No, most food cans use steel with protective linings; aluminum is common for drinks, not typical for canned foods.
Walk any grocery aisle and you’ll see two metals at work. Drinks usually come in aluminum. Shelf-stable soups, tomatoes, tuna, and pet meals tend to ship in coated steel. This guide brings quick tests, sourcing notes, and safety tips.
Are Grocery Cans Aluminum Or Steel: What You’re Buying
Food packaging uses several metals, but the big two are coated steel for pantry goods and aluminum for beverages. Trade groups explain that food cans use tinplate or tin-free steel with polymer linings to keep food from touching bare metal.
Quick Ways To Tell Steel From Aluminum
- Magnet test: a fridge magnet sticks to steel cans; it won’t stick to aluminum. Many recycling programs even define “tin/steel cans” as magnet-friendly containers used for foods.
- Weight and feel: steel cans feel sturdier and often have side seams; beverage cans feel lighter and springy.
- Recycling marks: look for “FE” for steel or “ALU” for aluminum on some packages.
What’s Inside The Can Wall
Modern steel food cans are coated inside to stop corrosion and preserve flavor. Beverage cans are also lined. The U.S. Food and Drug Administration notes that epoxy resins made with bisphenol A (BPA) have long been used and that any substance that may migrate into food is reviewed as a food-contact material. See the FDA’s overview of BPA use in can linings.
Common Products And Typical Can Metals
This table shows common items and the metal you’ll usually find. Brands and regions can differ.
| Product Type | Typical Can Metal | Notes / Quick Check |
|---|---|---|
| Sodas, seltzers, energy drinks | Aluminum | Lightweight two-piece body; smooth walls; “ALU” mark on some packs. |
| Soups, beans, tomatoes | Steel (tinplate or coated) | Magnet sticks; often a visible vertical seam inside the label area. |
| Tuna, salmon, pet food | Mostly steel; some lines use aluminum | Varies by plant and size; magnet test is handy. |
| Broths, gravies | Steel with lining | Used for shelf-stable sterilized goods. |
| Tomato paste & acidic fruit | Steel with durable lining | Lining protects against acid; don’t store leftovers in the opened can. |
Why Pantry Goods Skew Toward Steel
Steel offers rigidity for larger diameters, handles retort sterilization well, and is easy to seam with ends in many sizes. Trade groups describe two main formats: tin-plated steel and tin-free steel, both usually finished with a food-grade internal coating. For a plain guide to how cans are made, see the MPMA’s page on raw materials and formats.
Fillers rely on mature steel formats across soups, vegetables, meats, and pet meals. Beverage lines lean aluminum.
Where Aluminum Shows Up In Food Packaging
Aluminum is king for drink cans, and the Aluminum Association documents the path from hot-rolled body stock to formed bodies and lids. It’s light, chills fast, and recycles well.
Some specialty foods do use aluminum bodies or ends. The material choice depends on product acidity, size, retort cycle, and local can-making capacity. Technical reviews list aluminum alongside tinplate and tin-free steel among the common metals for can bodies and ends.
Lining Chemistry, Safety, And Simple Kitchen Habits
That thin inner film keeps flavors stable and stops corrosion. The FDA explains that epoxy systems with BPA have been used for decades and that uses of any food-contact substance are controlled through premarket approvals.
Practical Tips For Home Use
- After opening, transfer leftovers: once the sterile seal is broken, move food to a clean container and refrigerate. Acidic foods can corrode exposed seams over time.
- Don’t boil cans on the stove: factory retort cycles are precise; home heating of a sealed can can cause leaks or rupture.
- Watch dented seams: sharp rim or seam dents can compromise sealing. When in doubt, skip it.
How To Check The Metal On The Package
Labels sometimes include a recycling mark. “FE” denotes steel and “ALU” denotes aluminum. These marks appear more often on multipacks and trays than on the can’s paper label, so the magnet test is still the quick choice. If no mark appears, packaging weight and feel can also hint at the metal.
Material Pros And Cons For Shoppers
Here’s a condensed view of trade-offs that matter on the shelf and at home.
| Factor | Steel Food Cans | Aluminum Drink Cans |
|---|---|---|
| Rigidity & size range | Great for wide diameters and tall formats used in soups, veggies, meats. | Best for slim drink formats; bodies are thin for weight savings. |
| Recycling pathway | Magnet-sorted; widely accepted in curbside streams. | High value scrap; strong closed-loop capture. |
| Lining need | Yes, to protect food and seams during retort cycles. | Yes, to prevent flavor pickup and corrosion. |
| At-home clue | Magnet sticks; labels often hide a vertical side seam. | Magnet doesn’t stick; ends may feel stiffer than the body. |
Two-Piece Versus Three-Piece Construction
Two-piece bodies draw from a single disk and get a top end later; that’s the norm for drinks. Three-piece bodies wrap a sheet into a cylinder with a welded seam; that format suits many pantry sizes and handles retort cycles well.
Ends And Openers
Ends are seamed on as a separate part. Pull-tab ends can be aluminum even on a steel body. The double seam locks multiple layers with a sealing compound, so avoid cans with crushed seams.
Recycling Tips That Actually Help
Rinse, drop the loose lid inside, and recycle unbagged. Steel sorts by magnet; aluminum holds high scrap value. Use “FE” and “ALU” marks when shown. Local programs differ on lids and labels, so check your city’s guidance when in doubt.
What This Means For Shoppers
Expect most pantry staples in steel and most drinks in aluminum. Fish and pet food can go either way; use a magnet. The lining protects quality; metal choice mainly changes handling and recycling route.
Care And Storage Details
Wipe the top before opening. If contents spurt or smell off, discard. After opening, move leftovers to a clean container and refrigerate.
Answers To Common Misconceptions
“All Cans Are Tin.”
Tinplate is a very thin coating on steel, used historically to keep wet foods from rusting the steel. Modern cans often use polymer coatings over steel, with little or no exposed tin.
“Every Food Brand Uses The Same Metal.”
Not always. A small tuna can made in one plant may be aluminum; a taller can from another plant may be steel. The magnet test is your friend.
“Linings Mean Chemicals In My Meal.”
Linings exist to keep food stable through cooking, shipping, and storage. The FDA regulates the substances used for that job and reassesses when new data arrives. You can read the agency’s plain-language overview of BPA use in can linings.
Buying Better: Small Checks With Big Payoff
Check seams and ends. Compare unit price by net weight. Pop-tops help for camping. Straight-sided cans stack easier.
How These Facts Were Compiled
Details came from recognized bodies: MPMA on materials and formats, the Aluminum Association on can body stock and lids, CMI shipment data, and FDA pages on food-contact coatings.
For quick consumer checks, recycling marks and magnet behavior help you tell metals apart at home.