Fire crews were called to the United Parcels services site in Dutton Lane this morning after six members of staff suffered chemical burns.
Five men and one woman needed medical treatment after they discovered a chemical substance in the back of a truck at the parcel depot.
The Crews were called just after 7 am and the material was identified as an industrial cleaning product.
They decontaminated the casualties who were then taken to the General hospital.
By 9 am the scene was declared safe.