The Industrial Union, Trade Union Pro and the Federation of Professional and Managerial Staff YTN, have all declared an intention to begin a three-day strike starting next Monday.
In addition, workers in the building and electrical sectors have announced solidarity strikes, bringing the total number of employees embarking on industrial action to nearly 100,000.
In a separate development, electrical workers began a four-week strike on Thursday as a result of a dispute over trade union representation in the workplace.
The strike action was confirmed by the office of national labour conciliator Vuokka Piekkala in a tweet on Thursday afternoon.
"This round of negotiations has ended but it’s still not over yet. All strikes will proceed from 9.12," the conciliator’s office declared.
Extended strike could disrupt petrol delivery
Daily Helsingin Sanomat reported Thursday that in addition to the export sector, the strike could affect the availability of medicines and petrol -- if it continues.
Oil refining company Neste said in a statement issued on Wednesday that a possible continuation of the situation and resulting disruption to fuel deliveries could cripple land, sea and air transportation and at worst could suspend Finnish exports altogether.
"It would affect the operations of rescue officials, the delivery of heating oil and the operations of other industrial facilities, among others," Neste added in the statement.
Technology Finland, the organisation representing employers in the industrial sector, said that the three-day strike will result in production losses of hundreds of millions of euros.
The national conciliator has led discussions between employer and employee representatives regarding a new collective bargaining agreement for the past week. Talks have also been conducted in the technology sector, as well as the chemicals and mechanised forestry industries.
On Thursday the national conciliator said that there were insufficient grounds for a settlement proposal between forestry companies’ representative Finnish Forest Industries and the Industrial Union.
On Monday national labour conciliator Piekkala presented a settlement proposal to industrial worker and employer representatives, but the union rejected it, although Technology Finland was satisfied with the offer.