Aluminum prices hit six-week peaks on Thursday as data showing lower output in China reinforced expectations of tighter supplies.
Rising stocks in top producer China capped gains, however.
Benchmark aluminum prices on the London Metal Exchange closed up 1.2 percent at $2,148 a tonne, its highest since Nov 7.
Prices of the metal, used widely in transport and packaging, are up more than 25 percent so far this year as markets have factored in falling output in China, where the government has shut down some aluminum capacity to cut pollution.
“A whole range of industrial materials are potentially going to see supply shortages because of the environmental crackdown in China,” said SP Angel analyst John Meyer, adding that fund selling ahead of the year-end would weigh on prices.
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