The Labour Court is expected to rule on the terms of a redundancy package offered to workers at Cameron in Longford town.
It follows unsuccessful attempts by union officials and the company to resolve the issue at a Workplace Relations Commission meeting on March 30.
The Aughafad based firm wants to cut around 45 jobs as falling oil prices and reduced drilling activity continues to hamper international markets.
It's believed up to 20 employees have already left the firm with hopes that the remaining redundancies can likewise be agreed on voluntary grounds.
Unite Regional Officer, Willie Quigley said despite progress having been made in a number of areas, differences still remain.
“The company have agreed that if more beneficial redundancy terms are decided upon at a later stage, they will apply them retrospectively to anyone that has left,” he said.
Mr Quigley said one of the key stumbling blocks between the company and union officials surrounds the present terms of those conditions.
“We (Union) have a number of issues,” he added.
“What we want to avoid at all costs is any compulsory redundancies and the (redundancy) package on offer of statutory (two weeks' pay per year of service) plus one week (per year of service) - workers are not happy with.”
It's expected the hearing is likely to be heard by the Labour Court before the end of the month.