HDPE Chemical Compatibility Guide: Complete Storage Chart
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What Chemicals Are Compatible with HDPE?
HDPE (High-Density Polyethylene) is compatible with: most acids up to 50% concentration, alcohols (methanol, ethanol, isopropanol), bases (sodium hydroxide, potassium hydroxide), hydrogen peroxide up to 30%, salts, and water-based solutions.
HDPE is NOT compatible with: aromatic solvents (benzene, toluene, xylene), ketones (acetone, MEK), chlorinated hydrocarbons, and strong oxidizing acids like concentrated nitric acid.
This makes HDPE ideal for hazmat shipping containers and food-grade storage.
Quick Compatibility Check
| Chemical Type | HDPE Compatibility | Safe for Storage? |
|---------------|-------------------|-------------------|
| Methanol, ethanol, isopropanol | Excellent | ✅ Yes |
| Acetone, MEK, ketones | Not compatible | ❌ No |
| Acids up to 50% | Generally compatible | ✅ Yes |
| Aromatic solvents (toluene, xylene) | Not compatible | ❌ No |
| Sodium hydroxide (up to 50%) | Excellent | ✅ Yes |
| Hydrogen peroxide (up to 30%) | Excellent | ✅ Yes |
Need the full chart? Keep scrolling for 50+ chemicals with detailed compatibility ratings.
High-density polyethylene (HDPE) containers are the industrial standard for chemical storage, but understanding chemical compatibility is critical for safety, regulatory compliance, and preventing costly incidents. This guide provides comprehensive information for safe HDPE chemical storage practices.
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HDPE Chemical Compatibility Chart
Excellent Compatibility (A-Rated)
These chemicals can be safely stored long-term in HDPE containers:
Acids (Weak to Moderate):
- Acetic acid (up to 80%)
- Citric acid (all concentrations)
- Lactic acid (all concentrations)
- Phosphoric acid (up to 85%)
- Boric acid (saturated solution)
Bases:
- Sodium hydroxide (up to 50%)
- Potassium hydroxide (up to 50%)
- Ammonium hydroxide (up to 30%)
- Calcium hydroxide (saturated)
Salts and Aqueous Solutions:
- Sodium chloride (brine)
- Calcium chloride (all concentrations)
- Potassium chloride
- Magnesium sulfate
- Sodium sulfate
Alcohols:
- Methanol (up to 100%)
- Ethanol (up to 95%)
- Isopropanol (up to 100%)
- Glycerin (all concentrations)
Others:
- Hydrogen peroxide (up to 30%)
- Vegetable oils
- Animal fats
- Liquid soaps and detergents
Good Compatibility (B-Rated)
Safe for short-term storage but monitor regularly:
- Hydrochloric acid (>20%)
- Sulfuric acid (>50%)
- Nitric acid (>40%)
- Formaldehyde (>37%)
Not Recommended (C/D-Rated)
Avoid storing these in HDPE:
❌ Aromatic Solvents:
- Benzene
- Toluene
- Xylene
❌ Ketones:
- Acetone
- MEK (methyl ethyl ketone)
- MIBK (methyl isobutyl ketone)
❌ Strong Oxidizers:
- Concentrated nitric acid (>70%)
- Concentrated sulfuric acid (>90%)
- Chromic acid
❌ Chlorinated Solvents:
- Carbon tetrachloride
- Chloroform
- Methylene chloride
HDPE Solvent Compatibility: Complete Guide
Many industrial applications require storing solvents in HDPE containers. Here's the complete breakdown of HDPE solvent compatibility:
Solvents COMPATIBLE with HDPE (Safe for Storage)
| Solvent | Concentration | Compatibility Rating | Notes |
|---------|--------------|---------------------|-------|
| Methanol | Up to 100% | Excellent (A) | Safe for long-term storage |
| Ethanol | Up to 95% | Excellent (A) | Denatured or pure |
| Isopropanol (IPA) | Up to 100% | Excellent (A) | Common cleaning solvent |
| Glycerin/Glycerol | All concentrations | Excellent (A) | Used in food/pharma |
| Ethylene glycol | All concentrations | Good (B) | Antifreeze applications |
| Mineral spirits | All concentrations | Good (B) | Monitor for slight swelling |
Solvents NOT COMPATIBLE with HDPE (Avoid)
| Solvent | Issue | Alternative Container |
|---------|-------|---------------------|
| Acetone | Causes stress cracking | Glass, stainless steel |
| MEK (Methyl Ethyl Ketone) | Degrades HDPE rapidly | Metal containers |
| MIBK | Swelling and softening | Metal containers |
| Toluene | Permeation and swelling | Metal, fluorinated HDPE |
| Xylene | Permeation and swelling | Metal, fluorinated HDPE |
| Benzene | Permeation | Metal, fluorinated HDPE |
| Chloroform | Permeation | Glass |
| Methylene chloride | Attacks HDPE | Glass, stainless steel |
Key Factors Affecting Solvent Compatibility
- Temperature - Higher temps increase permeation risk
- Concentration - Pure solvents more aggressive than diluted
- Exposure time - Long-term storage more critical than short-term
- Container stress - Filled containers under load are more vulnerable
Need UN-certified pails for solvent storage? Our M2 5-Gallon HDPE Pails are compatible with alcohols, glycols, and many industrial solvents. For aggressive solvents, ask about our fluorinated options. Get a quote →
For hazmat transport requirements, see our dangerous goods pails guide.
