Standard high-density polyethylene is an electrical insulator. That helps HDPE totes resist chemistry that would corrode metal. For flammable liquids, it is a liability, because static electricity can build up and ignite vapor.
The static charge problem
Liquid flowing through pipes and hoses builds static charge. In a grounded metal vessel, the charge drains away. In an insulating plastic vessel, it has nowhere to go and can accumulate on the liquid and the container.
For non-flammable liquids, this is usually just a nuisance. For flammable liquids, a static discharge can ignite vapor.
The conductive solution
Conductive or static-dissipative IBCs use plastic with conductive additives, often carbon black, so charge can flow to the cage and from there to ground. These bottles are usually black rather than white.
When to consider it
For flammable or combustible liquids, or where your own safety policy requires static-dissipative containers. Proper bonding and grounding during filling and draining still matters.
Check the rules
Whether a plastic IBC is permitted for a particular flammable liquid depends on fire codes, DOT/UN rules and your site’s own requirements. Check current regulations and your fire-safety guidance before using any IBC for flammables, and tell the partner supplier exactly what you plan to store.