Workers at Element Six in Shannon have served notice of strike action over work practices and shift patterns at the facility.
They served management with notice of a 24-hour work stoppage which will take place on Wednesday, September 21, from 6.30am.
The union representing workers at the plant, Siptu, said workers had voted last month for industrial action because of "the failure of management to fully implement a Labour Court recommendation" in relation to changes of work practices and shift patterns there.
Siptu organiser, Ray Mitchell, said: "Since then, there has been no attempt by management to engage with our members to discuss the issues that have resulted in this dispute.
"Siptu representatives remain available to meet with management to engage in serious negotiations to find a solution to the outstanding issues.
"If management was to engage in negotiations with our members that were really aimed at finding a resolution to the issues in dispute, the upcoming action could yet be averted. It is now up to management to show its willingness to focus on resolving this dispute."