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The union's Troy Baker says there is still no resolution after six months of negotiations.
"Our figures indicate that production's gone up by approximately 25 per cent, that's through stock numbers going through the plant, and with an increase of 25 per cent in production we believe that a wage increase of two and a half per cent isn't really feasible," he said.
"I think it's just gonna (sic) find it hard to get newcomers into the industry."
He says union members will strike all day Friday and impose an ongoing ban on overtime.
Greenham is yet to comment.