Birute Daskeviciene, chairwoman of Achema's trade union, told BNS on Monday evening that about 600 people, or almost half of the company's workforce, were expected to take part in the strike action scheduled to start at 8 a.m. on Tuesday.
"The strike will continue until a collective agreement is signed," she said.
Achema CEO Ramunas Miliauskas said on Tuesday morning that the company was not planning to close down the plant in Jonava, in central Lithuania, during the strike.
"We will not halt production, and if we have to, it will be done safely," he told LRT Radio.
Ahead of the strike, neither the employer nor the union were willing to compromise. Miliauskas refused to sign a collective agreement, and the union's representative said workers would strike indefinitely.
The company said earlier that it had increased the wage bill for 2021, created an additional bonus fund, and promised a 3.5 percent pay rise for production staff. The management calls the union leaders' activities destructive.
According to data from the state social insurance fund Sodra, monthly salaries in Achema averaged 2,300 euros before taxes in late 2021.
Currently, about 37 percent of Achema's 1,300 employees are members of the trade union.