HDPE (High-Density Polyethylene) is chosen for IBC bottle construction specifically for its broad chemical resistance. However, "broad" doesn't mean "universal." Certain chemicals will attack, dissolve, swell, or permeate through HDPE, leading to container failure, contamination, or safety hazards.
Generally Compatible (Safe to Store)
The following categories are generally compatible with HDPE IBC totes at ambient temperatures:
Acids (dilute to concentrated): - Acetic acid (vinegar) - Citric acid - Hydrochloric acid (up to 37%) - Phosphoric acid - Sulfuric acid (up to 70%) - Nitric acid (up to 50%)
Bases: - Sodium hydroxide (caustic soda) - Potassium hydroxide - Ammonia solutions - Sodium hypochlorite (bleach)
Alcohols: - Methanol - Ethanol - Isopropanol - Glycerin/glycerol
Aqueous solutions: - All water-based products - Detergents and soaps - Sugar solutions - Salt solutions
Oxidizing agents (dilute): - Hydrogen peroxide (up to 30%)
Generally Incompatible (Do NOT Store)
The following chemicals should NOT be stored in HDPE IBC totes:
Aromatic hydrocarbons: - Benzene - Toluene - Xylene - Styrene
Chlorinated solvents: - Methylene chloride - Carbon tetrachloride - Trichloroethylene - Chloroform
Strong oxidizers (concentrated): - Concentrated nitric acid (>70%) - Chromic acid - Concentrated hydrogen peroxide (>50%) - Fluorine
Other incompatibles: - Bromine - Essential oils (many types attack HDPE) - Some silicone fluids - Concentrated fluorinated compounds
Temperature Matters
Chemical compatibility can change dramatically with temperature. A product that's perfectly safe in HDPE at room temperature may become aggressive at elevated temperatures. General rules: - Up to 73°F (23°C): Standard compatibility data applies - 73-140°F (23-60°C): Some chemicals become more aggressive. Consult specific data. - Above 140°F (60°C): Many chemicals that are safe at ambient become problematic. HDPE itself begins to soften above 180°F.
Signs of Chemical Attack
If you're unsure about compatibility, watch for these warning signs: - Swelling or distortion of the bottle wall - Softening of the plastic - Cracking or crazing on the interior surface - Discoloration or whitening of the HDPE - Product odor detectable outside the container - Weight gain in the container (indicating absorption)
When in Doubt
If your product isn't clearly listed in compatibility charts: 1. Contact the HDPE resin manufacturer for specific compatibility data 2. Perform a small-scale test — immerse a piece of HDPE in your product for 30 days and check for changes 3. Consider stainless steel IBCs for aggressive chemicals 4. Consult us — we've helped hundreds of customers match containers to products