Chemicals are vital to everyday life. They’re found in the fertilizers that feed our crops, the soaps and sanitizers that protect public health, the fuels that power industrial facilities, and the materials used to construct our homes and workplaces.
Chemical and petrochemical manufacturing touches nearly every sector of the economy. In the United States, the chemical industry supports roughly 25% of GDP. [1]
Its influence is so widespread that, according to the U.S. Department of Energy, chemicals and petrochemicals account for roughly 40% of all industrial energy use and emissions in the U.S. [2]
Many of the substances that run through chemical plants are toxic, flammable, explosive, or corrosive. And they’re often processed under extreme heat and high pressure, conditions that significantly increase the risk of equipment failure, which can compromise yield, endanger workers, and cause lasting environmental damage.
Chemical companies must navigate increasingly stringent environmental regulations aimed at reducing pollution, waste, and emissions. Even the smallest leaks are now subject to measurement, reporting, and penalties, making containment and compliance more essential than ever. Without durable, reliable piping and hose systems in place, your operations, safety, and reputation are on the line. Chemical transfer hoses made of metal are engineered to withstand—and excel in—the most demanding industrial environments.
What Makes Metal Hoses Ideal for Handling Aggressive Chemicals?
Crafted from stainless steel and special alloys, flexible metal hoses offer exceptional corrosion resistance and long-term durability. They won’t crack, swell, or weaken as easily when exposed to solvents or acids. This stability is paramount in situations where aggressive chemicals are constantly mixed, stored, and moved.
Chemical transfer hoses as well as steam and process piping lines in chemical plants are built to withstand high pressures and temperature fluctuations without collapsing, igniting, or bursting, making them ideal for high-heat, high-pressure environments. Their firm, leak-tight construction doesn’t compromise their flexibility or capacity to absorb movement and vibration. As a result, flexible metal hoses are also well-suited for safely transferring materials between containers, trucks, railcars, and barges.
Why Metal Is the Best Choice for Transferring Harsh Chemicals
While non-metallic hoses, such as those made from Teflon (PTFE), may be suitable for certain uses, they lack the durability and reliability that metal hoses provide.
The key concern is that Teflon and other polymer-based hoses are permeable which allows small amounts of media to gradually escape through the hose wall. Over time and with repeated use, their porosity can lead to leaks that leach chemicals into the atmosphere and surrounding environment. Metal hoses, by contrast, are inherently non-porous. They prevent both the escape of hazardous media and the ingress of contaminants, eliminating these safety and environmental risks.
In the chemical industry, heat is often unavoidable. Many chemical reactions generate significant thermal energy even without the use of external heat sources. While rubber and plastic hoses decompose and degrade quickly above a certain threshold, metals retain their strength better as temperatures rise. The 300 series austenitic steels have an operating temperature range that far outpaces the competition.
Corrosive flow media is another defining feature of chemical manufacturing processes. Thanks to the inclusion of chromium and other alloying elements, metal hose offers excellent corrosion resistance across a wide range of chemicals. In many applications, metal hoses simply last longer because they resist chemical attack more effectively than hoses made from other materials.
This concept of “lasting longer” refers to material wear. Corrosion is the gradual deterioration of a material. The more corrosion-resistant the material, the slower that deterioration—and the longer the service life.
Beyond corrosion, shelf life is another limitation for rubber and plastic hoses. These materials break down over time, even in storage. The result is shorter service life and more frequent replacement cycles. Metal hoses do not have a shelf life, making inventory easier to manage.
How Penflex Supports Chemical & Petrochemical Applications
Chemical plants face countless risks that can compromise both worker safety and the health of the environment. That’s why Penflex hoses are engineered with safety, reliability, and long-term performance at their core—to help eliminate those risks. Here are the features that allow our chemical transfer hoses to accomplish that:
Materials: Penflex offers a wide selection of corrosion-resistant alloys and heavy-walled hoses designed to handle aggressive media. Our in-stock options, including 316L, 321, Inconel 625, Hastelloy C-276, and Monel 400, are ready for immediate delivery to support your operational demands. Others are available upon inquiry.
Corrosion resistance: Penflex hoses are built with heavier wall thicknesses to withstand the harsh demands of chemical and petrochemical processing. Many chemicals have high penetration rates that can corrode or erode less robust materials. Thinner-walled hoses, while ideal for certain applications, can fail prematurely when transferring harsh chemicals, leading to frequent replacements. For the transfer of highly corrosive materials like chlorine, Penflex offers hoses made from superalloys Inconel 625, Monel 400, and Hastelloy C-276.
Size range: From ¼” to 24”, Penflex’s flexible metal hoses come in a range of sizes that can be seamlessly integrated into any configuration or space.
High temperature properties: With a maximum service temperature of 1500°F, the 300 series stainless steels are engineered to maintain their strength as temperatures rise better than other materials of hose construction. For higher temperature applications, Penflex’s 625 Series made with Inconel 625 may be an appropriate solution.
