The Unite union says that Hanson can expected disruption due to a continuous strike by 13 burners from Monday 8 April.
The dispute is over a reduction in the number of holidays for the burners from 25 to 21 days a year.
Last year, the company transformed working conditions after lengthy negotiations produced a settlement on 24/7 working.
Unite regional officer Tony Ellingford said: “The major issue is the holiday entitlement where 13 burners had a holiday allocation based on the hours they worked which was 25 12-hour shifts, plus eight bank holidays.
“Now management has unilaterally removed four shifts from the burners’ holiday entitlement. Management has erroneously argued that this was all part of the 2012 agreement.
“The burners are incensed by what they had been told by local management. We have tried to discuss this and believe we put forward a potential solution, but the company was not interested. We have also suggested involving the conciliation service, ACAS but management has rejected this avenue to resolve the dispute, as well.”
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