The incident occurred this evening at Gokulpadu village in Visakhapatnam district between 4:30 pm and 5 pm under S Rayavaram police station limits, district Superintendent of Police, K Pravin said.
"Five bodies were recovered from the spot. Nine others were injured, of which condition of four persons is critical," the SP told PTI over phone.
Most of the deceased are women working at the unit, he said.
The exact reason behind the explosion and the subsequent fire was yet to be ascertained, though district fire officer is probing into the reasons, the officer said.
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The injured were rushed to a nearby hospital.
Narasipatnam DSP, Yesu Babu, who rushed to the spot and was monitoring relief and rescue operation, said four bodies were charred.
"There was a sudden explosion at the unit and the workers died due to the impact of the blast and burn wounds," he said.