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It has the good heat conduction properties of aluminum and the safety of the anodized coating.
Aluminum is second to copper when it comes to desirable heating qualities. Both react quickly to changes in the fire. Copper has a greater capacity to hold heat; aluminum loses it as fast as it gains it.
Anodizing is a chemical/electrolytic process whereby an oxide (which is essentially corrosion) is placed on the surface of the aluminum to act as a decorative and protective finish. If intact, anodizing is a great surface for cooking. The downside is that its a coating. Coating can wear off or be scratched. Hard anodized, however, overcomes much (but not all) of this.
I have owned some early anodized aluminum (before the word 'Calphalon' was even invented). My son has it now, so it has been in service for well over 20 years. In that time, two pieces have been damaged. The 3 qt sauce pan has seen the coating wear completely away on the inside, below the line where it is filled with liquid. We used it to make tomato sauce. I am sure the acid wore the coating away (meaning we ingested it!). The other pot was used to deep fry, was overheated, and the frying oil boiled over. This happened after my son got the stuff and his girlfriend is the culprit. The frying oil burned onto the surface and will not - no matter what he's tried - come off. Obviously the second pot's damage could happen to anything. The first pot's loss of coating is entirely the fault of the coating. Knowing what i know about more modern hard anodizing, I suspect the newer coatings will not be as susceptible to this as was our old stuff.
All in all, if you want Calphalon, go for it. On balance, it is as good a product as any out there.
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