Ready to Order? Get a free freight quote for UN-certified HDPE pails delivered to your facility. Request Bulk Pricing →
Safety Best Practices
Temperature Considerations
Safe Operating Range: 40°F to 140°F
Maximum Short-Term: 180°F (hot-fill operations)
Minimum: -40°F (cold storage)
Temperature Effects:
- Above 140°F: Increased permeation risk
- Above 180°F: Potential warping/deformation
- Below 40°F: Increased brittleness
Ventilation Requirements
Volatile Chemicals:
- Store in well-ventilated areas
- Minimum 6 air changes per hour
- Explosion-proof ventilation for flammable materials
Odorous Chemicals:
- HDPE has low permeability but isn't completely odor-proof
- Dedicated storage areas recommended
- Consider vapor barriers for strong-smelling substances
Secondary Containment
Regulatory Requirements (EPA 40 CFR 264.175):
- Contain 110% of largest container volume
- Impervious floor/liner
- No cracks or gaps in containment
- Drain systems with shut-off valves
Implementation:
- Spill pallets rated for chemical compatibility
- Berm systems for bulk storage
- Drip pans under individual containers
- Regular inspection and maintenance
Chemical-Specific Guidelines
Acids
Storage Recommendations:
- Separate from bases and oxidizers
- Ground containers if handling flammables
- Use acid-resistant secondary containment
- Regular visual inspections for corrosion signs
Compatibility Notes:
- Weak acids (<20%): Excellent long-term storage
- Moderate acids (20-70%): Good compatibility
- Concentrated acids (>70%): Check manufacturer data
Caustics (Bases)
Storage Recommendations:
- Separate from acids
- Well-sealed lids to prevent CO₂ absorption
- Temperature-controlled environments
- Avoid prolonged UV exposure
Reactions with HDPE:
- No chemical reaction under normal conditions
- Can cause stress cracking at elevated temperatures
- Monitor for cloudiness or discoloration
Solvents and Alcohols
HDPE solvent compatibility varies significantly by solvent type. Understanding which solvents work with HDPE is critical for safe storage.
