Taiwan's CPC Corp has restarted its 380,000 tpa No. 4 naphtha cracker this week following a routine maintenance, but operational rates will be kept low, as per Reuters. The unit was shut in December for maintenance and restarted on Thursday but runs at the unit will stay below full-tilt due to sluggish demand in the Lunar New Year period. CPC has two other crackers, of which the smaller of the three units- a 230,000 tpa No. 3 cracker -- will be shut permanently around April. That would reduce its naphtha demand until it commissions a new 700,000 tpa cracker by end 2012 or early 2013.