PolyEthylene plants of IOCL are likely to undergo maintenance by Indian Oil Corp. The units are based in Panipat in Haryana. According to company sources the plants will be shut down in the first week of July and will remain off-stream for around one month. The units has the manufacturing capacity of HDPE around 3,00,000 mt/year and LDPE around 1,75,000 mt/year.