Bare cast iron vs PTFE nonstick
Quick answer
PTFE nonstick spreads heat faster: its aluminium body conducts at about 237 W/m-K against 52 for bare cast iron. Bare cast iron holds heat better (very high against low). Choose bare cast iron for searing, cornbread, shallow frying, anything that benefits from a pan that does not lose heat when cold food lands in it, and PTFE nonstick for eggs, pancakes, delicate fish, and anything that would weld itself to bare metal.
Conductivity figures are published material properties. Oven ceilings are what manufacturers publish for each class of cookware.
| Bare cast iron | PTFE nonstick | |
|---|---|---|
| Conductivity | 52 W/m-K | 237 W/m-K aluminium body |
| Heat retention | very high, because of mass rather than conductivity | low |
| Responsiveness | low, it takes several minutes to preheat and just as long to cool | very high |
| Evenness | poor while heating, excellent once fully preheated | good, because aluminium conducts extremely well |
| Induction | Yes | Depends |
| Oven ceiling | 700F | 400F |
| Reactive with acid | Yes | No |
| Needs seasoning | Yes | No |
| Weight | very heavy | light |
Which one heats faster?
PTFE nonstick, by a wide margin: the aluminium body of PTFE nonstick conducts at about 237 W/m-K against 52 for bare cast iron. Conductivity is how quickly heat moves through the metal, so a high figure means the pan reaches an even temperature sooner and spreads the burner's heat across the base rather than concentrating it.
Conductivity is not the same as heat retention, and confusing the two is the most common misunderstanding about cookware. Cast iron conducts poorly at about 52 W/m-K and retains heat extremely well, because retention comes from mass and specific heat rather than from conductivity. That is precisely why iron sears well: the pan barely drops in temperature when cold food lands on it.
Which one suits which job?
Bare cast iron is best for searing, cornbread, shallow frying, anything that benefits from a pan that does not lose heat when cold food lands in it. Cast iron is not a good conductor. Its advantage is heat capacity: a thick, hot pan holds its temperature when a steak hits it, which is what actually produces a crust.
PTFE nonstick is best for eggs, pancakes, delicate fish, and anything that would weld itself to bare metal. A nonstick pan is a consumable, not an heirloom. Coatings wear out with normal use, and a worn one should be replaced rather than scrubbed harder.
Practical differences that decide it
Induction: Bare cast iron works on induction and PTFE nonstick works on induction only with a magnetic base. That alone settles the question for anyone with an induction hob.
Acid: Bare cast iron is reactive, meaning long acidic cooking strips seasoning or discolours the surface, so tomato and wine braises belong in PTFE nonstick. Oven ceiling: 700F against 400F, remembering that the handle usually decides the real limit rather than the material.
Weight and upkeep: bare cast iron is very heavy and PTFE nonstick is light. Bare cast iron needs a maintained seasoning layer, which is oil polymerised onto the metal by heat, built up with use and stripped by detergent or a dishwasher.
The honest conclusion
Most kitchens should own both rather than choosing. They are good at different things, and neither is a substitute for the other. A mixed kitchen outperforms a matched one at every budget, which is the single most useful thing to understand about buying cookware.
If you genuinely have to pick one, pick on the job you do most often. For searing and browning, that is bare cast iron. For sauces and anything that needs quick control, PTFE nonstick spreads heat faster.
Pans in both materials
- Lodge
Lodge Pre-Seasoned Cast Iron Skillet, PFAS-Free, 10.25 Inches
10.25 inUnder $25 Check priceBudget band; Amazon shows the current price - CAROTE
CAROTE 12 Inch Classic Granite Non Stick Black Frying Pan, PFOA-Free
12 inUnder $50 Check priceBudget band; Amazon shows the current price - Tramontina
Tramontina Signature Tri-Ply Clad Stainless Steel 10-Inch Frying Pan
10 inUnder $50 Check priceBudget band; Amazon shows the current price - Lodge
Lodge Pre-Seasoned Cast Iron Skillet Set, 8, 10.25 and 12 Inches
12 inUnder $100 Check priceBudget band; Amazon shows the current price - All-Clad
All-Clad D3 Stainless Steel Fry Pan Set, 10&12-inch, Made in the USA
12 inUnder $250 Check priceBudget band; Amazon shows the current price
Common questions
Which is better, bare cast iron or PTFE nonstick?
Neither, in the abstract. Bare cast iron is best for searing, cornbread, shallow frying, anything that benefits from a pan that does not lose heat when cold food lands in it. PTFE nonstick is best for eggs, pancakes, delicate fish, and anything that would weld itself to bare metal. Most kitchens benefit from owning both, because no single cookware material performs well at searing, at delicate release, at long acidic cooking and at rapid response.
Which heats up faster?
PTFE nonstick, at about 237 W/m-K against 52, a figure that belongs to its aluminium body. Higher conductivity means heat spreads through the pan more quickly, so it comes to an even temperature sooner. It says nothing about how well the pan holds that heat once food goes in.
Which is better for searing?
Bare cast iron. PTFE nonstick is out of the running, because a nonstick coating cannot be run at searing temperatures. Bare cast iron has very high heat retention and takes the high heat a sear needs. Searing is decided by how little the pan cools when cold food lands, which comes from mass and specific heat rather than conductivity.
Which works on induction?
Bare cast iron works on induction and PTFE nonstick works on induction only with a magnetic base. Induction couples only to ferromagnetic metal, so a fridge magnet on the base settles it definitively regardless of what the packaging says.
Which lasts longer?
Bare cast iron, without question. A coated pan is a consumable: the coating wears out with normal use over a few years and the pan is then replaced rather than repaired. Bare metal cookware outlives the person who bought it.
