WASHINGTON (Agencies) - The former boss of a US companys Chinese subsidiary Tuesday pleaded guilty to illegally supplying material to Pakistan for use in a nuclear reactor and is now cooperating with US investigators. US prosecutors said that Xun Wang, a Chinese citizen and lawful US permanent resident, faces up to five years in jail and a fine of $250,000 for conspiring to violate US law by sending the high-quality paint coatings to Pakistan via China after being refused a US export licence. Her plea before US District Judge Emmet Sullivan allows her to escape more serious charges she was facing that could have carried up to 65 years in prison. No sentencing date was set. At the end of last year, the Chinese subsidiary of a US company pleaded guilty to illegally exporting high-performance coatings for use in a Pakistani nuclear reactor, said US Attorney Ronald Machen in Washington. Today we are pleased to see the former managing director of that subsidiary accept responsibility for her role in the crime. We also welcome the defendants decision to cooperate with the government in our ongoing investigation of this blatant violation of US export laws. Wang, 51, the ex-managing director of PPG Paints Trading (Shanghai) Co Ltd, pleaded guilty to conspiring to export and ship high-performance epoxy coatings to the Chashma 2 Nuclear Power Plant in Pakistan (Chashma II) through a third-party distributor in China without the required licence from the US Commerce Department. Some US experts say there is evidence Pakistan is building a plant near Chashma II to turn spent fuel from the reactor into weapons grade plutonium. for the countrys expanding nuclear arsenal. The facility is run by the Pakistan Atomic Energy Commission (PAEC), the science and technology organisation responsible for Pakistans nuclear programme, including the development and operation of atomic power plants. In November 1998, following Pakistans first successful detonation of a nuclear device, the US Commerce Department added the PAEC to the list of banned end-users of such goods under American export regulations. Wang has already paid a separate $200,000 penalty in connection with her case. According to her plea documents, in January 2006, PPG Industries sought an export licence for the shipments of coatings to Chashma II. In June 2006, the US Department of Commerce denied the application. But Wang and her co-conspirators then agreed upon an illegal scheme to export and ship PPG Industries high-performance epoxy coatings from the United States to Chashma II, via a third-party distributor in China. Wang, who hails from Hillsborough, Calif., was arrested at Atlantas Hartsfield-Jackson airport this summer as she and her family were headed to Italy to celebrate her oldest daughters graduation from prep school before starting Princeton. Her lawyers initially argued that charges against her were technical, that she was at worst peripherally involved in the scheme and that the case involved paint, not any threat to American security or nuclear proliferation. Wang, who has a doctorate in physics from the University of California, Santa Cruz, and her husband ran their own paint import-export business. The couple, who have two daughters, sold it to PPG Industries in 2006 for more than $17 million, and the US company hired her to run its wholly-owned Chinese subsidiary. A short time later, prosecutors say, the US government rejected an application from PPG for a licence to sell paint to an unnamed government-owned Chinese company, for use on the steel lining of the containment area of Chashma II. So PPG officials said the coatings were to be used at a nuclear power plant in China, where exports dont require a licence from the Commerce Department.