Fiberglass is harmful to humans, but there is no evidence of carcinogenicity. The hazards of fiberglass to people include skin hazards, eye and lung hazards. 1. There is no authoritative evidence that glass fiber is carcinogenic, and prolonged contact with large quantities of glass fiber is harmful to the human body. 2. Harm to the skin: prolonged contact with glass fiber can damage human skin causing dermatitis, redness and swelling, pain and other symptoms. 3. Effects on the eyes: prolonged contact with glass fiber can lead to eye conjunctiva redness, pain, photophobia and tearing, can cause conjunctivitis, keratitis and so on. 4. Effects on lungs: prolonged inhalation of glass fiber can appear bronchitis, asthma, patients show coughing and spitting, and even pneumoconiosis. In order to be safe, try not to contact with glass fiber, if contact with glass fiber appeared above symptoms, we must promptly consult a doctor to understand the condition, in accordance with the norms of treatment.