HDPE-Compatible Alcohols (Excellent Long-Term Storage):
| Alcohol | Max Concentration | Notes |
|---------|-------------------|-------|
| Methanol | 100% | Excellent HDPE methanol compatibility - safe for long-term storage |
| Ethanol | 95% | Excellent compatibility, widely used in HDPE |
| Isopropanol (IPA) | 100% | Standard industrial storage in HDPE |
| n-Butanol | 100% | Good compatibility |
| Glycerin | 100% | Excellent, very stable |
HDPE-Compatible Glycols:
- Ethylene glycol (antifreeze) - Excellent
- Propylene glycol - Excellent
- Polyethylene glycol (PEG) - Excellent
- Diethylene glycol - Good
Incompatible Solvents (Do NOT Store in HDPE):
| Solvent Type | Examples | Why Incompatible |
|--------------|----------|------------------|
| Aromatic solvents | Benzene, toluene, xylene | Cause swelling and permeation |
| Ketones | Acetone, MEK, MIBK | Soften and degrade HDPE |
| Esters | Ethyl acetate, butyl acetate | Cause stress cracking |
| Chlorinated solvents | Chloroform, methylene chloride | Attack polymer structure |
| Halogenated hydrocarbons | Carbon tetrachloride | Rapid degradation |
Warning Signs of Solvent Incompatibility:
- Swelling or bulging of container walls
- Softening of plastic (feels rubbery)
- Discoloration or cloudiness
- Stress cracking or crazing
- Chemical odor through container walls
Oxidizers
Safe Oxidizers in HDPE:
- Hydrogen peroxide (up to 30%)
- Sodium hypochlorite (bleach, up to 15%)
- Calcium hypochlorite (pool shock)
Unsafe Oxidizers:
- Concentrated hydrogen peroxide (>35%)
- Nitric acid (>70%)
- Chromic acid
- Perchloric acid
Inspection and Monitoring
Regular Inspection Schedule
Daily (for hazmat):
- Visual check for leaks
- Lid integrity verification
- Secondary containment inspection
Weekly:
- Detailed container examination
- Label legibility check
- Inventory verification
Monthly:
- Structural integrity testing
- Chemical compatibility review
- Documentation audit
Warning Signs
Immediate Action Required:
- Visible cracks or splits
- Bulging or deformation
- Active leaking
- Discoloration or opacity changes
- Stress whitening around stress points
Monitor Closely:
- Minor scratches or scuffs
- Slight cloudiness
- Fading labels
- Dust buildup
Labeling and Documentation
Required Information
Primary Label:
- Chemical name (no abbreviations)
- Concentration
- Hazard warnings (GHS pictograms)
- Date of receipt/fill
- Lot/batch number
Secondary Information:
- Supplier contact
- Emergency contact numbers
- Storage requirements
- Expiration date (if applicable)
SDS (Safety Data Sheets) Management
Requirements:
- Readily accessible (within 30 seconds)
- Current versions only
- Organized by location/chemical
- Electronic and/or hard copy
Disposal and Recycling
Empty Container Disposal
Triple-Rinse Protocol:
- Rinse with appropriate solvent/water
- Dispose rinse water per regulations
- Repeat 3 times minimum
- Remove all labels
- Puncture or crush to prevent reuse
Recycling:
- HDPE recycling code: #2
- Must be completely empty
- Hazmat residue = hazardous waste
- Follow local regulations
Waste Chemical Disposal
Never mix chemicals for disposal:
- Acids with bases (heat/gas generation)
- Oxidizers with organics (fire risk)
- Incompatible materials
Contact licensed waste hauler for:
- Hazardous waste removal
- Manifesting and tracking
- Regulatory compliance
Regulatory Compliance
OSHA Requirements (29 CFR 1910.1200)
Hazard Communication:
- Chemical inventory maintained
- SDS accessible
- Proper container labeling
- Employee training documented
Violations and Penalties:
- Serious: $13,653 per violation
- Repeat: $136,532 per violation
- Willful: Up to $136,532
EPA Storage Requirements (RCRA)
For facilities storing >1,000 kg/month:
- Container condition standards
- Compatibility requirements
- Inspection protocols
- Personnel training
- Emergency preparedness
Emergency Response
Spill Procedures
Small Spills (<1 gallon):
- Evacuate immediate area
- Don appropriate PPE
- Contain with absorbent materials
- Clean with appropriate methods
- Dispose as hazardous waste
Large Spills (>1 gallon):
- Evacuate and secure area
- Call emergency responders
- Activate emergency response plan
- Do NOT attempt cleanup without training
- Notify regulatory agencies if required
Container Failure
Immediate Actions:
- Isolate area
- Stop source if safe
- Activate secondary containment
- Begin transfer to new container
- Document incident
- Investigate root cause
HDPE Nitric Acid Compatibility: Detailed Guide
Understanding HDPE compatibility with nitric acid is critical because nitric acid concentration determines whether HDPE storage is safe or dangerous.
HDPE Nitric Acid Compatibility by Concentration
| Nitric Acid Concentration | HDPE Compatibility | Storage Rating | Maximum Duration |
|--------------------------|-------------------|----------------|-----------------|
| Up to 20% | Excellent (A) | Safe for long-term storage | Years |
| 20-40% | Good (B) | Safe with regular monitoring | 12+ months |
| 40-50% | Fair (B-) | Short-term storage only | 6 months max |
| 50-70% | Limited (C) | Not recommended without testing | Weeks only |
| 70%+ (concentrated) | Not compatible (D) | Do not store in HDPE | None |
Why Is Concentrated Nitric Acid (70%+) Incompatible with HDPE?
