IBC Compatibility Guide

Which IBC types work with which chemicals and materials. HDPE resistance ratings, food-grade requirements, UN codes, and gasket compatibility all in one reference.

Why Compatibility Matters

Storing or transporting the wrong chemical in the wrong IBC can lead to container failure, chemical contamination, hazardous leaks, regulatory violations, and serious safety incidents. The inner bottle, gaskets, valve components, and even the cage coating must all be compatible with the stored substance.

The vast majority of composite IBCs use High-Density Polyethylene (HDPE) for the inner bottle. HDPE offers excellent resistance to a wide range of acids, bases, alcohols, and aqueous solutions. However, it has significant vulnerabilities to certain solvents, oxidizers, and aromatic hydrocarbons that can cause swelling, stress cracking, or permeation through the container wall.

This guide provides a comprehensive reference for HDPE compatibility, food-grade requirements, UN certification systems, and gasket/valve material selection. When in doubt, always request a compatibility test from the chemical manufacturer or contact Salt Lake IBC for guidance specific to your application.

HDPE Chemical Compatibility Chart

Resistance ratings for HDPE inner bottles against common industrial chemicals. Ratings are for ambient temperature (68 °F / 20 °C); elevated temperatures significantly reduce chemical resistance.

A = Excellent (recommended) B = Good (minor effect) C = Fair (limited use) D = Not Recommended

Chemical	Concentration	HDPE Rating	Notes
Acetic Acid	Up to 50%	A	Excellent long-term resistance
Acetone	100%	B	Minor swelling over extended exposure
Ammonium Hydroxide	Up to 30%	A	Safe for all HDPE IBCs
Benzene	100%	D	DO NOT USE - causes swelling and permeation
Bleach (Sodium Hypochlorite)	Up to 12.5%	A	Standard for pool/industrial bleach
Calcium Chloride	Saturated	A	No effect on HDPE
Citric Acid	Up to 50%	A	Common food-grade application
Diesel Fuel	100%	B	Slight absorption; use within 6 months
Ethanol	Up to 95%	A	Good for denatured and fuel-grade ethanol
Ethylene Glycol	100%	A	Safe for antifreeze storage
Ferric Chloride	Up to 40%	A	Common water treatment chemical
Formaldehyde	Up to 37%	A	Standard concentration (formalin)
Gasoline	100%	C	Permeation risk; not recommended for long-term
Glycerin	100%	A	No effect on HDPE
Hydrochloric Acid	Up to 37%	A	Excellent for muriatic acid
Hydrogen Peroxide	Up to 35%	B	Slight oxidative effect at higher concentrations
Hydrogen Peroxide	Above 50%	D	Strong oxidizer; may cause stress cracking
Isopropyl Alcohol	100%	A	Safe for IPA storage
Kerosene	100%	B	Slight swelling; acceptable for short-term
Lactic Acid	Up to 90%	A	Common food-grade application
MEK (Methyl Ethyl Ketone)	100%	C	Swelling and softening risk; limited use
Methanol	100%	A	Good for methanol storage
Nitric Acid	Up to 50%	B	Moderate oxidation over time
Nitric Acid	Above 70%	D	Strong oxidizer; will degrade HDPE
Phosphoric Acid	Up to 85%	A	Excellent for all concentrations
Potassium Hydroxide (KOH)	Up to 50%	A	Safe for caustic potash solutions
Sodium Hydroxide (NaOH)	Up to 50%	A	Excellent for caustic soda / lye
Sulfuric Acid	Up to 70%	A	Good for most industrial concentrations
Sulfuric Acid	Above 90%	C	Elevated temperature risk; use with caution
Toluene	100%	D	DO NOT USE - rapid swelling and failure
Urea Solution (DEF)	32.5%	A	Standard DEF/AdBlue concentration
Vinegar (Acetic Acid)	5-10%	A	Standard food-grade application
Xylene	100%	D	DO NOT USE - permeation and swelling

Food-Grade Requirements

What Makes an IBC "Food-Grade"?

