A comprehensive reference for which chemicals are safe to store in standard HDPE IBC totes, and which require special materials or liners.
Storing the wrong chemical in an IBC tote can have consequences ranging from a slowly degrading bottle that fails during transport to a catastrophic rupture that releases hundreds of gallons of hazardous material. Standard composite IBC totes use a blow-molded HDPE (high-density polyethylene) inner bottle, which offers excellent resistance to many chemicals but has definite limits. This guide provides a comprehensive chemical compatibility reference for HDPE IBC totes, organized by chemical category, along with guidance on liners, temperature effects, and the chemicals you should never put in a standard tote.
Understanding HDPE Chemical Resistance
High-density polyethylene is a semicrystalline thermoplastic with a simple molecular structure — long chains of repeating ethylene units packed tightly together. This simplicity is its strength: HDPE has no ester bonds to hydrolyze, no aromatic rings to attack, and no functional groups for most chemicals to react with. It is essentially a solid wax at the molecular level, and like wax, it is inert to water, most acids, most bases, and most salts. Where HDPE runs into trouble is with chemicals that can penetrate between the polymer chains and cause swelling, softening, or stress cracking — primarily organic solvents, strong oxidizers, and certain halogens.
Chemical compatibility is not a simple yes/no question. It depends on concentration, temperature, exposure duration, and whether the tote is under mechanical stress (such as being stacked or transported over rough roads). A chemical that is perfectly compatible at 20 degrees Celsius and 10 percent concentration may attack HDPE aggressively at 60 degrees Celsius and full concentration. The compatibility ratings in this guide assume ambient temperature storage (15-30 degrees C) unless otherwise noted. For elevated-temperature applications, always consult the chemical manufacturer and the tote manufacturer for specific guidance.
Critical: This guide is a general reference, not a substitute for formal compatibility testing. Always verify compatibility with the chemical manufacturer's data and, when in doubt, request a sample coupon test from the tote manufacturer. The consequences of a compatibility failure can be severe — environmental damage, injury, and regulatory penalties.
Acids: What HDPE Can and Cannot Handle
HDPE is one of the best materials available for acid storage, outperforming most metals and many other plastics across a wide range of acid types and concentrations. Here is a breakdown by specific acid.
Compatible Acids (Safe for HDPE IBCs)
- Hydrochloric acid (HCl): Compatible at all concentrations up to 37% (concentrated). HDPE is the material of choice for muriatic acid storage.
- Sulfuric acid (H2SO4): Compatible up to approximately 70% concentration at ambient temperature. Above 70%, the acid becomes a strong oxidizer and will slowly attack HDPE.
- Phosphoric acid (H3PO4): Compatible at all concentrations up to 85%. Widely stored in HDPE IBCs for agricultural and food-processing applications.
- Acetic acid (CH3COOH): Compatible at all concentrations including glacial (99.7%). Vinegar, cleaning solutions, and industrial acetic acid are all safe in HDPE.
- Citric acid: Compatible at all concentrations. Commonly stored in HDPE for food, beverage, and cleaning applications.
- Hydrofluoric acid (HF): Compatible at concentrations up to 60%. HDPE is actually one of the few materials that resists HF, which attacks glass and most metals.
- Boric acid: Compatible at all concentrations.
- Formic acid: Compatible up to approximately 90% concentration.
Incompatible or Limited-Compatibility Acids
- Nitric acid (HNO3): NOT compatible above 50% concentration. Nitric acid is a powerful oxidizer that attacks the polymer chain at higher concentrations. Below 30%, compatibility is generally acceptable for short-term storage, but long-term exposure even at low concentrations can cause embrittlement.
- Sulfuric acid above 70%: Becomes oxidizing and will degrade HDPE. Use fluorinated HDPE or stainless steel for concentrated sulfuric.
- Chromic acid (H2CrO4): NOT compatible. Strong oxidizer that rapidly degrades HDPE.
- Perchloric acid (HClO4): NOT compatible. Extremely aggressive oxidizer.
- Oleum (fuming sulfuric acid): NOT compatible. Will melt through HDPE rapidly.
Bases and Alkalis
HDPE has outstanding resistance to bases and alkalis across virtually the entire concentration and temperature range encountered in industrial use. This makes HDPE IBCs the default container for caustic soda, potash, ammonia solutions, and other alkaline products.
- Sodium hydroxide (NaOH / caustic soda): Compatible at all concentrations up to 50% including hot solutions. One of the most commonly stored products in HDPE IBCs worldwide.
- Potassium hydroxide (KOH): Compatible at all concentrations up to 50%.
- Ammonium hydroxide (NH4OH): Compatible at all concentrations. Ammonia solutions up to 30% are routinely stored in HDPE.
- Calcium hydroxide (slaked lime slurry): Compatible. The abrasive particulates in the slurry are more of a concern for valve wear than for bottle compatibility.
