Demand for platinum and palladium outstripped supply in 2012, and both markets look set to remain in deficit in 2013, specialty chemicals company Johnson Matthey PLC (JMAT.LN) said Monday.

In its annual market review, Johnson Matthey said gross demand for platinum fell 0.6% to 8.045 million ounces in 2012, while supply--hit by a series of labor strikes in South Africa's mining sector--fell 13% to 5.64 million ounces. When accounting for other supply and demand factors, such as additional supply of the metal from recycling, the platinum market was left in a deficit of 375,000 ounces last year, Johnson Matthey said.

Gross demand for palladium, meanwhile, rose 15.6% to 9.895 million ounces, against an 11.1% drop in supply to 6.545 million ounces. Overall, the palladium market registered a deficit of 1.07 million ounces.

Johnson Matthey expects platinum to trade in a range of $1,415 a troy ounce to $1,710/oz over the next six months, averaging $1,570/oz. Palladium should trade between $635/oz and $830/oz, averaging $740/oz, it said.

The main driver of platinum's supply deficit last year was a sharp drop in supply of the metal from top platinum producer South Africa, where a series of violent mining strikes resulted in a sharp drop in platinum production and the loss of 50 lives. Supply of platinum from the country fell last year to its lowest level since 2001, at 4.095 million ounces, as over 750,000 ounces of platinum production was lost due to strikes, said Johnson Matthey.

South African mining companies have been under pressure in recent years from rapidly rising costs that made some mines unprofitable. The threat of mine closures and related job losses have led to strikes and government mediation.

Anglo American Platinum Ltd. (AMS.JO), the world's biggest platinum producer, Friday said it is proposing to reduce annual production by about 20% amid oversupply in the platinum market and cut 6,000 jobs in a move to return to profitability within the next two years.

This year, supply of platinum from South Africa is likely to remain constrained, pressured by weak producer margins and unstable labor relations at the country's mines, Johnson Matthey said. This, combined with expectations for steady growth in investment demand for the metal, should see the market register a slight deficit, it said.

"This year's platinum market balance will come down to what happens in supply and physical investment," Peter Duncan, general manager of market research at Johnson Matthey told The Wall Street Journal in an interview.

"Platinum's supply-side looks set for difficult times because you've got these two [South African] unions battling for rivalry, both wanting to show themselves to be strong," he said. "There's certainly a recipe for trouble. And on top of that the South African energy crisis seems to be peaking again."

On the demand side, physical investment in platinum looks likely to remain solid this year, Mr. Duncan added.

The slight fall in platinum demand last year was driven by a sharp drop in industrial usage of the metal--in the glass industry, for instance--which fell 20.5% to 1.570 million ounces in 2012. This outweighed a strong increase in platinum demand from the jewelry sector, which rose 12.3% to 2.78 million ounces. Gross demand for platinum in the autocatalyst sector--which accounts for 40% of overall demand for platinum, which is used in the catalysts that scrub fumes from the exhaust of diesel-fueled vehicles--rose 1.7% to 3.24 million ounces, while investment demand for the metal fell 1.1% to 455,000 ounces.

The supply shortfall in the palladium market, meanwhile, was driven by record demand for the metal in the autocatalyst sector, a major uptick in investment demand and lower supply of the metal to the market. Demand for palladium in the auto sector--where the metal is mainly used in autocatalysts in gasoline-fueled vehicles--accounted for 67% of gross palladium demand last year.

Gross demand for palladium in autocatalysts rose 7.5% in 2012 to 6.615 million ounces, while investment demand--driven by renewed interest in palladium exchange-traded funds--swung into positive territory at 470,000 ounces. In 2011, investment demand for palladium was negative, with 565,000 ounces of the metal sold overall.

Demand for palladium in the jewelry sector fell 11.9% to 445,000 ounces and industrial demand dropped 4.1% to 2.365 million ounces.

Johnson Matthey expects the palladium market to remain in deficit this year as sales of the metal from Russian state stockpiles--which were built up during the Soviet era--dwindle and autocatalyst demand continues to grow.

Write to Francesca Freeman at francesca.freeman@dowjones.com

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