Most people know catalytic converters are worth something. Few understand why — or why the price you get quoted can swing by hundreds of dollars depending on who's buying and when. If you're sitting on a pile of cats in London, Ontario, or anywhere else in Canada, understanding how the recycling process actually works puts money back in your pocket.
This is a complete breakdown of how catalytic converter recycling works, what drives price variation, and how to avoid leaving cash on the table when you sell.
What's Actually Inside a Catalytic Converter
The converter looks like a boxy muffler component. What's inside is where the value lives. The honeycomb ceramic or metallic substrate inside is coated with platinum group metals — platinum, palladium, and rhodium. These are referred to in the industry as PGMs. They catalyze the chemical reaction that converts exhaust gases into less harmful emissions.
PGMs are rare. Mining them is expensive and slow. That's why the recycling industry exists — extracting PGMs from spent converters is faster and cheaper than pulling them out of the ground. When you sell a cat, you're essentially selling access to that PGM content. Everything else about pricing flows from that fact.
- Platinum — Used in diesel converters. Prices fluctuate with global industrial demand.
- Palladium — Found heavily in gasoline converters. Has seen significant price swings over recent years.
- Rhodium — The rarest of the three. Even trace amounts significantly affect a converter's value.
The outer shell is typically steel. Some units include aluminum heat shields. These components have scrap value too, but they're secondary to the PGM content inside.
How Catalytic Converter Recycling Actually Works — Step by Step
The recycling chain has several stages, and your payout is affected by where in that chain you sell. Here's how it moves from your yard to the refiner.
- Collection. Converters are pulled from end-of-life vehicles, gathered at auto salvage yards, or collected from repair shops. If you're doing scrap metal recycling in London, this is typically where local buyers or platforms get involved.
- Sorting and identification. Converters are identified by serial number or OEM part code. Each type has a known PGM range. VIN lookup and serial tracking help match a converter to its expected content — SMASH uses exactly this kind of data-driven approach to document inventory accurately.
- Decanning. The ceramic or metallic substrate is removed from the steel shell. This can be done mechanically. The substrate is what gets assayed.
- Sampling and assay. The substrate is ground into powder. A representative sample is sent to a lab (or processed in-house at a large smelter) to measure the actual PGM content by weight.
- Smelting and refining. The PGMs are extracted through high-temperature smelting and chemical refining. The recovered metals re-enter the commodities market.
- Settlement. Sellers are paid based on recovered PGM weight multiplied by the spot price at settlement, minus processing and refining fees.
This process takes time — weeks, sometimes months at the refinery end. That's why early buyers in the chain (local yards, brokers) pay a spread. They're buying your risk and time premium. Knowing this helps you make smarter decisions about where and how you sell.
Why Catalytic Converter Prices Vary So Much
You've probably noticed that prices quoted at different buyers can be wildly different. That's not random. There are real, structural reasons behind the variation — and understanding them is the first step to selling your scrap metal at fair Canadian prices.
PGM spot prices move constantly. Platinum, palladium, and rhodium trade on global commodity markets. A single day's move in rhodium can meaningfully change what a cat is worth. The price you were quoted last week may be different from today's number. This is not a bait-and-switch — it's commodity market reality.
Converter type and model matter enormously. A large-format diesel converter from a commercial truck contains a very different PGM load than a compact cat from a subcompact car. Buyers with access to serial number databases and historical assay data can price accurately. Buyers without that data guess — and they guess conservatively, which means lower offers for you.
Aftermarket versus OEM units. Aftermarket cats — replacements installed at a shop rather than factory originals — typically contain far less PGM content. They look similar but pay out at a fraction of the rate. Experienced buyers identify these quickly. If you're selling a mix, know what you have.
Volume and relationship. A yard sending a full pallet of sorted, documented converters gets treated differently than someone walking in with three random units. Volume buyers get better terms. This is where platforms like SMASH Recycling — where verified buyers bid on your metal change the dynamic. Competition among vetted buyers replaces the single-quote model.
Geography and logistics. Whether you're doing scrap metal recycling in London, selling in Kitchener, or looking for best scrap metal prices in Ontario more broadly, logistics cost affects net price. A buyer who is local or has regional coverage can offer better net pricing than one who charges to ship your material across the country.
How to Get a Fair Price for Your Cats — Practical Steps
You don't need to become a PGM trader to sell smarter. A few concrete steps make a measurable difference.
Document what you have before you call anyone. Serial numbers are stamped on the converter body. Photograph them. If you have the vehicle VIN, even better. This information lets serious buyers price accurately instead of guessing low. Platforms like SMASH support serial tracking and photo documentation precisely because documented inventory commands better offers.