- Sodium hypochlorite (bleach): Compatible at concentrations up to about 12.5% (industrial strength). Higher concentrations are oxidizing and will slowly degrade HDPE over extended storage periods. For pool-grade 12.5% bleach, plan on a maximum storage life of 6-12 months in HDPE.
- Sodium carbonate (soda ash): Compatible at all concentrations.
- Sodium silicate (waterglass): Compatible at all concentrations.
Organic Solvents: The Danger Zone for HDPE
Organic solvents are where HDPE runs into its most significant limitations. Many solvents can penetrate into the HDPE matrix, causing the bottle to swell, soften, and lose structural integrity. The mechanism is not a chemical reaction — it is physical absorption. The solvent molecules are small enough and sufficiently nonpolar to work their way between the polyethylene chains, disrupting the crystalline structure and causing dimensional changes. The severity depends on the solvent's molecular structure and its solubility parameter relative to HDPE.
Compatible Solvents
- Isopropyl alcohol (IPA): Compatible at all concentrations. One of the most commonly stored solvents in HDPE IBCs.
- Ethanol: Compatible at all concentrations including anhydrous (200 proof). Widely used for hand sanitizer production during and after the COVID-19 pandemic.
- Methanol: Compatible at all concentrations, although long-term storage at elevated temperatures (above 40 degrees C) can cause slight swelling.
- Ethylene glycol and propylene glycol: Compatible. Antifreeze, coolant, and de-icing fluids are routinely stored and shipped in HDPE IBCs.
- Glycerin (glycerol): Compatible at all concentrations.
- Acetone: Limited compatibility. Short-term storage (days to weeks) is acceptable, but long-term storage will cause swelling and softening. Not recommended for storage exceeding 30 days.
Incompatible Solvents (Do Not Use Standard HDPE IBCs)
- Toluene: NOT compatible. Causes rapid swelling and softening of HDPE. The bottle can deform within days.
- Xylene: NOT compatible. Similar behavior to toluene — rapid penetration and swelling.
- Benzene: NOT compatible. Highly aggressive to HDPE. Also a known carcinogen requiring special handling.
- Methylene chloride (dichloromethane): NOT compatible. This chlorinated solvent will soften and eventually dissolve HDPE.
- Trichloroethylene (TCE): NOT compatible. Aggressively attacks HDPE.
- Tetrahydrofuran (THF): NOT compatible. Rapidly swells and softens HDPE.
- MEK (methyl ethyl ketone): NOT compatible for extended storage. Causes swelling and eventual failure.
- Gasoline and diesel fuel: Limited compatibility. Short-term storage (hours to days) is acceptable for emergency situations, but long-term storage will cause the HDPE bottle to swell, become permeable, and eventually fail. Use fluorinated HDPE or metal containers for fuel storage.
Warning: If you need to store aromatic or chlorinated solvents in IBC format, consider a fluorinated HDPE bottle (where the inner surface has been treated with fluorine gas to create a chemical barrier) or an all-stainless-steel IBC. Never store these solvents in standard untreated HDPE — the consequences include bottle failure, product loss, and potential environmental contamination.
Oils, Fuels, and Petroleum Products
Mineral oils, vegetable oils, and light petroleum products have a complex relationship with HDPE. Pure vegetable oils (soybean, canola, corn, palm) are generally compatible with HDPE at ambient temperatures, though they can cause very slow permeation over many months, leading to a slight oily residue on the outside of the bottle. Mineral oils and hydraulic fluids are compatible at ambient temperatures but can cause slight swelling at elevated temperatures. Motor oil is compatible for storage but may leave a permanent odor in the HDPE that makes the bottle unsuitable for food-grade reuse afterward.
For fuel storage — gasoline, diesel, kerosene, jet fuel — standard HDPE is not recommended for extended periods. These lighter hydrocarbons permeate through the bottle wall and can cause gradual swelling. Fluorinated HDPE bottles are the solution for fuel storage in IBC format. The fluorination process creates a thin fluoropolymer barrier on the inner surface of the bottle that dramatically reduces permeation rates, making the container suitable for hydrocarbon storage. Fluorinated IBCs are available from major manufacturers and are identifiable by a blue or dark-colored inner bottle or a specific marking indicating fluorination.
Liner Options for Incompatible Chemicals
When a chemical is not compatible with HDPE but you still want to use the IBC format for its handling advantages, liner systems provide an effective barrier between the product and the bottle. Liners are thin bags installed inside the IBC bottle that prevent direct contact with the HDPE. They are single-use items that are replaced between fills.
- LDPE (low-density polyethylene) liners: The most economical option. Similar chemical resistance to HDPE but slightly better flexibility. Suitable for aqueous products, mild chemicals, and food ingredients.
