It happened as 59-year-old Sergio Escobar was cutting a metal drum with a grinder at Bactolac Pharmaceutical, a plant that manufactures nutritional supplements on Old Willets Path in Hauppauge.
Suffolk County Police say the drum exploded and struck Escobar at approximately 11:45 a.m.
The Brentwood resident was transported to Southside Hospital in Bay Shore where he was pronounced dead.
The Occupational Safety and Health Administration (OSHA) was notified.
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