Bare cast iron vs PTFE nonstick
Quick answer
PTFE nonstick conducts heat faster, at about 237 W/m-K against 52. Bare cast iron holds heat very high, because of mass rather than conductivity and PTFE nonstick holds it low. Choose bare cast iron for searing, cornbread, shallow frying, anything that benefits from a pan and ptfe nonstick for eggs, pancakes, delicate fish, and anything that would weld itself to
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 |
| 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, and by a wide margin: about 237 W/m-K against 52. Conductivity is how quickly heat moves through the metal, so a high figure means the pan reaches an even temperature sooner and responds faster when you change the burner.
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 at 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 at 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 is yes and PTFE nonstick is depends. 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 the other one. 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. Searing and browning point toward whichever of these holds more heat. Sauces and anything that needs quick control point toward whichever conducts faster.
Pans in both materials
- Lodge
Lodge Pre-Seasoned Cast Iron Skillet, PFAS-Free, 10.25 Inches
10.25 in$24.90 Check pricePrices change often - CAROTE
CAROTE 12 Inch Classic Granite Non Stick Black Frying Pan, PFOA-Free
12 in$27.99 Check pricePrices change often - Lodge
Lodge Pre-Seasoned Cast Iron Skillet with Silicone Handle Holder, 12 Inches
12 in$34.90 Check pricePrices change often - Lodge
Lodge Pre-Seasoned Cast Iron Skillet Set, 8, 10.25 and 12 Inches
12 in$64.90 Check pricePrices change often - All-Clad
All-Clad D3 Stainless Steel Fry Pan Set, 10&12-inch, Made in the USA
12 in$249.99 Check pricePrices change often
Common questions
Which is better, bare cast iron or ptfe nonstick?
Neither, in the abstract. Bare cast iron is best at 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 at 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. Higher conductivity means heat spreads through the pan more quickly, so it comes to an even temperature sooner and reacts faster when the burner changes. It says nothing about how well the pan holds that heat once food goes in.
Which is better for searing?
The one that holds more heat, which here is Bare cast iron. Searing is decided by how little the pan cools when cold food lands, which comes from mass and specific heat rather than conductivity. A thick, fully preheated pan produces a crust that a thin, highly conductive one cannot.
Which works on induction?
Bare cast iron works on induction and PTFE nonstick is depends. 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.