- Nylon (PA) liners: Excellent barrier properties against hydrocarbons and many organic solvents. Good choice for essential oils, fragrances, and light petroleum products.
- EVOH (ethylene vinyl alcohol) multi-layer liners: Premium barrier liners with exceptional resistance to solvents, fuels, and flavor/odor-sensitive products. Multiple polymer layers provide both chemical resistance and mechanical strength.
- Foil laminate liners: Aluminum foil sandwiched between polymer layers provides an absolute barrier against all chemicals, moisture, and gases. Used for the most demanding pharmaceutical and specialty chemical applications.
- Fluoropolymer (PTFE/FEP) liners: The most chemically resistant liner option, suitable for virtually all chemicals except molten alkali metals. Extremely expensive and typically reserved for ultra-aggressive products.
Temperature Effects on Compatibility
Temperature is the great multiplier in chemical compatibility. A chemical that is rated as compatible with HDPE at 20 degrees Celsius may become problematic at 50 degrees and aggressive at 80 degrees. As temperature increases, the HDPE polymer chains gain mobility, the crystalline regions begin to soften, and solvent molecules can penetrate more easily. As a general rule, every 10-degree increase in temperature doubles the rate of chemical attack.
Standard HDPE IBC bottles are rated for continuous service up to about 60 degrees Celsius (140 degrees Fahrenheit). Short-term exposure to 80 degrees Celsius is tolerable for compatible chemicals, but the bottle will begin to soften and deform under load at these temperatures. For hot-fill applications where the product is above 60 degrees Celsius when it enters the tote, consult the tote manufacturer for high-temperature HDPE formulations or consider stainless steel IBCs.
On the cold side, HDPE remains functional down to about minus 50 degrees Celsius, but it becomes increasingly brittle below minus 20 degrees Celsius. Totes stored outdoors in Indiana winters (where temperatures can reach minus 20 degrees Celsius) are at risk of impact-induced cracking if struck by a forklift or dropped while at low temperature. The chemical inside does not change its compatibility at low temperatures, but the physical properties of the container itself are affected.
Environmental Stress Cracking
Environmental stress cracking (ESC) is a failure mode unique to plastics where a combination of mechanical stress and chemical exposure causes cracks to form even though neither the stress alone nor the chemical alone would cause failure. ESC is the leading cause of HDPE container failures in chemical storage applications. The chemicals most associated with ESC in HDPE include certain surfactants (especially nonylphenol ethoxylates), silicone oils, some emulsifiers, and some agricultural adjuvants.
The risk of ESC is highest at points of high residual stress in the bottle — typically around the valve fitting area, at fold lines from the blow-molding process, and at any point where the bottle contacts the cage during handling or transport. Reconditioned totes may have higher residual stress than new totes due to their service history, so ESC risk is slightly elevated. If your product is known to cause ESC, specify a new bottle or a bottle made from an ESC-resistant HDPE formulation.
Pro Tip: The best way to test for ESC risk is the ASTM D1693 bent-strip test. If your chemical supplier cannot provide ESC test data for their product in contact with HDPE, request a sample coupon from the tote manufacturer and conduct your own immersion test at the expected service temperature for a minimum of 30 days.
Quick Reference: Common Industrial Chemicals
Below is a quick-reference list of commonly stored industrial chemicals and their compatibility with standard HDPE IBC totes at ambient temperature. This list uses a three-tier rating: Compatible (safe for long-term storage), Limited (acceptable for short-term storage or at reduced concentrations), and Incompatible (do not use standard HDPE).
- Water (all grades): Compatible
- Sodium hydroxide (up to 50%): Compatible
- Hydrochloric acid (up to 37%): Compatible
- Sulfuric acid (up to 70%): Compatible
- Phosphoric acid (up to 85%): Compatible
- Nitric acid (up to 30%): Limited — use below 50% only, not for long-term
- Isopropyl alcohol: Compatible
- Ethanol: Compatible
- Hydrogen peroxide (up to 35%): Limited — higher concentrations are oxidizing
- Sodium hypochlorite (bleach up to 12.5%): Compatible for 6-12 months
- Diesel fuel: Limited — fluorinated HDPE recommended
- Gasoline: Incompatible — use fluorinated HDPE
- Toluene: Incompatible
- Xylene: Incompatible
- Acetone: Limited — short-term only
- Urea solution (DEF/AdBlue): Compatible
- Glycerin: Compatible
- Ethylene glycol: Compatible
- Vegetable oils: Compatible
- Detergent concentrates: Compatible — verify no ESC-causing surfactants
At Fort Wayne IBC Recycling, we label every reconditioned tote with the product it previously contained, so you can make informed compatibility decisions. If you are unsure whether a reconditioned tote is suitable for your specific chemical, contact us with the product name and SDS, and we will help you determine the right container for your application.