Touching peracetic acid can result in chemical burns, redness, blistering, and lasting skin damage. The severity depends on concentration and exposure time, but even diluted forms are harmful with repeated contact.
How peracetic acid affects the skin
Peracetic acid is highly corrosive and rapidly penetrates the skin. It oxidizes proteins and disrupts cell membranes, damaging deeper layers like the dermis. Initial contact may not always cause pain—some people feel only a cold tingle—so damage can progress before symptoms appear.
Within seconds, redness spreads. Blistering can begin in under a minute, especially with concentrations above 15%. Because the reaction is chemical, not thermal, there is no natural reflex to pull away. By the time pain sets in, tissue damage may already be significant.
Immediate steps after skin contact
Rinse the affected area with large amounts of water for at least 15 minutes. Remove contaminated clothing carefully, avoiding contact with bare hands. Do not delay rinsing, even if discomfort seems mild.
Seek medical attention immediately. Bring the product’s safety data sheet (SDS) if available. Do not use home remedies like vinegar or milk, these are ineffective and can worsen the injury.
Protective gear that actually works
Not all gloves protect against peracetic acid. Latex and nitrile gloves degrade quickly and offer little defense. Only butyl rubber or laminated chemical-resistant gloves (tested to ASTM F739) provide reliable protection for extended handling.
Gloves must be replaced regularly, aged gloves may look intact but lose protective qualities. Face shields are also important, as splashes to the face can expose skin, eyes, and airways.
Risks from diluted solutions and repeated exposure
Even at 5–8% concentrations, peracetic acid can cause chronic dermatitis with frequent contact. Workers in wastewater or food processing may develop cracked skin, pigmentation changes, or loss of fingerprint ridges over months of use.
This slow damage is often mistaken as harmless because symptoms build gradually. The idea that diluted means safe is a dangerous misconception, low-level exposure still harms skin integrity over time.
Inhalation and vapor exposure
Peracetic acid releases vapors, especially in warm or poorly ventilated areas. These vapors can irritate the eyes, nose, throat, and lungs, causing coughing, chest tightness, or burning sensations.
Because the vapor is heavier than air, it accumulates near the floor, putting kneeling workers at higher risk. Repeated inhalation may lead to bronchitis or reactive airway dysfunction syndrome (RADS), a permanent asthma-like condition.