The fire happened at a factory between Phoenix Parkway and Bangrave Road in Corby.
At its height there were ten pumps in attendance and it's believed fire fighters will be on the scene for the rest of the day and into tomorrow.
No-one is thought to have been injured in the blaze.
It's unclear at this time what caused the fire.
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What's happening tonight and when will we know the result?
Friday will be another dry day, and although cloudier than Thursday, some bright or sunny spells and still expected.
Remaining dry with some warm sunny spells, although high cloud will make sunshine rather hazy at times.