Limonene is a natural cleaning solvent made from the oil in orange and lemon peels. It belongs to a group of compounds called terpenes, which occur in many plants. Limonene is widely used in laboratories, workshops and households because it can remove oils, wax and grease without the harshness of synthetic solvents.
It is renewable, biodegradable and low in toxicity. The citrus scent makes it more pleasant to work with than products like White Spirit or Industrial Methylated Spirit. For people who want a more sustainable option, limonene is an effective citrus degreaser that still performs well.
Key Characteristics
Formula: D-Limonene (C₁₀H₁₆)
Source: Extracted from orange and citrus peel oil, often as a by-product of juice production
Appearance: Clear, colourless liquid with a citrus smell
Solubility: Insoluble in water, mixes well with alcohol and many organic solvents
Environmental profile: Biodegradable and from renewable plant sources
Flash point: About 48°C
Specific Uses
1. Degreasing and Equipment Cleaning
Limonene removes oil and tar from tools, machinery and glassware. It can be used on its own or diluted. Many workshops use it instead of chlorinated or petroleum-based degreasers because it is safer and gives off fewer fumes.
2. Removing Sticker Residue and Adhesives
Limonene is an effective way to remove sticker residue, sticky label marks and dried adhesive. Apply a small amount to a cloth, hold it against the residue for a minute to soften it, then wipe away.
It lifts adhesive from glass, plastic and metal without damaging the surface, which makes it a good option for removing glue from glass where a stronger solvent such as acetone would be too harsh. Wipe the area with clean water afterwards to remove the citrus film.
3. Household and Automotive Cleaning
Limonene is often used in cleaning sprays and degreasers for kitchens and cars. It can remove baked-on grease from cookers and cooker hoods, and oil, tar and road grime from wheels and engine bays. It works well in diluted form and has a natural fragrance rather than a chemical one.
4. Laboratory and Workshop Solvent
In labs, limonene can clean resin and polymer build-up from equipment and glassware. It can also be used as a solvent in certain organic extractions. It is often preferred when low odour and user safety are important.
5. Eco-Formulations and Manufacturing
Because it comes from renewable plant oil and breaks down easily in the environment, limonene is used in eco-friendly products such as paints, coatings, inks and cleaners. It is also found in small amounts in some soaps and waxes.
Environmental and Safety Information
Limonene is classed as low-toxicity and breaks down naturally. It has a smaller environmental impact than many other solvents and does not contribute to ozone depletion.
It should still be used carefully. Concentrated limonene can cause mild skin irritation, and it can oxidise over time if exposed to air and light. Users should wear gloves and work in a ventilated area. Waste should be collected and disposed of correctly.
Store limonene in a cool, dry area away from direct sunlight or ignition sources. It is flammable at higher temperatures and should be treated like any other solvent. Always read the product label and safety data sheet before use.
