The Irish Congress of Trade Unions is calling on the public to take part in a march in Cork city later in support of the Vita Cortex workers.
Large crowds are expected at the demonstration which gets underway at 1.30pm from the city's Connolly Hall.
Thirty-two former workers were not paid redundancy when the foam manufacturing plant in Ballyphehane closed in mid-December and have been staging a sit-in protest at the facility ever since.
SIPTU spokesperson Anne Egar said the workers' campaign has captured the sympathy of the nation.
"I think that their dignity has been an example to everyone around the country," she said.
"Their story has certainly resonated with people.
"We would expect supporters to come out and - just for an hour - to show their support for them."