Concentrated nitric acid above 70% is a strong oxidizer that attacks the polyethylene chain structure. At this concentration, nitric acid:
- Oxidizes the HDPE polymer chains, causing surface degradation
- Generates heat through exothermic reaction with the plastic
- Causes stress cracking that can lead to catastrophic container failure
- Produces toxic nitrogen dioxide (NO₂) gas when reacting with organic materials
For concentrated nitric acid storage (>70%): Use glass, fluorinated HDPE (F-HDPE), PTFE-lined containers, or stainless steel (316L grade).
Safe HDPE Use with Dilute Nitric Acid
For nitric acid concentrations below 50%, HDPE containers provide excellent, cost-effective storage:
- Store at ambient temperature (below 100°F)
- Inspect container walls monthly for discoloration or softening
- Use UN-certified HDPE pails for DOT-compliant transport
- Ensure proper ventilation in storage areas
- Maintain secondary containment per EPA 40 CFR 264.175
Need UN-certified pails for dilute nitric acid? PailHQ M2 5-gallon HDPE pails are UN 1H2/Y27/S certified for hazmat transport. Get bulk pricing →
HDPE Chromic Acid Compatibility
Chromic acid is NOT compatible with HDPE containers. Chromic acid (chromium trioxide, CrO₃) is a powerful oxidizer that degrades HDPE rapidly, regardless of concentration.
Why Chromic Acid Attacks HDPE
- Chromic acid is one of the strongest oxidizing agents used in industry
- It attacks carbon-hydrogen bonds in the polyethylene chain
- Causes rapid surface crazing, discoloration, and embrittlement
- Even dilute solutions (10%) can damage HDPE within days
Alternatives for Chromic Acid Storage
| Container Material | Suitability | Notes |
|-------------------|-------------|-------|
| Glass | Excellent | Best for lab quantities |
| PTFE/Teflon | Excellent | Expensive but highly resistant |
| Fluorinated HDPE | Good | Cost-effective alternative |
| Stainless Steel (316L) | Limited | Check grade compatibility |
| PVC | Not recommended | Attacked by strong oxidizers |
For chromic acid waste disposal and handling, see our chemical storage requirements guide.
HDPE Sulfuric Acid Compatibility
HDPE has good compatibility with sulfuric acid at concentrations up to 50%. Above 70% concentration, compatibility decreases significantly.
HDPE Sulfuric Acid Compatibility by Concentration
| Sulfuric Acid Concentration | HDPE Compatibility | Notes |
|----------------------------|-------------------|-------|
| Up to 50% | Excellent (A) | Safe for long-term storage |
| 50-70% | Good (B) | Monitor regularly, temperature sensitive |
| 70-93% | Limited (C) | Not recommended for HDPE |
| 93%+ (concentrated) | Not compatible (D) | Use glass or PTFE |
Battery acid (35% H₂SO₄) is fully compatible with HDPE and is commonly stored in HDPE containers throughout the automotive and industrial sectors.
HDPE Sodium Hypochlorite Compatibility
HDPE has good chemical resistance to sodium hypochlorite (bleach) at typical concentrations used in water treatment, sanitation, and cleaning applications.
Compatibility by Concentration
| Sodium Hypochlorite | HDPE Rating | Common Use |
|--------------------|-------------|------------|
| Up to 5% (household bleach) | Excellent (A) | Cleaning, sanitation |
| 5-12% (commercial bleach) | Good (B) | Water treatment, pools |
| 12-15% (industrial) | Fair (B-) | Industrial disinfection |
| Above 15% | Limited (C) | Use with caution |
Key consideration: Sodium hypochlorite degrades over time, producing oxygen gas that can pressurize sealed containers. Ensure adequate venting for long-term storage in sealed HDPE pails.
HDPE Acetic Acid Compatibility
HDPE provides excellent compatibility with acetic acid at all common concentrations, making it the preferred container material for vinegar, cleaning solutions, and industrial acetic acid applications.
