SIPTU officials are meeting with Element Six representatives at the Shannon plant to begin talks on improving the redundancy package offered to workers yesterday.
The company announced is laying off 370 of its 450 strong workforce, with the manufacturing and distribution sections to close by next December.
Element Six, formerly known as De Beers, supplies diamond supermaterials used for a wide range of activities in the oil and gas, car, construction and mining industries.
SIPTU organiser Mary O'Donnell has condemned the offer made to workers, describing it as completely unsatisfactory.
The company has offered one week's pay for every year of service. In a redundancy drive last December, workers were offered six weeks pay for each year of service.
Ms O'Donnell said workers are extremely angry and disappointed at the offer, and would need more than six weeks - not less - in the current economic climate, when alternative employment is almost impossible to maintain.
She added that some of the workers were there over 30 years, and the current offer was poor reward for that commitment.
