Is polyurethane toxic and harmful?

Polyurethane is toxic, but under normal circumstances it does not cause harm to the human body. However, if ingested or inhaled in large quantities, it may have certain adverse effects, primarily causing respiratory tract damage or skin injury, and may even lead to eye discomfort.

1. Respiratory Damage

Inhaling or ingesting high concentrations of polyurethane may trigger type I, type III hypersensitivity reactions, or cellular immune responses in the body, leading to symptoms such as rapid breathing or wheezing. In severe cases, it may result in difficulty breathing and potentially induce diseases such as bronchitis, bronchopneumonia, or even pulmonary edema. It may also trigger asthma or hypersensitivity pneumonitis.

2. Skin Damage

Prolonged skin contact with polyurethane may likely cause skin damage, including rashes or redness and swelling. Individuals with allergic constitutions may develop skin allergies upon exposure, such as hives or eczema.

3. Eye Damage

At high temperatures, polyurethane can release toxic gases that may irritate the eyes upon contact, potentially causing conjunctivitis. Symptoms typically include eye soreness or pain, and may also involve bloodshot eyes or swelling.

If a large amount of high-concentration polyurethane vapor is accidentally inhaled, immediately move to a well-ventilated area. If symptoms are severe or significant physical discomfort occurs, seek prompt medical evaluation at a reputable local hospital and receive treatment under a physician's guidance.