- Glacial acetic acid (99.7%): Good compatibility (B) - safe for storage
- Dilute acetic acid (up to 80%): Excellent compatibility (A) - safe for long-term storage
- Vinegar (4-8%): Excellent compatibility (A) - standard storage material
Our FDA food-grade HDPE pails are ideal for food-contact acetic acid applications like vinegar storage and food processing.
HDPE Acetone Compatibility
Acetone is NOT compatible with HDPE containers. Despite being a common industrial solvent, acetone causes environmental stress cracking (ESC) in HDPE, leading to container failure.
Why Acetone Damages HDPE
- Acetone absorbs into HDPE's amorphous regions, causing swelling
- Creates environmental stress cracking at points of mechanical stress
- Container can appear intact but fail suddenly under load
- Even brief contact can initiate micro-cracks
Safe Storage Alternatives for Acetone
- Glass containers - best for lab quantities
- Metal containers (steel or aluminum) - for industrial quantities
- Fluorinated HDPE - if plastic is required
- PTFE-lined containers - for high-purity applications
HDPE Gasoline Compatibility
HDPE has limited compatibility with gasoline. While many consumer fuel containers are made from HDPE, long-term storage requires special formulations.
- Short-term storage (days-weeks): HDPE is adequate for temporary fuel containment
- Long-term storage (months+): Standard HDPE will experience permeation (fuel smell through walls)
- Fuel-rated HDPE containers use cross-linked or fluorinated HDPE to prevent permeation
- UN-rated fuel containers must meet additional DOT requirements for hazmat transport
For fuel storage applications, consult our dangerous goods pails guide for DOT-compliant options.
HDPE Pesticide Container Compatibility
HDPE is the standard container material for pesticide storage and transport, including organophosphate pesticides. Most pesticide formulations are compatible with HDPE:
- Liquid pesticides: Compatible with HDPE at typical formulation concentrations
- Organophosphate pesticides: HDPE provides excellent chemical resistance
- Herbicides (glyphosate, 2,4-D): Fully compatible with HDPE
- Fungicides: Generally compatible with HDPE
For agricultural applications, our UN-certified HDPE pails meet EPA and DOT requirements for pesticide storage and transport. See our agriculture applications page for more information.
Frequently Asked Questions
What chemicals can be stored in HDPE containers?
HDPE containers can safely store a wide range of chemicals including weak to moderate acids (acetic, citric, phosphoric), bases (sodium hydroxide up to 50%, potassium hydroxide), alcohols (methanol, ethanol, isopropanol), and most aqueous salt solutions. HDPE offers excellent resistance to most common industrial chemicals, making it ideal for chemical storage applications.
What chemicals should NOT be stored in HDPE?
Avoid storing aromatic solvents (benzene, toluene, xylene), ketones (acetone, MEK), chlorinated solvents (carbon tetrachloride, chloroform), and strong oxidizers (concentrated nitric acid >70%, chromic acid) in HDPE containers. These chemicals can cause swelling, softening, or degradation of the plastic.
Is HDPE compatible with nitric acid at 70% concentration?
HDPE has limited compatibility with 70% nitric acid. At this concentration, nitric acid is a strong oxidizer that can degrade HDPE over time. For concentrations below 50%, HDPE provides good storage. For 70%+ concentration, use fluorinated HDPE (F-HDPE), glass, or PTFE-lined containers instead. See our detailed nitric acid compatibility section above for concentration-specific ratings.
Is HDPE compatible with acids?
Yes, HDPE has excellent compatibility with most acids at typical concentrations. Weak acids like acetic and citric acid can be stored long-term. Moderate acids like hydrochloric acid (up to 20%) and sulfuric acid (up to 50%) are also compatible. However, avoid concentrated acids above 70% concentration without manufacturer verification.
Is HDPE compatible with chromic acid?
No, chromic acid is NOT compatible with HDPE at any concentration. Chromic acid is one of the strongest oxidizing agents and rapidly degrades HDPE, causing surface crazing, discoloration, and embrittlement. Use glass, PTFE, or fluorinated HDPE containers for chromic acid storage. See our chromic acid compatibility section for alternatives.
Is HDPE compatible with sulfuric acid?