A food-grade IBC is not simply a clean container. Every component that contacts the stored product must comply with FDA 21 CFR 177.1520 (for polyolefins like HDPE) and related food-contact material regulations. This includes:

•Inner Bottle: Must be manufactured from FDA-compliant virgin HDPE (not recycled or regrind material)
•Gaskets: Must be FDA-compliant silicone, EPDM, or PTFE. Standard Buna-N gaskets are NOT food-grade
•Valve Components: Valve body, ball/disc, and seals must all meet food-contact requirements
•Cap and Breather: Lid, cap seal, and any breather plug must be food-contact compliant
•Cage Coating: Any coating that could flake or transfer into the product must be food-safe

Reconditioned Food-Grade IBCs

At Salt Lake IBC, our reconditioned food-grade IBCs go through a rigorous process:

1.History Verification: We only recondition IBCs that previously held food-grade or compatible products. No former chemical containers are reconditioned for food use.
2.Triple Wash: Hot water rinse, caustic wash (NaOH solution), and sanitizing rinse with food-grade sanitizer.
3.Component Replacement: New FDA-compliant gaskets and valve seals are installed on every unit. Caps are replaced.
4.Inspection: Visual inspection for cracks, crazing, staining, or odor retention. Any unit that fails is diverted to industrial-grade.
5.Certification: Each unit receives a certificate of cleaning with batch number and date, traceable to our quality records.

Food Product Category	IBC Requirement	Special Considerations
Drinking Water	New or certified reconditioned, virgin HDPE	Must also meet NSF/ANSI 61 for potable water contact
Fruit Juices & Concentrates	Food-grade, virgin HDPE	Acidic content (pH 2-4) is safe for HDPE; watch for staining
Edible Oils (soy, canola, olive)	Food-grade, virgin HDPE	HDPE absorbs oils slightly; dedicated IBCs recommended
Syrups & Sweeteners	Food-grade, virgin HDPE	High viscosity; ensure 2" valve for adequate flow rate
Wine & Spirits	Food-grade, virgin HDPE	Ethanol is A-rated; flavor absorption possible in reconditioned
Dairy Products (cream, whey)	New food-grade only	Perishable; requires temperature control and rapid turnover
Vinegar	Food-grade, virgin HDPE	Acetic acid at food concentrations is fully compatible
Food-Grade Chemicals (sanitizers)	Food-grade, virgin HDPE	Verify specific chemical compatibility per chart above

UN Certification Codes Explained

Every IBC approved for transporting hazardous materials bears a UN marking stamped or printed on the container. Understanding these codes is essential for regulatory compliance when shipping chemicals via road, rail, or sea.

Reading a UN Marking

A typical UN marking on a composite IBC looks like this:

UN 31HA1/Y/0523/USA/SCHUTZ-1234 / 2640/1500

UN — United Nations designation (indicates compliance with UN transport regulations)

31HA1 — IBC type code (31 = rigid, H = plastic, A = composite with rigid inner, 1 = fitted with structural equipment)

Y — Packing group rating (X = PG I, II, III; Y = PG II, III; Z = PG III only)

0523 — Date of manufacture (month/year: May 2023)

USA — Country of manufacture authorization

SCHUTZ-1234 — Manufacturer name and production code

2640 — Maximum gross weight in pounds

1500 — Stacking test load in kg

UN Type Code	Description	Typical Application
31HA1	Rigid composite IBC, HDPE inner with steel cage	Most common type; general industrial and chemical use
31HH1	Rigid plastic IBC (no cage), blow-molded HDPE	Light-duty food and agricultural liquids
21HA1	Rigid composite IBC for solids	Granular and powder materials
31A	Rigid steel IBC	High-temperature and aggressive chemical applications
31H1	Rigid plastic IBC with structural equipment	Intermediate duty; food-grade liquids
11HA1	Flexible composite IBC (bag-in-cage)	Dry bulk solids; one-trip applications
13HA1	Flexible composite IBC for solids (discharge)	Bottom-discharge bulk bags

Packing Group	UN Letter	Hazard Level	Example Chemicals
PG I	X	Great Danger	Concentrated nitric acid, bromine, fuming sulfuric acid
PG II	Y	Medium Danger	Hydrochloric acid, acetic acid, most industrial chemicals
PG III	Z	Minor Danger	Dilute solutions, food-grade chemicals, soaps

Gasket & Valve Material Compatibility

The gasket and valve seals are often the weakest link in chemical compatibility. An IBC bottle may resist a chemical perfectly while the standard Buna-N gasket fails. Always match the gasket material to your stored product.