Don't sell to the first buyer who calls back. Get multiple quotes. The difference between a low offer and a fair market offer can be significant on high-value units. One quote is not a market — it's one person's opinion of what you'll accept.
Ask specifically how the price is calculated. Is it a flat rate per unit? A per-pound rate? A percentage of assay return? Each model treats you differently. Flat rates are simple but often low. Assay-based returns are more accurate but take longer. Know what you're agreeing to.
Use online platforms that connect you to multiple buyers. If you want to sell catalytic converters online, the advantage is access — you're not limited to whoever picks up the phone in your area. Buyers across Canada and the U.S. can compete for your material. That competition is how fair pricing gets discovered. You can also explore scrap metal selling guides to better understand the process before you commit.
Separate your material. Don't mix high-value OEM converters with aftermarket replacements in the same lot unless you're disclosing and pricing accordingly. Mixed lots get priced to the low end.
London and Ontario Sellers: What You Should Know Locally
London, Ontario has active auto salvage and recycling infrastructure. Southwestern Ontario generates significant volumes of end-of-life vehicles, which means there are buyers in the market — but buyer activity doesn't automatically mean competitive pricing. Local doesn't always mean best price. Local London scrap metal services can be a good starting point, but pairing that with access to online buyers through SMASH gives you leverage that a single local call never will.
If you're moving volume — a yard doing regular pickups, a mechanic pulling converters routinely, or a demolition operator collecting cats from fleet vehicles — you should be approaching this as a business transaction, not a one-off sale. Documented inventory, competitive bidding, and transparent pricing aren't extras. They're the baseline you deserve. Get a fair price for your scrap today by making sure more than one buyer knows what you have.
Ontario's scrap market connects to national commodity flows. Prices in London track the same PGM market as Kitchener, Toronto, Calgary, or Vancouver. The difference in what sellers receive comes down to process — how well documented the material is, how many buyers are competing, and whether the seller is treating it like a transaction or a favor.
The Bottom Line on Catalytic Converter Pricing
Catalytic converter prices vary because PGM markets move, because converter types differ dramatically, and because the buyer you sell to determines how much of that value reaches you. The gap between a low offer and a fair market offer isn't luck — it's information and competition.
SMASH connects sellers with vetted buyers who bid competitively on documented loads. No subscription fees. No guesswork. When you put real inventory data in front of multiple serious buyers, price discovery happens. That's the whole model.
If you're in London or anywhere across Ontario and you've got cats to move — or copper, aluminum, steel, or other non-ferrous material — you don't have to accept the first number you hear. Document your material, get it in front of qualified buyers, and let competition do its job. The scrap metal market is more accessible than it used to be. Use that.
Ready to put your material in front of buyers who compete for it? Sell your scrap metal at fair Canadian prices — request a pickup at sell-scrapmetal.ca.
Frequently Asked Questions
Q: How do I know if my catalytic converter is OEM or aftermarket?
OEM converters are installed at the factory and typically have the vehicle manufacturer's markings or specific part codes on the body. Aftermarket units — installed as replacements — often have generic markings and are noticeably lighter. If you have the vehicle VIN, a buyer with serial tracking capability can confirm the original spec quickly. Aftermarket cats pay significantly less, so knowing what you have before you sell matters.
Q: Why are catalytic converter prices different in London compared to other Ontario cities like Kitchener or Hamilton?
PGM prices are global — the commodity market doesn't change by city. What changes is local buyer competition and logistics. A buyer closer to your material has lower transportation costs, which can translate to better net pricing. Using an online platform like SMASH means geography matters less, because buyers across the region compete regardless of where you're located.
Q: How long does it take to get paid for catalytic converters?
This depends entirely on the sale structure. Local buyers paying a flat rate per unit can settle the same day. Assay-based programs — where you're paid based on actual recovered PGM content — take longer, often several weeks for the full settlement. Understand the timeline before you agree to the terms.
Q: Can I sell catalytic converters online from London, Ontario?
Yes. Platforms designed for scrap metal recycling connect London sellers with vetted buyers across Canada and North America. You document your inventory with photos and serial numbers, buyers review and bid, and logistics are coordinated from there. It removes the single-buyer limitation that local-only selling creates.
Q: Do I need to remove the catalytic converter myself before selling?
Not necessarily. If you're selling a complete end-of-life vehicle, the buyer or pickup service typically handles removal. If you're selling individual units — for example, from a repair shop — they're already removed. Confirm with your buyer what condition they want the material in before arranging pickup or drop-off.
Disclaimer: Scrap metal and catalytic converter prices fluctuate with global commodity markets. The information in this article reflects general industry practice as of August 2026. Always check current rates with your buyer before making selling decisions.
Stay current on scrap metal market trends and industry news — follow SMASH on LinkedIn for updates, pricing insights, and practical advice for Canadian recyclers and sellers.