** Thirumalai Chemicals NSE:TIRUMALCHM falls 3.5% to 217 rupees
** Commodity chemicals maker says subsidiary facing longer-than-expected outage at its Maleic Anhydride unit due to machinery failure
** Outage expected to reduce consolidated revenue by ~23.5 bln rupees ($260.5 million) annually; unit accounted for 9.6% of FY25 consolidated revenue
** Co reports estimated revenue loss of 11.8 billion rupees in H1 FY26; derivatives plant operations continue
** YTD, THRM falls 32%
($1 = 90.1975 Indian rupees)