DUBAI, June 18 (Reuters) - Iran has restored about 89% of petrochemical units that were knocked offline during the war with Israel and the U.S., the head of the country's largest petrochemical holding group said on Thursday, according to the Iranian Student News Agency.

Mohammad Shariatmadari, chief executive of Persian Gulf Petrochemical Industries Company, said disrupted facilities had returned to production following what he described as rapid reconstruction efforts, with some units operating above nominal capacity, while others had yet to reach full output.

Iran introduced a ban on petrochemical exports in April to ensure domestic supply after its petrochemical sector production was disrupted by Israeli strikes hitting utilities companies that provide feedstock for petrochemical plants.