The Hidden Hazards of Pressurized Aerosols in Cold Storage

Whether you’re managing a warehouse in Winnipeg or overseeing lab supplies in Labrador, one thing’s for sure: pressurized aerosols don’t take kindly to cold. Q&As in this blog entry include:

1. What problems are associated with storing aerosol cans in cold environments?
2. Are all aerosols considered hazardous?
3. What does TDG say about transporting aerosol waste?
4. Can cold temperatures affect TDG compliance?
5. What about aerosol cans used in labs or healthcare settings?
6. Are sanitizer wipes in aerosol form a concern?
7. How should facilities dispose of aerosol waste safely?
8. Are there provincial differences in how aerosol waste is handled?
9. What’s the best way to prevent aerosol mishaps in cold storage?
10. What’s the worst-case scenario regarding pressurized aerosols in cold storage?
11. Where can you get comprehensive advice & help managing large commercial or industrial amounts of unwanted pressurized cans or containers?

1. What problems are associated with storing aerosol cans in cold environments?

Cold storage can compromise the integrity of the can and its contents, turning a convenient spray into a compliance headache. How?

Aerosol cans are pressurized containers, meaning they rely on internal pressure to dispense their contents. When stored in cold environs (think walk-in freezers, unheated sheds, or Canadian winters), the pressure inside the can drops. That might sound like a good thing, but it’s not. Low pressure can cause:

• Incomplete discharge of contents
• Valve malfunction
• Propellant separation
• Container deformation or rupture if reheated too quickly

2. Are all aerosols considered hazardous?

Not all, but many are. Under the Canadian Environmental Protection Act (CEPA), aerosols containing flammable gases (like propane, butane, or dimethyl ether) are classified as CEPA flammable gas waste once discarded.

That means they’re regulated as hazardous waste and must be managed accordingly. But even non-flammable aerosols can pose risks due to toxic ingredients, pressurization hazards, and/or environmental persistence.

So yes, your expired air freshener might be more than just a bad smell. It could be a regulated waste.

3. What does TDG say about transporting aerosol waste?

Transport Canada’s Transportation of Dangerous Goods (TDG) Regulations treat aerosol waste as pressurized container disposal under Class 2.1 (Flammable Gases) or Class 2.2 (Non-Flammable, Non-Toxic Gases), depending on the contents.

Key TDG requirements include:

• Proper classification and documentation
• Approved packaging (UN-rated containers)
• Placarding and labelling
• Trained personnel handling the shipment

And yes, even if the can is empty, it may still be regulated if it retains pressure or residual product. “Empty” doesn’t always mean “safe.”

4. Can cold temperatures affect TDG compliance?

Absolutely. Cold storage can:

• Alter the pressure dynamics of the container
• Cause labels to peel or become illegible
• Lead to misclassification if contents separate or solidify

If a can ruptures or leaks due to cold-induced stress, it could trigger a release event—requiring reporting under CEPA and possibly provincial spill regulations.

(That’s a lot of paperwork for a frozen hairspray.)

5. What about aerosol cans used in labs or healthcare settings?

These are often overlooked but just as risky. Disinfectants, solvents, and anaesthetic sprays may contain flammable or toxic ingredients. [Always check the Safety Data Sheet (SDS) for temperature thresholds and disposal guidance.] In cold storage, they can lose efficacy, become unstable, leak, or rupture. Healthcare and lab facilities should:

• Inventory aerosol products regularly
• Avoid storing them below manufacturer-recommended temperatures
• Treat expired or damaged cans as aerosol waste under CEPA and TDG

6. Are sanitizer wipes in aerosol form a concern?

You bet. During the COVID era, many facilities stocked up on aerosolized disinfectants and wipes. Some contain flammable propellants or volatile organic compounds (VOCs), making them subject to CEPA and TDG rules once discarded. If you have a stockpile in cold storage, it’s time to:

• Inspect for damage or leakage
• Segregate expired products
• Prepare for proper disposal as CEPA flammable gas waste

And no, you can’t just toss them in the regular trash. That’s a one-way ticket to non-compliance.

7. How should facilities dispose of aerosol waste safely?

Disposal must follow both federal and provincial rules. Here’s a quick checklist:

• Identify the product and its classification (flammable, toxic, etc.)
• Determine if it’s regulated under CEPA or TDG
• Use approved containers for collection (UN-rated drums or pails)
• Label and document the waste stream
• Contract a licensed hazardous waste hauler
• Keep records of disposal for at least 2 years (or longer, depending on province)

And remember that puncturing or crushing aerosol cans is a regulated activity. Don’t DIY unless you’re certified and equipped. (We are.)

8. Are there provincial differences in how aerosol waste is handled?

O’Canada! Land of 10 provinces, 3 territories, and a dozen different waste rules. Here’s a taste:

• Ontario treats aerosol waste as hazardous under its Reg. 347, requiring manifesting and licensed carriers.
• Alberta follows TDG and CEPA but has its own tracking system for industrial waste.
• Quebec requires bilingual labelling and strict segregation of flammable waste.
• British Columbia encourages recycling of empty aerosols but regulates full or partially full cans as hazardous.

Bottom line: Always check your local regulations. What flies in Fredericton might freeze in Fort McMurray.

9. What’s the best way to prevent aerosol mishaps in cold storage?

Prevention is the name of the game:

• Inventory regularly (Know what you have and where it’s stored.)
• Label clearly (Use cold-resistant labels and keep SDSs handy.)
• Store smart (Avoid freezing temps unless the product is rated for it.)
• Segregate waste (Keep expired or damaged cans separate from usable stock.)
• Train staff. (Ensure everyone knows the risks and the rules.)

And if you’re ever unsure, consult a hazardous waste expert.

10. What’s the worst-case scenario regarding pressurized aerosols in cold storage?

Picture this: A forgotten box of aerosol cans in a sub-zero shed. Spring arrives, the temperature spikes, and boom—ruptured cans, chemical release, and a visit from your friendly neighbourhood inspector. Now you’re facing:

• CEPA violation notices
• TDG transport infractions
• Provincial fines
• Potential environmental cleanup costs

And all because someone thought “cold storage” meant “out of sight, out of mind.” Don’t be that guy. Or gal.

11. Where can you get comprehensive advice & help managing large commercial or industrial amounts of unwanted pressurized cans or containers?

Pressurized aerosols might be small, but they pack a regulatory punch. From CEPA flammable gas waste to TDG pressurized container disposal, the rules are clear: treat them with respect, especially in cold storage. Whether you’re managing a warehouse, a lab, or a healthcare facility, proactive compliance is your best defence.

Hazardous Waste Disposal Experts specialize in safe, compliant removal of industrial quantities of aerosol containers. Whether you’re dealing with flammable gases, toxic sprays, or expired lab stock, we handle it all—meeting CEPA and TDG requirements with precision.

From pickup to final disposal, we ensure your facility stays safe, legal, and liability-free. Don’t risk a rupture or regulatory fine. Partner with us for peace of mind and expert service.

Contact us today.