The National Union of Workers at Sigma's Herron pharmaceutical plant in Brisbane are reported to launch a strike over some redundancy packages dispute.

The staff at the factory has stopped work at the plant on Monday over pay and entitlements.

Also, the Tennyson plant is due to close this year, however, the National Union of Workers (NUW) is worried about the size of employees' payout when it does.

"They've been offered two and three weeks' pay for every year with the company, but they want four weeks like their fellow workers receive in other states", the union's Queensland representative, Michael Howeg told AAP.

Howeg, revealed that workers on strike had also been told they'll be locked out when their week-long protest ends. In addition, Ms Howeg also extended his concern over the quality control of the pharmaceuticals being emerged during the strike.

"Very, very sadly all the workers on this site are going to lose their jobs and then to not only be made redundant, but for the company not to offer a fair redundancy package has really compounded that emotion", he expressed.