Pressure ratings: When metal hoses are pressurized, the hose material naturally expands. The braid functions like a restraining cage, preventing the hose from elongating or swelling and enabling it to operate safely under harsh conditions. Depending on the size and hose series, expect pressure ratings up to 5,000 PSI.
Quality welds: High-quality welds are essential to hose integrity and long-term performance, especially in chemical applications. At Penflex, we achieve this through a proven process that includes TIG welding and argon purging, which together produce clean, strong welds without compromising corrosion resistance. Our team includes ASME Section IX–certified welders, on-site certified welding instructors, and non-destructive examination (NDE) specialists, ensuring every assembly is tested and leak-tight before it leaves our facility.
Leak Testing: While all chemical transfer hoses are subject to our standard leak testing process, we do offer other, more acute leak testing methods. For instance, Penflex’s chlorine transfer hoses are tested to a maximum leak rate of 5 x 10-6 at two times MAWP using a helium mass spectrometer. (Given its porosity, PTFE cannot be tested using helium.)
Penflex routinely designs and manufactures transfer hoses for the following flow media:
Ammonia
Ammonia is one of the most widely used chemicals. The gas is used in crop production, commercial refrigeration systems, household cooling, and as a hydrogen fuel source. However, it poses serious health risks, which is why the transfer of ammonia is subject to stringent specifications established by both government agencies and industry associations.
Ammonia corrodes copper and zinc alloys and can quickly degrade rubber and certain plastics. That’s why metal hoses, durable and compatible with ammonia, offer the ideal solution for safe transfer.
Chlorine
Used in chemical plants for many applications, from water purification to wastewater management, chlorine transfer hoses are highly-specialized metal hoses designed to transfer chlorine gas and liquid chlorine. Both are extremely hazardous and corrosive substances.
Our transfer hoses provide leak-tight, corrosion-resistant connections, ensuring the safe and smooth transfer of chlorine between fixed piping systems and railcars, tank trucks, storage tanks, and containers. Penflex’s Monel and Hastelloy chlorine transfer hoses fully comply with The Chlorine Institute Pamphlet 6 and are commonly used for loading and unloading operations.
Molten Sulfur and Sulfuric Acid
Sulfur is most often created during natural gas and petroleum refining, however, the chemical element also plays an important role in agriculture, renewable energy, food preservation and production, sugar refining, and winemaking.
In most sulfur applications, Penflex’s 300 series offers sufficient corrosion resistance. When handling more aggressive sulfur media with higher penetration rates, such as sodium hydrogen carbonate, sulfur chloride, and sulfuric acid, our specialized hoses, Hastelloy C-276 and Inconel 625 offer significantly greater corrosion resistance and long-term durability.
When you need to maintain media at elevated temperatures as is the case with molten sulfur, steam jacketed hoses—which is essentially a hose within a hose—should be used. With these hoses, steam or other temperature-controlled fluids run through the outer hose to keep the flow media inside at the desired temperature.
Recommended Products for Chemical Applications
P4 Series
General purpose industrial hose used for many chemical applications.
776 Hastelloy
For the most aggressive chemical applications like chlorine transfer, Hastelloy C-276 may be the best alloy for the job.
1400 Series
Penflex’s most robust design, 1400 Series, features our thickest wall construction and 3 or 4 braid layers for the highest pressure applications.
Beyond the Product: The Penflex Partnership
At Penflex, we see every order as an opportunity to continue building our relationship with a current customer–or the beginning of a partnership with a new customer. Our customers count on us not only for a quality product, but also for expertise, responsive service, and resources to help them get the most out of their investment.
Dedicated Engineering Support
Our sales engineers work closely with you from project prototype through delivery, helping define requirements for new products and replacements. A dedicated account manager means you have a single point of contact who understands your business and responds quickly with thoughtful solutions.
Practical Technical Resources
From online calculators and engineering bulletins to in-person and virtual training, we give your team the tools to make informed decisions and the confidence to install, operate, and maintain hoses for maximum longevity.
Full Quality Documentation
On request, we provide complete record packs—including material test reports, leak and pressure test results, and cleaning procedure documentation—so you can meet compliance requirements and maintain full traceability.
Our commitment to service is reflected in our 99% customer retention rate and an average customer relationship of 20 years. We aim to make every interaction count, combining technical know-how with the kind of service that turns first-time buyers into long-time partners.
Footnotes
[1] ICF. U.S. oil and gas infrastructure investment through 2035. Retrieved November 17, 2025 from https://www.icf.com/insights/energy/us-oil-and-gas-infrastructure-investment-through-2035.
[2]U.S. Department of Energy. Chemical and Petrochemical Manufacturing. Retrieved November 17, 2025 from https://www.energy.gov/eere/iedo/chemical-and-petrochemical-manufacturing.