Engineers and maintenance workers at St Helens glass giant NGF have announced plans to strike after being "treated as second class employees".
Unite and GMB Union members employed at the St Helens site will stage two 48-hour strikes next month, starting July 2 and July 14 - and have vowed further strikes if the pay dispute is not resolved.
It comes after workers were offered a 5.65% pay rise plus an £800 bonus, which is lower than offers received by their colleagues at nearby sites.
