is not pressure. It's abrasion. Hoses get pulled around equipment, caught on cart corners, and dragged over the same concrete path every day. In that situation, TPU wins for exposed surfaces. A TPU jacket scuffs, but it holds up far longer than an exposed PET braid or a cheaper PVC cover.
What surprised me was how quickly a PET braid can look damaged. It may still hold pressure for a while, but shredded fibers become a red flag. Once the reinforcement is exposed, the hose is one sharp edge away from a blowout. If the hose moves during normal work, my conclusion is simple: choose a TPU outer layer or put a spring guard over the hose.
Dimension two: flex, kink, and cold mornings
A short workbench hose gets folded, looped, and stepped on more often than a long hose on a reel. TPU is more flexible in many shop conditions and tends to behave better when the building is cold. PET braid can make a hose more stable under pressure, but the stability comes with extra stiffness.
I will add a nuance: kink resistance depends on construction, not only chemistry. A poorly built TPU hose can collapse at the bend just like a poorly braided PET hose. The useful habit is to compare the minimum bend radius on the data sheet, not the marketing photo. If the numbers are close, I buy the TPU version for moving applications and the PET-reinforced version for fixed lines.
Dimension three: Teflon danger and temperature limits
Now let's address the search term that gets attention: Teflon danger. The word Teflon is a brand name, and the underlying material is PTFE. There is a real concern about overheating PTFE and about legacy PFOA chemistry used in older manufacturing. But the answer is not a blanket ban on PTFE products.
In an industrial hose setting, the danger mostly appears when someone ignores thermal limits. PTFE can be the right choice for aggressive chemicals or high heat, but only when the hose cannot be overheated by the process, by hot work nearby, or by a failed compressor component. The safe move is to obtain the safety data sheet, confirm the maximum continuous temperature, and ask the supplier whether the PTFE manufacturing process still uses PFOA. Most responsible suppliers have moved on, but I still ask.
I am not giving a chemistry lecture here. I am sharing a verification habit. Look up the NIOSH guidance or the SDS before you put PTFE near a heat source. The most frustrating part of researching Teflon danger is that a small amount of prevention prevents a very bad day.
The checklist that became my purchase order standard
The 12-point checklist I built has saved us more than one expensive mistake. Five minutes of checking beats five days of correction. Here is the short version I use before any hose order:
- Identify the material layers: is PET reinforcement on the inside or outside? Is the outer jacket TPU or PVC? Is the liner PTFE?
- Confirm the continuous working pressure at the actual operating temperature.
- Check the minimum bend radius and compare it with the bend radius where the hose will live.
- Look for oil, coolant, and chemical compatibility in the SDS or manufacturer technical bulletin.
- Ask about the heat source. Is the hose near a motor, dryer, weld zone, or hot surface?
- Measure the actual hose path. If the line is tight and strained at the fitting, an air hose short by even a few inches can cause a failure.
The Honeywell Home app is not an MRO tool. I use it to schedule HVAC filter reminders and catch building issues early. I mention it because the logic applies to production supplies too: a scheduled check is the cheapest insurance you can buy. The app does not choose a hose for me. It simply reminds me to pay attention before the emergency starts.
What I would choose now
If I had to standardize one bench hose for light-industrial compressed air, my first choice is not one material. It is a construction that uses TPU for the exposed surfaces and PET braid where pressure reinforcement is required. That combination is common in hybrid hoses, and it solves both problems.
If the supplier only offers straight material choices, I pick TPU for moving and workbench applications. I pick PET-reinforced hose for permanent lines that stay out of the way. I consider PTFE-lined hose only when the fluid or temperature demands it, and I verify the thermal safety data first. There is no perfect material for every corner of the shop. There is only the correct material for the conditions you actually have.