WorkSafe has filed charges against PCR, but the regulator could not immediately specify exactly what had been laid under the Health and Safety at Work Act and regulations around hazardous substances.
Court documents show six charges have been laid, including exposing an individual to risk of harm or illness, failing to have an emergency response plan, and failing to ensure a location site plan was in place.
The rest of the charges related to testing failures, safety data, and compliance certification.
At the time of the incident, PCR chief executive Matthew O'Brien said the worker had been processing chemicals that were going to be delivered to its main office in Rolleston, near Christchurch.