Aspen Aerogels oven that exploded had open permits, no final inspection

Updated at 1:05 p.m.

AN ACCIDENTAL ethanol vapor buildup in a drying oven caused the explosion at Aspen Aerogels Inc.’s plant Wednesday evening that injured 11 workers. / COURTESY OF CITY OF EAST PROVIDENCE

EAST PROVIDENCE – A drying oven involved in Wednesday’s explosion at Aspen Aerogels Inc. that injured 11 workers had open permits that were never finalized and lacked a final inspection, city officials said Friday, adding a new layer to the ongoing investigation. An accidental buildup of ethanol vapors inside the oven caused the explosion, the R.I.

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