No casualty was reported in the mishap, he said.
The fire broke out around 1 am and spread rapidly in the factory, located in the Maharashtra Industrial Development Corporation (MIDC) area, Kalyan Dombivli Municipal Corporation's (KDMC) chief fire officer Dileep Gund said.
Rubber items kept in the unit aggravated the blaze, he said.
More than six fire engines were rushed to the spot and efforts were still on to douse the flames, Gund said.
Thick smoke and the smell of burning rubber engulfed the entire area, he said, adding that the cause of the fire was yet to be ascertained.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)