What Is Ethylene Used For?

Ethylene (C₂H₄) is used for plastics and packaging production, commercial fruit ripening, medical device sterilization (as ethylene oxide), antifreeze and coolants, PVC manufacturing, detergents and surfactants, polyester fibers, low-temperature refrigeration, and welding fuel gas, among other industrial applications.

WestAir supplies ethylene across California and Arizona.

Why Is Ethylene Such a Big Deal?

Global ethylene production tops 200 million tonnes per year, making ethylene the single highest-volume organic chemical on the planet. Nothing else comes close.

It’s the simplest alkene: two carbon atoms, four hydrogen atoms, one double bond. That double bond is what makes it so reactive and so useful. It’s the starting point that gets transformed into plastics, solvents, fibers, coolants, and dozens of other materials that keep industries running every day.

If ethylene production stopped tomorrow, manufacturing lines would shut down, grocery stores would run out of ripe produce within days, and hospitals would face a medical device shortage.

That’s not hypothetical. Hurricane Harvey disrupted ethylene production along the Gulf Coast in 2017 and sent supply chain shockwaves through multiple industries almost overnight.

How Does Ethylene Become the Plastics in Your Supply Chain?

Polyethylene alone accounts for more than half of global ethylene demand.

The process starts with polymerization, where ethylene molecules chain together under heat and pressure to form polyethylene. Different conditions produce different types, and each one serves a distinct purpose:

• LDPE (low-density polyethylene): flexible films, shrink wrap, squeeze bottles, and plastic bags
• LLDPE (linear low-density polyethylene): stretch wrap, food packaging films, and agricultural sheeting where you need flexibility with better puncture resistance
• HDPE (high-density polyethylene): rigid containers, piping, chemical drums, crates, and hard-shell packaging that needs to take a beating in transit

The range is massive. A chemical drum on a loading dock and the stretch wrap holding its pallet together can both be polyethylene, just engineered differently from the same starting gas.

Beyond polyethylene, ethylene is also the precursor for polystyrene (think foam packaging and insulation) and PET (the plastic in beverage bottles and polyester fibers). If it’s a plastic you encounter in a commercial setting, there’s a good chance ethylene is somewhere in its origin story.

What Makes Ethylene Essential for Fruit Ripening?

Ethylene is a naturally occurring plant hormone that triggers the ripening process in climacteric fruits, and the produce industry has turned that biology into a precise, controlled operation.

Most fruit is picked well before it’s ready to eat. Bananas, avocados, tomatoes, mangoes, pears. They’re all harvested green and firm so they can survive transportation without bruising or spoiling. Without a reliable way to ripen them on schedule, the entire supply chain falls apart.

That’s where ethylene gas comes in. Commercial ripening rooms expose fruit to carefully controlled concentrations, typically between 100 and 150 parts per million (ppm), at specific temperatures and humidity levels. The ethylene kickstarts the same biochemical cascade that would happen naturally, just on the distributor’s timeline instead of nature’s.

The precision matters. Too much ethylene or too long an exposure accelerates decay and shortens shelf life. Too little and the fruit never reaches the color, texture, and sweetness consumers expect.

Ethylene management cuts both ways, though. While some products need ethylene to ripen, others are highly sensitive to it. Leafy greens, broccoli, cauliflower, and cucumbers all deteriorate faster when exposed. Facilities that handle both ripening and storage need to keep ethylene-producing and ethylene-sensitive items separated, with proper ventilation to prevent cross-contamination.

How Does Ethylene Oxide Fit into the Picture?

Ethylene oxide (EtO) is made by oxidizing ethylene, and it’s one of the most critical derivatives in the chemical chain. Its biggest claim: sterilizing roughly half of all medical devices in the United States.

That’s billions of devices per year – heart valves, pacemakers, catheters, surgical kits, syringes, gowns. Many of these are made from heat-sensitive plastics that would warp or degrade under steam sterilization, and EtO is one of the only methods that can penetrate complex packaging and intricate device geometries without damaging the product.

No current alternative matches EtO’s combination of material compatibility and sterilization effectiveness. That makes it, for now, irreplaceable in the healthcare supply chain.

Outside of medical sterilization, ethylene oxide is the starting material for ethylene glycol, which shows up in automotive antifreeze, HVAC coolants, and polyester fiber production. It’s also used to produce the surfactants and detergents that commercial cleaning operations depend on daily.

Ethylene oxide is its own chemical with its own set of applications, but it doesn’t exist without ethylene. Every gallon of antifreeze and every sterile surgical kit traces back to the same source gas.

What Other Industries Depend on Ethylene?

Beyond plastics, produce, and medical sterilization, ethylene quietly supports a long list of industrial processes.

• PVC production: ethylene is a key input for vinyl chloride monomer, which becomes polyvinyl chloride. PVC shows up in construction piping, electrical cable insulation, window frames, flooring, and signage.
• Low-temperature refrigeration: under the designation R-1150, ethylene serves as a refrigerant for industrial cooling systems that need to hit extremely low temperatures, particularly in petrochemical processing and certain food production environments.
• Welding and cutting: ethylene works as a fuel gas in metal fabrication, burning hotter than some alternatives, which makes it useful for applications where precision and heat output matter.
• Polyester fibers and films: through its derivative ethylene glycol, ethylene is a building block for PET, the material behind polyester textiles, beverage bottles, and food-safe packaging films.

How Do You Handle and Store Ethylene Safely?

Ethylene is extremely flammable, colorless, and has a faint sweet odor that’s easy to miss, so safe handling comes down to preparation rather than relying on your senses.

Store cylinders upright in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and ignition points. Temperatures should stay below 125°F. Secure every cylinder with chains or straps to prevent tipping, and keep valve protection caps on whenever the cylinder isn’t connected and in use.

Separation matters. Ethylene cylinders must be stored away from oxidizers like oxygen, with distance or fire-rated barriers between them per your local fire code and National Fire Protection Association (NFPA) guidelines. Keep storage areas clearly labeled and segregate full, in-use, and empty cylinders so there’s no confusion during a shift change or delivery.

Ventilation is your best friend. Ethylene is heavier than air and will collect in low-lying or confined spaces if given the chance. Any area where ethylene is stored or used needs adequate airflow per your local codes, and flammable gas detection is strongly recommended.

Your industrial gas supplier can help you nail down the specifics for your setup.

Lawrence Haynes

Currently serving as Marketing Director at WestAir Gases & Equipment in San Diego, CA Lawrence leverages his expertise in industrial gas solutions and equipment marketing. With a proven track record in cross-industry marketing strategy, he brings a specialized experience in content development, marketing automation, and partner relations to the industrial gas sector.