Gasket Material	Temp Range	Best For	Avoid	Food-Grade?
Buna-N (Nitrile)	-40 to 250 °F	Petroleum products, oils, fuels	Ketones, strong acids, ozone	No
EPDM	-60 to 300 °F	Water, acids, bases, alcohols, glycols	Petroleum oils, hydrocarbon solvents	Yes (FDA)
Viton (FKM)	-15 to 400 °F	Fuels, oils, acids, chlorinated solvents	Ketones, acetone, amines	No (standard)
Silicone	-80 to 400 °F	Food products, high/low temps, ozone	Hydrocarbon fuels, strong acids	Yes (FDA)
PTFE (Teflon)	-330 to 500 °F	Nearly all chemicals; universal	Molten alkali metals (rare)	Yes (FDA)
Polypropylene (valve body)	32 to 200 °F	Acids, bases, water	Aromatic solvents, chlorinated solvents	Yes (FDA)

Valve Types

•Butterfly Valve (2"): Standard on most IBCs. Good for low-viscosity liquids. Polypropylene body with EPDM or Buna-N seal. Quick quarter-turn operation.
•Ball Valve (2"): Better seal and flow rate than butterfly. Recommended for viscous fluids, chemicals requiring a tight shutoff, and applications with frequent cycling.
•Camlock Valve: Quick-connect design for fast hookup to hoses and pumps. Available in polypropylene, stainless steel, and aluminum.
•Stainless Steel Valve: For aggressive chemicals, high-purity applications, and pharmaceutical use. Significantly more expensive but resists nearly all chemicals.

Connection Standards

•S60x6 (DIN 61): The most common IBC discharge thread worldwide. 60mm outer diameter, 6mm pitch coarse thread. Used on Schutz, Mauser, and most European-origin IBCs.
•2" BSP (British Standard Pipe): Used on some UK and Australian-origin IBCs. Not interchangeable with NPT without an adapter.
•2" NPT (National Pipe Thread): Common on US-manufactured IBCs and industrial plumbing. Tapered thread creates seal under compression.
•NW150 / DN150 (Fill Cap): Standard 150mm top opening thread. Available in screw-cap, flip-top, and vented breather configurations.

What Cannot Be Stored in HDPE IBCs

Aromatic Solvents

Benzene, toluene, xylene, styrene

These solvents cause rapid swelling and permeation through HDPE walls. The container will visibly deform and may leak within hours to days. Use stainless steel IBCs or lined carbon steel tanks instead.

Chlorinated Solvents

Methylene chloride, trichloroethylene, carbon tetrachloride

Chlorinated hydrocarbons aggressively attack HDPE, causing swelling, stress cracking, and brittle failure. These chemicals require stainless steel or glass-lined containers.

Strong Oxidizers (concentrated)

Hydrogen peroxide >50%, fuming nitric acid, chromic acid

Concentrated oxidizers degrade the polymer chains in HDPE, leading to embrittlement and eventual catastrophic cracking. Use fluorinated HDPE or stainless steel.

Concentrated Ketones

Acetone (prolonged), MEK, MIBK, cyclohexanone

Ketones cause softening and dimensional changes in HDPE. While brief contact may be tolerable, long-term storage leads to container failure.

Flammable Gases & LPG

Propane, butane, compressed natural gas

IBCs are not rated for pressure containment. Liquefied gases generate internal pressures that will rupture the container. Use DOT-rated pressure vessels only.

Certain Esters

Ethyl acetate, butyl acetate, methyl acetate

Ester solvents cause swelling and softening of HDPE similar to ketones. Short-term compatibility is marginal; long-term storage is not recommended.

Extended Chemical Compatibility List

Additional chemicals frequently stored in IBCs that are not covered in the primary chart above. Ratings are for ambient temperature (68 degrees F / 20 degrees C).

