Naphthas can enter into your system through inhalation and vapors, ingestion, and eye and skin contact. Naphthas are irritating to the skin, eyes, and upper respiratory tract. Skin chapping and sensitivity to light may develop after repeated contact.
Petroleum naphtha has a lower order of toxicity than coal tar naphtha. Overexposure to either type of naphtha may cause central nervous system depression with symptoms of inebriation followed by headache and nausea. When using a product that contains naphtha, be certain to wear gloves. Provide for adequate ventilation, making sure that the fumes are blowing away from you.