 It is the owner of technology and a major manufacturer of isocyanates, particularly toluene diisocyanate (TDI), hexamethylene diisocyanate (HDI, IPDI) and its derivatives.The 2009 Montara oil spill, 250 km off Australia's northwestern coast led to "Thousands of barrels of oil gushed into the ocean over a 10-week period following a blowout at PTTEP Australasia's West Atlas rig in the Timor Sea".The Australian unit of PTT Exploration and Production (PTTEP) "admitted to four charges" in the 2009 spill.