Isothiazolinone is indeed classified as a hazardous material. According to the MSDS in the search results, isothiazolinone has the following GHS hazard categories:
– Acute Oral Toxicity Category 3
– Acute dermal toxicity Category 2
– Skin Corrosion/Irritation Category 1C
– Skin Sensitiser Category 1A
– Acute Inhalation Toxicity Category 2
– Acute Inhalation Toxicity Category 2
– Hazardous to the Aquatic Environment – Acute Hazard Category 1
In addition, it has a number of safety terms and risk terms, including avoid skin contact (S24), flush with plenty of water immediately after eye contact and seek medical advice (S26), wear appropriate protective clothing, gloves, and eye/face protection (S36/37/39), seek medical attention in the event of an accident or if you feel unwell (S45), the substance and its container must be disposed of as a hazardous waste ( S60), Avoid release into the environment (S61). Risk terms include harmful by inhalation, in contact with skin and if swallowed (R20/21/22), causes burns (R34), may cause sensitisation in contact with skin (R43) and is very toxic to the aquatic environment (R50). Therefore, extreme caution is required when storing, using and handling isothiazolinones and appropriate safety measures should be followed.