- Tantalum

- Niobium

- Molybdenum

- Zirconium

- Titanium

Non-metals

- Ceramics

- Glass

- Plastics (like polyethylene, polypropylene, and PVC)

- Rubber

- Teflon

- Glass-lined steel.

Note: The concentration and temperature of the hydrochloric acid will affect the materials' ability to withstand it.