Powerful German union IG Metall warned Wednesday it planned warning strikes from next week in the metalworking sector over negotiations for a pay increase.
"Massive warning strikes are the only proper response," Knut Giesler, an IG Metall official for the western region of North Rhine-Westphalia, Germany's most populated and industrialised state, said.
"We want a quick and good solution. Because you only get that with real pressure, we're going to apply real pressure," he said in a written statement.
The union is calling for a 5.5-percent salary rise this year for its 3.7 million metalworkers who are spread across different branches ranging from the automobile sector to electronics.
Several rounds of negotiations have taken place with the employers' federation, Gesamtmetall, which offered Monday a 2.3-percent rise for 11 months from July 1.
IG Metall rejected the offer.
Pay talks in the metalworking sector set the tone for other areas of industry.