If you’ve ever worked in industries like chemical processing, pharmaceuticals, food and beverage, or oil and gas, you know that even a small hose failure can lead to costly downtime, safety hazards, or product contamination. As a supplier of stainless steel braided PTFE lined flex hoses, one of the most common questions I get from engineers, plant managers, and maintenance teams is this: What is the pressure rating of these hoses? It’s not a one-size-fits-all answer—pressure ratings depend on a handful of critical factors, and getting this wrong can mean the difference between a reliable system and a catastrophic leak. Let’s break down what you need to know, straight from the perspective of someone who’s been selling and supporting these hoses for years.
First, let’s establish what we’re talking about when we reference SS braided PTFE lined flex hoses. These hoses combine the best properties of PTFE (Teflon)—its exceptional chemical resistance, high and low temperature tolerance, and non-stick surface—with the structural strength of a stainless steel braided exterior. The braid acts as a reinforcement to hold pressure, while the PTFE liner handles the fluid compatibility. You’ll see variations in designs, too: some are convoluted (corrugated) for extra flexibility, others have a smooth bore for easier cleaning, and sizes range from tiny diameter lines for lab equipment to heavy-duty hoses for pipeline transfers. If you want to explore our full range, you can check out the product page for the exact SS Braided PTFE Lined Flex Hose we supply, but let’s get back to pressure ratings.
The base of all pressure ratings starts with the hose’s design: specifically, the PTFE liner type, the number of stainless steel braid layers, the braid material grade, and the hose’s internal diameter (ID). Let’s start with the liner. PTFE liners come in two main forms for flexible hoses: smooth bore and convoluted. Smooth bore liners have a flat, uniform interior, which is ideal for applications where flow is a top priority (like food and beverage transfer, where rough surfaces can trap contaminants). Convoluted liners have ridges along the inside, which make the hose much more flexible—perfect for tight routing or applications where the hose needs to bend repeatedly without cracking. Both liner types impact pressure, because a thicker liner or a liner with a stiffer structure can handle more pressure before failing. For example, our Convoluted PTFE Lined SS Braided Hose typically has a slightly lower maximum pressure than our SS Braided Smooth Bore PTFE Hose of the same ID, because the convolutions add small weak points where pressure can concentrate.
Next, the stainless steel braid is the most important factor in pressure rating. The number of braid layers directly correlates to how much pressure the hose can hold. Most SS braided PTFE hoses have either one or two braid layers: single-braid hoses are designed for low to medium pressure applications, while double-braid hoses are built for higher pressure. The grade of stainless steel also matters—304 stainless is standard and works well for most applications, but 316 stainless has higher corrosion resistance, which is critical for handling harsh chemicals. If you’re working with highly corrosive fluids, 316 braid is non-negotiable, and it can slightly increase the maximum pressure rating compared to 304 braid because it’s stronger and less likely to degrade over time.
Internal diameter is another key variable. For a given braid and liner type, smaller diameter hoses have higher pressure ratings. Think of it this way: a narrow pipe has less surface area for pressure to act on, so it can hold more pressure before the walls stretch or burst. For example, our High Pressure 5/8" Braided Stainless Steel Teflon Hose is a heavy-duty line rated for higher pressures precisely because its 5/8 inch ID balances strength and flow. Conversely, a 2 inch ID hose of the same braid and liner would have a much lower maximum pressure, as the larger diameter means more force is distributed across the liner walls.
Now, let’s get into actual numbers. To keep this practical, I’ll reference the standard ratings for our most common hoses, but always note that custom designs can adjust these. For single-braid SS braided PTFE hoses: for 1/4 inch to 1 inch ID, the maximum working pressure ranges from 150 PSI to 300 PSI. For double-braid hoses, that jumps to 300 PSI to 600 PSI, depending on ID. Our high-pressure lines, like the 5/8 inch double-braid hose, hit up to 500 PSI working pressure—plenty for most industrial processes, but if you need even higher, we can special-order hoses with extra braid layers or high-grade 316 stainless for up to 1,000 PSI working pressure.
Wait, but what’s the difference between working pressure, burst pressure, and proof pressure? This is where a lot of people get confused, and it’s a critical distinction. Working pressure is the maximum pressure the hose can handle safely on a continuous basis—this is the number you should use for your system design, never exceed this. Burst pressure is the pressure at which the hose will rupture, which is much higher (usually 4 to 5 times the working pressure). For example, a hose with a 300 PSI working pressure will have a burst pressure of around 1,200 to 1,500 PSI. Proof pressure is the pressure applied during testing to make sure the hose is free of defects—usually 1.5 times the working pressure, just to verify it holds up. Ignoring these distinctions can lead to overloading a hose, even if you’re only operating at a pressure that seems well below the burst number.
