Dec. 22 (Bloomberg) --Copper advanced for a fourth day from London to Shanghai as the demand outlook continued to improve amid supply disruptions in Chile, the world’s largest producer of the metal used in cars and household appliances.

The metal for three-month delivery on the London Metal Exchange rose as much as 0.3 percent to $9,390 a metric ton, and traded at $9,370 by 9:05 a.m. Singapore time. It reached a record $9,392 a ton yesterday.

Futures on the Comex in New York were little changed at $4.2780 a pound, after touching an all time high of $4.2965 earlier. Copper for March-delivery on the Shanghai Futures Exchange gained as much as 1.1 percent to 70,000 yuan a ton.