Solidteknics pans are designed with the correct concave to compensate for expansion/contraction. We're mechanical engineers and put it in to compensate for the movement of the base at high temperatures.
There must be a concave when cold, otherwise, every pan would bow out convex under heat ('spinner' on glass). Should every pan flatten? No. Each pan model's concave is carefully designed to approach flat under common conditions. Problem is, every condition is different. Even for the same temperature, the heat delivered to the pan comes in many different forms (gas, IR, induction, etc), and many different sizes (eg. very wide gas vs very narrow for cheap induction). We can only engineer for the average, then there will be slightly different movements for everyone. It isn't true that the pans will always flatten out. They are designed to approach flat, though it is best to leave some concave to avoid 'spinners'.
Without a small concave, the pan would otherwise bow out convex, becoming a 'spinner' (like a bowl) causing lasting deformation to the pan and it subsequently becomes unusable on smooth stovetops: this is far worse than a little concave when the pan is relatively cool. The small amount of concave doesn't affect cooking performance, even on infrared or electric hot plates.
Solidteknics have done lots of research into finding the perfect concave. All good quality large steel and cast-iron pans need a concave base.
Thus, some concave is good, a 2-3 mm curve/bow is fine and perfectly normal when hot, for most cooking (varies with temp). The most uneven movement comes from small high-power induction or electric on large pans, where the centre of the pan moves a lot more than the outer edges. As you may know, it is important that the burner is well matched to the pan size.
The most uneven movement comes from small high-power induction or electric on large pans, where centre of pan moves a lot more than the outer edges.
If you are unable to match the element size to the pan, you will be best to heat the pan slowly to your desired temperature, this allows the heat to spread evenly across the surface rather than being focused on one area.
Please watch the below video showing examples of the concave.
You can read more about why all quality cookware manufacturers also pre-concave their bases - see here.
Many may think that a pans base must be absolutely 100% flat. This is not true: given metal expands when heated.
If you still think your pan has more than normal concave after checking the base with a straight edge and seeing more than 3mm gap, please let Solidteknics know via email email@example.com with photos, so we can see if your pan is one of the rare ones that warps more than normal, and needs replacing under warranty.
To put the defect rate into perspective, Solidteknics have shipped over 100,000 pans, and only replaced around 3 dozen for genuine warping.
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