Kiln burners at Hansons Brick near Peterborough have entered the second of six weeks of action to defend their conditions.
The dispute is over the imposition of new contracts. Managers are now trying to run the kilns during the strike.
Brick production is likely to be affected within a week or so. Solidarity visits and donations from the wider union movement are needed.
Strikes at 68 universities
Agency workers would be paid more
A racist Tory bill
Many people are already missing bill payments