Chemical	Concentration	HDPE Rating	Notes
Aluminum Sulfate	Saturated	A	Common water treatment chemical; excellent HDPE compatibility
Ammonia (Aqueous)	Up to 30%	A	Common fertilizer and cleaning chemical; safe for HDPE
Boric Acid	Saturated	A	Used in pest control and manufacturing; no effect on HDPE
Butanol (n-Butyl Alcohol)	100%	B	Slight swelling with prolonged exposure; acceptable for short-term
Calcium Hypochlorite	Up to 15%	B	Pool shock chemical; mild oxidation over extended periods
Copper Sulfate	Saturated	A	Agricultural fungicide; excellent HDPE compatibility
DEF / AdBlue (Urea Solution)	32.5%	A	Diesel exhaust fluid; standard concentration fully compatible
DMSO (Dimethyl Sulfoxide)	100%	C	Significant swelling risk; limited use only; verify with manufacturer
Ferrous Sulfate	Saturated	A	Water treatment and fertilizer; no effect on HDPE
Glycolic Acid	Up to 70%	A	Cleaning and cosmetics ingredient; safe for HDPE
Hexane	100%	C	Hydrocarbon solvent; swelling and permeation risk; use stainless steel preferred
Magnesium Chloride	Saturated	A	De-icing and dust suppression; excellent compatibility
Mineral Oil	100%	A	Slight absorption over time but fully compatible; food-grade HDPE recommended
Muriatic Acid (HCl)	31.45%	A	Standard pool/masonry acid; same as hydrochloric acid
Oxalic Acid	Up to 50%	A	Rust remover and bleaching agent; safe for HDPE at all concentrations
Peracetic Acid	Up to 15%	B	Sanitizer for food industry; mild oxidation with extended exposure
Potassium Permanganate	Up to 5%	B	Strong oxidizer at higher concentrations; limit contact time
Propylene Glycol	100%	A	Antifreeze and food-grade coolant; excellent compatibility
Sodium Bisulfite	Up to 40%	A	Water treatment and food preservative; safe for HDPE
Sodium Carbonate (Soda Ash)	Saturated	A	Water treatment and cleaning; excellent compatibility
Sodium Silicate (Water Glass)	Up to 40%	A	Sealant and detergent ingredient; safe for HDPE
Tannic Acid	Up to 10%	A	Leather tanning and water treatment; no effect on HDPE
Turpentine	100%	C	Natural solvent; swelling risk similar to other terpenes; limited use
Zinc Chloride	Saturated	A	Soldering flux and wood preservative; excellent HDPE compatibility

Long-Term Storage & Temperature Compatibility

Chemical compatibility ratings change significantly with temperature and storage duration. A chemical rated "A" at ambient temperature may become "C" or "D" at elevated temperatures. Always factor in your specific storage conditions.

Temperature Effects on HDPE

HDPE chemical resistance decreases as temperature increases. As a general rule, for every 18 degrees F (10 degrees C) increase above ambient, expect the chemical attack rate to approximately double. Key temperature thresholds for HDPE IBCs:

•Below 32 degrees F (0 degrees C): HDPE becomes more brittle. Impact resistance drops. Avoid rough handling in freezing conditions. Water-based contents may freeze and expand, risking bottle rupture.
•32-120 degrees F (0-49 degrees C): Normal operating range. Chemical compatibility ratings as published are valid in this range.
•120-150 degrees F (49-66 degrees C): Many chemicals that are rated "A" at ambient become "B" in this range. Permeation rates increase. Use with caution and monitor for signs of chemical attack.
•Above 150 degrees F (66 degrees C): HDPE begins to soften. Many chemicals become incompatible. Not recommended for standard composite IBCs. Consider stainless steel IBCs for high-temperature applications.

Cross-Contamination Prevention

Preventing cross-contamination between successive IBC contents is critical for product quality and safety. Follow these guidelines:

•Dedicated IBCs: For sensitive products (food, pharmaceutical, cosmetics), maintain dedicated IBCs that only ever contain one product type. Never rotate IBCs between incompatible product categories.
•Absorption awareness: HDPE absorbs certain chemicals (particularly solvents, fragrances, and oils) into the plastic matrix. These absorbed chemicals can leach into subsequent contents even after thorough cleaning. This is the primary reason food-grade IBCs must have verified food-grade prior contents.
•Color transfer: Strongly colored products (dyes, pigmented chemicals) can permanently stain HDPE. A stained IBC may transfer color to subsequent light-colored products even after cleaning.
•Odor retention: Strong-smelling chemicals (solvents, fragrances, certain foods) can leave persistent odors in HDPE that survive cleaning. For odor-sensitive products, use new or rebottled IBCs.
•Gasket replacement: Always replace gaskets and valve seals when switching to a different chemical, even if the gasket appears serviceable. Gasket materials absorb chemicals differently than HDPE and can be a hidden source of contamination.

Not Sure About Your Chemical?

Our team can verify IBC compatibility for your specific product, recommend the right gasket and valve materials, and ensure full regulatory compliance for transport and storage. Contact us for a free compatibility assessment.

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