Paraffins are a group of hydrocarbon compounds made entirely of carbon and hydrogen atoms arranged in straight or branched chains. The term covers a wide range of substances, from lightweight gases to solid waxes, and you’ve almost certainly encountered paraffins in multiple forms: candle wax, moisturizing creams, fuel for heaters, and even laxatives. What ties them together is a shared chemical structure, but in everyday use, “paraffin” means different things depending on where you live and what industry you’re talking about.
The Chemistry Behind Paraffins
Paraffins belong to the alkane family of hydrocarbons, following the general formula CnH2n+2. That just means each molecule is a chain of carbon atoms fully surrounded by hydrogen atoms, with no double bonds or ring structures. This “saturated” arrangement makes paraffins chemically stable and relatively unreactive, which is actually how they got their name: “paraffin” comes from the Latin parum affinis, meaning “lacking affinity” or “not very reactive.”
The length of the carbon chain determines whether a paraffin is a gas, liquid, or solid at room temperature. Methane, the simplest paraffin, has just one carbon atom and is a gas. Chains of roughly 5 to 17 carbons produce liquids like those found in fuels. Paraffin wax consists of much longer chains, typically 22 to 27 carbon atoms, which pack together tightly enough to form a solid.
Paraffin Wax
When most people say “paraffin” without any qualifier, they’re referring to paraffin wax. It’s a white or colorless, slightly translucent solid that melts between about 48°C and 66°C (120°F to 150°F). It’s derived from petroleum during the refining process and is one of the most widely used waxes in the world.
Candle making is the most familiar application. Paraffin wax burns cleanly, holds fragrance and dye well, and is inexpensive to produce, which is why the majority of commercial candles are paraffin-based. Beyond candles, paraffin wax is used to coat paper and cardboard (those shiny milk cartons, for instance), to seal jars of homemade preserves, and as an electrical insulator in capacitors and other components. It also shows up in crayons, floor polishes, and food-grade coatings on fruits and cheeses to slow moisture loss.
Liquid Paraffin and Mineral Oil
Liquid paraffin is a highly refined, colorless oil that goes by several names: mineral oil, white oil, or paraffinum liquidum on cosmetic labels. It’s the liquid form of the same petroleum-derived hydrocarbons, just with shorter carbon chains that stay fluid at room temperature.
In skincare, liquid paraffin is one of the two most commonly used occlusive agents (the other being white petrolatum, better known as Vaseline). It works by forming a thin, water-repelling layer on the skin’s surface that physically blocks moisture from evaporating. This makes it effective for dry skin conditions, eczema management, and protecting cracked or irritated skin. You’ll find it in lotions, creams, baby oil, and ointments.
Liquid paraffin also has a longstanding role as a laxative. Taken orally, it coats the intestinal walls and the surface of stool, lubricating the passage through the gut. It’s generally used for short-term relief of constipation rather than as an ongoing treatment.
Paraffin as Fuel
In the United Kingdom, South Africa, and several other countries, “paraffin” is the everyday word for kerosene. This can cause real confusion, because in North America “paraffin” almost always means the wax. Kerosene is a liquid fuel that has been used for cooking, heating, and lighting since the mid-19th century, when it replaced the more expensive whale oil in lamps.
Kerosene itself is actually about 55% paraffin-type hydrocarbons by weight, mixed with other hydrocarbon classes. With performance additives, it also serves as the basis for jet fuel. In many lower-income countries, kerosene remains a primary household fuel for cooking and lighting, though its use carries risks from carbon monoxide buildup and fire hazards in poorly ventilated spaces.
Paraffin Wax Baths in Physical Therapy
Heated paraffin wax baths are a common tool in physical therapy and rehabilitation. The wax is melted to a warm, controlled temperature, and you dip your hands or feet into it repeatedly to build up a thick coating. The wax holds heat well and transfers it gradually into the joints and soft tissues beneath the skin, which improves circulation and promotes relaxation before hands-on therapy begins.
This technique is used for a range of conditions. Research has examined its effects on rheumatoid arthritis, osteoarthritis of the hand, scleroderma, and post-traumatic stiffness. A study on patients recovering from hand injuries found that paraffin wax baths combined with joint mobilization techniques were more effective at restoring range of motion than mobilization alone. Sessions typically last about 20 minutes, applied before stretching or exercise to make the tissues more pliable.
Safety Considerations
Highly refined paraffin, the kind used in cosmetics, food coatings, and medicine, has a strong safety record when used as intended. The key word is “highly refined.” Impure or poorly refined paraffin oil is classified as a carcinogen, which is why pharmaceutical and cosmetic grades go through extensive purification.
Liquid paraffin taken orally in excessive amounts can cause abdominal pain, nausea, and, paradoxically, constipation. The more serious risk is aspiration: if liquid paraffin is accidentally inhaled rather than swallowed (more common in young children or elderly individuals), it can reach the lungs and cause a condition called hydrocarbon pneumonitis, a chemical inflammation of lung tissue that leads to coughing, shortness of breath, and sometimes severe respiratory distress.
On the skin, prolonged or repeated exposure to industrial-grade paraffin oil can cause irritation, redness, or contact dermatitis in sensitive individuals. Cosmetic-grade products used as directed rarely cause these issues. Paraffin wax used in candles can release small amounts of volatile organic compounds when burned, though levels in well-ventilated rooms are generally low.
Why “Paraffin” Means So Many Things
The confusion around paraffin comes from the fact that a single chemical family spans gases, liquids, and solids, and different industries and regions adopted the word for whichever form they used most. A British person buying “paraffin” at a hardware store is getting lamp fuel. An American buying “paraffin” at a craft store is getting candle wax. A pharmacist dispensing “liquid paraffin” is handing over mineral oil. They’re all alkane hydrocarbons from petroleum, just at different chain lengths and levels of refinement. Knowing which form someone is referring to is the first step to understanding any advice, product label, or safety warning that mentions paraffin.