Workers at an under-threat Llanelli car parts factory have begun indefinite strike action after failing to agree redundancy terms.
A picket line formed outside the factory on Wednesday
Dura Automotive Systems is being scaled down from the end of September and is due to shut completely at the end of the year.
The 270 staff are seeking better compensation and redundancy packages, according to a union official.
Dura said closures were "never easy" adding it valued workers' contribution.
Workers at Dura Automotive Systems were told in June that the site was to be earmarked for closure.
Dura, which makes car cable control systems, had earlier blamed competitive market conditions for its decision.
Carl Lucus of Amicus wants better compensation packages
But with the end of the 90-day consultation period approaching, Amicus regional officer Carl Lucas said no compensation has been offered.
The union said the strike was an attempt to force the company to come up with better redundancy and compensation packages.
"They have not been offered anything apart from the minimum statutory payments which they have to make by law," said Mr Lucas.
"We need workers to be compensated for giving the company a smooth rundown.
"We are also looking for enhanced redundancy packages for workers who have given years of loyal service.
"We are still under consultation, there is a minuscule possibility of us being saved - but I doubt it," he said.
Phil Hiorns, who has worked at the plant for 31 years, said: "We are not asking for a substantial package - just a fair one.
"A lot of will find it difficult to find to find work in Llanelli with the way things are at the moment and we are just looking for package to keep us going until we have found work."
Dozens of workers were picketing the factory on Wednesday morning.
Dura has sent in lorries to remove stock so it can still supply customers while the strike continues.
In a statement, released on Wednesday, Dura said: "Today's car manufacturing environment is extremely difficult with excess supply over demand, global competition and hyper-inflationary costs.
"We have been in discussions with Amicus representatives regarding all aspects of the proposed closing of the Llanelli site.
"Site closures are never easy as we value the contributions of all of our dedicated colleagues."