The forklift driver quickly backed down the ramp with the drum still on the forks and headed for the secondary containment unit, which another driver picked up and brought towards him.
The broken drum was then placed in the other container.
Mr Travis said about 100 litres of caustic soda spilled before it could be contained. About 200 litres of the substance remained in the original drum but the rest had spilt over into the secondary container.
"The whole container was punctured. A lot of it was saved by the forklift driver getting it around to that secondary containment really quickly," he said. "It was a good, helpful thing to do, otherwise it would have been all over the floor."
Mr Travis said some of the caustic soda splashed on to one man's leg and another got it on his arm.
"It's soapy. It will stick on you and it's hard to wash off."
The pair were decontaminated by the fire service before being taken to hospital by ambulance.
They were discharged the same night and one of the men was back at work yesterday, Mr Travis said.
The substance, called Rezolv, is made of about 45-50 per cent caustic soda, compared to Janola, which contains about 5 per cent, he said.
Mr Travis said the fire service used sand to clean up the spill and neutralised the rest with citric acid powder.
The contaminated sand and the remaining contents of the punctured drum were picked up yesterday and taken to be disposed of correctly.
Firefighters remained on the scene for more than three hours.