HDPE has excellent compatibility with sulfuric acid up to 50% concentration, making it suitable for battery acid (35%) and many industrial applications. At 50-70%, compatibility decreases and regular monitoring is needed. Above 93% (concentrated), HDPE is not recommended. See our sulfuric acid compatibility table for detailed ratings.
How do I know if HDPE is compatible with my chemical?
Check the chemical compatibility chart above, consult the chemical's Safety Data Sheet (SDS), or contact the container manufacturer. Warning signs of incompatibility include container swelling, softening, discoloration, or stress cracking. When in doubt, conduct a small-scale compatibility test before full-scale storage.
What temperature range is safe for HDPE chemical storage?
HDPE containers operate safely between 40°F and 140°F (-40°C to 60°C). Hot-fill operations can reach 180°F short-term. Below 40°F, HDPE becomes more brittle. Above 140°F, chemical permeation risk increases. For temperature-sensitive chemicals, consult our compliance guidelines.
Does HDPE meet UN hazmat requirements?
Yes, properly certified HDPE containers meet UN packaging requirements for hazardous materials. Our UN-certified 5-gallon pails carry the UN 1H2/Y27/S designation, approved for Packing Groups II and III hazardous materials transport per DOT regulations. Learn more in our UN certification guide.
How long can chemicals be stored in HDPE containers?
With proper storage conditions and compatible chemicals, HDPE containers can safely store chemicals for years. However, follow manufacturer recommendations, inspect containers regularly, and rotate stock based on chemical stability. Some chemicals may have shelf-life limitations regardless of container material.
Is HDPE food-safe for chemical storage?
HDPE used for food contact meets FDA 21 CFR 177.1520 requirements. However, once an HDPE container has stored chemicals, it should never be repurposed for food use. Food-grade containers should be dedicated solely to food applications.
What is HDPE chemical resistance?
HDPE chemical resistance refers to the material's ability to withstand chemical exposure without degradation. HDPE (High-Density Polyethylene) has excellent chemical resistance to most acids, bases, alcohols, and salt solutions. It resists corrosion that would damage metals, making it the preferred material for industrial chemical containers. Check our complete compatibility chart for specific chemicals.
Is polyethylene chemical compatible with solvents?
Polyethylene (HDPE) has varied solvent compatibility. It is compatible with alcohols (methanol, ethanol, isopropanol), glycols, and mineral spirits. However, HDPE is NOT compatible with aromatic solvents (benzene, toluene), ketones (acetone, MEK), or chlorinated solvents (chloroform, methylene chloride). See our complete solvent compatibility table for details.
Related Glossary Terms
- HDPE (High-Density Polyethylene) — What makes HDPE the standard for chemical storage
- Chemical Resistance — How polymers interact with chemical compounds
- Packing Groups (I, II, III) — UN hazard classification by degree of danger
Related Resources
- Dangerous Goods Pails: Hazmat Container Guide - DOT requirements for hazmat shipping
- UN Certified Pails: Complete Guide - Understanding hazmat container requirements
- HDPE vs PP vs PET Container Comparison - Choosing the right material
- Chemical Storage Container Requirements Guide - Industry-specific guidelines
- Food-Safe vs Industrial Grade Containers - Material differences explained
PailHQ Container Specifications
Our M2 5 Gallon HDPE Pail is designed for safe chemical storage:
Material Specifications:
- Virgin HDPE resin
- 0.070" minimum wall thickness
- Broad chemical compatibility
- FDA food-grade approved
Safety Features:
- 1,200 lb top-load rating
- UN 1H2/Y27/S hazmat certified
- Gamma seal lid compatible
- Comprehensive compatibility data provided
Documentation Included:
- Material Safety Data Sheet
- Chemical compatibility chart
- FDA compliance letter
- UN certification documents
View Full Chemical Compatibility Data →
Related Resources
- 5 Gallon Pail Pallet Quantity Guide — 120 pails per pallet, truckload calculations, freight savings
- UN Certification Explained — What UN 1H2/Y27/S means for hazmat shipping
- Dangerous Goods Pails: Hazmat Shipping Guide — DOT requirements for chemical transport
- Food Grade vs Regular Buckets — FDA food-grade HDPE explained
- Compare Plastic Pails: HDPE vs PP — Chemical resistance comparison
Questions about storing a specific chemical? Contact our technical team at 954-594-2108 for compatibility verification and storage recommendations.