Another factor that many buyers overlook: temperature. PTFE has a wide temperature range, but extreme hot or cold can affect its pressure rating. At temperatures above 392°F (200°C), PTFE starts to soften, which reduces its ability to hold pressure. Conversely, at very low temperatures (below -100°F or -73°C), PTFE becomes stiffer, which can make the liner more prone to cracking under pressure, especially if the hose is being bent. If your application involves temperatures at either end of the spectrum, you’ll need to derate the hose’s working pressure. For example, a hose rated for 300 PSI at room temperature might only be good for 200 PSI at 350°F—this is a calculation we help customers with all the time, because getting the temperature adjustment right is non-negotiable.
Fluid compatibility also plays a role. Even if a hose has the right pressure rating on paper, if it’s not compatible with the fluid you’re moving, the liner can degrade, which changes its pressure handling over time. PTFE is famous for being compatible with almost all chemicals, including acids, bases, solvents, and corrosive gases, but there are exceptions—like molten metals or certain fluorinated compounds at very high temperatures. If you’re working with a unique fluid, I always recommend testing a small sample first, or consulting with our engineering team to confirm the liner is suitable. We’ve had customers who bought a generic SS braided PTFE hose only to find it degraded within a few weeks because they were using it with a chemical that, while not common, breaks down PTFE over time.
How do manufacturers test these pressure ratings? Reputable suppliers like us don’t just pull numbers out of thin air. We follow industry standards from organizations like the Hose Institute (part of the Industrial Fabrics Association International) and ISO 10380, which covers flexible hose specifications. The testing process involves pressurizing the hose with water (in most cases) in a controlled environment, measuring for leaks, deformation, or rupture. We also test for cyclic pressure, which is important for hoses that are moved or bent regularly—cycling pressure up and down can cause fatigue in the braid or liner over time, so these ratings are often lower than static pressure ratings.
Now, when should you care about pressure ratings and when can you be flexible? If your application is a static line that stays in place, moving only occasionally for maintenance, you can stick close to the published working pressure. But if you have a hose that’s routed around moving equipment, needs to bend frequently, or is part of a high-pressure system (like a hydraulic line or a process that requires high flow at constant pressure), you need to build in a safety margin. Most industry experts recommend a safety factor of 4:1, meaning you should size your hose so the working pressure is no more than 25% of the burst pressure. For example, if you need a hose to operate at 250 PSI, look for a hose with a working pressure of at least 250 PSI, and a burst pressure of 1,000 PSI or higher.
I can’t tell you how many times a customer has called me saying, “I have a hose that’s rated for 300 PSI, but my system runs at 280 PSI—will that work?” The answer is almost always no. Even a small overpressure can shorten a hose’s lifespan significantly, or lead to a sudden failure. We’ve seen hoses burst because operators ignored the pressure gauge and ran the system at 350 PSI, just for a little extra flow—by the end of the shift, the hose had split, spilling toxic chemical all over the plant floor and shutting down production for three days. It’s not worth the risk.
Let’s also talk about our specific products, since I mentioned them earlier. Our Stainless Steel Braided Convoluted Teflon Hose is designed for maximum flexibility, so its pressure ratings are slightly lower than our smooth bore lines. For a 1 inch ID convoluted hose, working pressure is 200 PSI, compared to 250 PSI for the smooth bore of the same ID. But if you need to route a hose through tight spaces or around rotating parts, the convoluted design is worth the small pressure tradeoff. Our SS Braided PTFE Lined Flex Hose (the general-purpose line) is a middle ground, offering good flexibility and solid pressure ratings for most industrial needs.
If you’re still not sure which pressure rating you need, here’s what to do: first, calculate your system’s maximum operating pressure—this is the highest pressure the line will ever reach, including spikes from valve changes, pump starts, or other system events. Then, check the hose’s published working pressure, and make sure it meets or exceeds that number, with the safety factor we talked about. If you’re working with extreme temperatures, corrosive fluids, or frequent movement, reach out to our team—we can adjust the design, recommend the right hose, or even run custom testing if needed.
At the end of the day, pressure ratings for SS braided PTFE lined flex hoses aren’t just numbers on a spec sheet—they’re a critical part of keeping your operations safe, efficient, and compliant. Cutting corners on pressure ratings might save you a little money upfront, but it’s a recipe for downtime, repairs, and even safety incidents. As a supplier, our job isn’t just to sell hoses—it’s to make sure you get the right hose for your specific application, so you can run your system with confidence.
If you’re ready to find the right SS braided PTFE lined flex hose for your pressure requirements, or you have questions about pressure ratings, liner types, or custom designs, get in touch with our team to discuss your project. We’ll walk you through every step, make sure you have all the information you need, and help you choose a hose that fits your needs perfectly.
References:
- Industrial Fabrics Association International. (2021). Hose Institute Standard for Flexible Industrial Hose and Hose Assemblies. IFAI Press.
- International Organization for Standardization. (2019). ISO 10380:2019, Rubber and plastics hoses and hose assemblies—PTFE lined flexible hoses for general purposes. ISO.
- Stainless Steel Manufacturers Association. (2022). Properties and Selection of Stainless Steels for Industrial Applications. SSMA Technical Bulletin.
- Engineering Toolbox. (2023). Pressure Ratings of Flexible Hoses. Retrieved from engineeringtoolbox.com