Aditya Birla Group firm, Hindalco Industries, on Wednesday declared a lock out at its Alupuram plant in Kerala in the wake of protest by workers.

In a filing to the BSE, the company said that due to protracted acts of indiscipline by workmen at our Alupuram Plant, the company was forced to declare a lock out there.”

Alupuram plant is situated in Ernakulam district and the country’s first aluminium ingot was produced here in 1943, according to the company’s website.

Hindalco operates an extrusion unit, set up in 1955, in the plant with an annual capacity of 8,000 tonnes per annum.

The unit is equipped with two extrusion presses, solutionising furnaces and heat treatment facility. It also has a packing facility.

Alupuram has 300-odd strong multi skilled workforce, the website revealed.

Hindalco, however, does not expect any adverse impact on the company’s financials due to the lock out.