Yes, WD-40 is classified as a hazardous chemical. While safe when used as directed, its flammability, potential for respiratory irritation, and skin effects require careful handling.
What makes WD-40 hazardous?
WD-40 contains petroleum-based solvents and aerosol propellants that classify it as hazardous under safety regulations. Its primary risks come from flammability, inhalation of vapors, and skin irritation. The product is not acutely toxic in small amounts but requires precautions during use.
Flammability
The solvent base in WD-40 consists of refined petroleum distillates, which are highly flammable. The spray mist can ignite easily from sparks, flames, or high heat. Even after spraying, flammable vapors can linger in enclosed spaces. Never use WD-40 near open flames or hot surfaces.
Health effects from exposure
Exposure typically occurs through inhalation, skin contact, or accidental eye contact. The severity depends on concentration, duration, and ventilation.
Inhalation risks
Spraying WD-40 in confined or poorly ventilated areas can lead to vapor buildup. Breathing these fumes may cause coughing, dizziness, headaches, or nausea. Long-term or repeated exposure without protection can worsen respiratory irritation. Intentional inhalation, such as solvent abuse, is extremely dangerous and potentially fatal.
Skin and eye irritation
WD-40 removes natural oils from skin, which can lead to dryness, cracking, and dermatitis with repeated use. People with sensitive skin or existing conditions like eczema are more vulnerable. If sprayed in the eyes, it causes immediate stinging and redness. Flush with water immediately if contact occurs.
What’s inside WD-40?
The exact formula is proprietary, but safety data sheets list key components. These include aliphatic hydrocarbons (similar to mineral spirits), petroleum base oil for lubrication, and propellants like carbon dioxide or propane/butane. Additives include corrosion inhibitors and surfactants. Despite myths, it does not contain fish oil.
Safe handling and precautions
To reduce risk, always use WD-40 in a well-ventilated area. Wear gloves to protect your skin and safety glasses if spraying overhead or near the face. Keep the can away from heat sources and do not puncture or incinerate. Store upright in a cool, dry place. If used frequently in a workplace, follow OSHA and GHS safety guidelines.
What to do in case of exposure
- Inhalation: Move to fresh air immediately. Seek medical attention if symptoms persist.
- Skin contact: Wash with soap and water. Apply moisturizer if irritation occurs.
- Eye contact: Rinse with water for at least 15 minutes and consult a healthcare provider.
- Ingestion: Do not induce vomiting. Seek emergency help immediately due to aspiration risk.