ESSEN, Germany (Reuters) - IG Metall, Germany's largest union, has called for a 10-year guarantee for jobs, sites and investments at Thyssenkrupp's (>> ThyssenKrupp) steel business as a condition for agreeing to a planned merger with Tata Steel (>> Tata Steel Limited).

"We call for a decade of security for employment, locations, factories and investments. That's what it will be about in subsequent negotiations," Detlef Wetzel, deputy supervisory board chairman of Thyssenkrupp Steel Europe, said on Thursday.

He was presenting IG Metall's demands during a demonstration of workers at Thyssenkrupp's tin plate production site in Andernach.

(Reporting by Tom Kaeckenhoff; Writing by Christoph Steitz; Editing by Douglas Busvine)

Stocks treated in this article : ThyssenKrupp, Tata Steel Limited