HDPE (High-Density Polyethylene) is strong, non-reactive, and resists most acids, bases, and solvents. It doesn’t leach into contents, making it ideal for both food and chemical storage. But it’s not good for everything, avoid using it with calcium hypochlorite, potassium permanganate, acetone, or high-proof alcohols. For those, use glass. These substances can break down plastic or leach through it over time. Proper storage includes: Airtight containers Clear labeling Cool, dry, dark environment