It says, “Keeps drinks cold longer!” Are they double-walled? Longer than what… plastic cups? Plastic is a great insulator, stainless steel is not - so it only keeps drinks cold longer if you are drinking in Antarctica.
@sdansmith Longer than aluminum. Somewhat longer than glass; stainless is not a really good heat conductor, which is why tne bottoms of stainless pots are heavily clad with aluminum. In baking, a plain steel cookie sheet will produce much browner bottoms on the cookies than stainless. A stainless muffin tin is just a terrible idea.
@werehatrack Who has aluminum party cups? The most common are plastic, styrofoam, and glass. Steel is 1,700 times more heat conductive than styrofoam, 100 times more conductive than a plastic Solo cup, and 60 times more conductive than glass.
Making this claim and not directly referencing an unlikely aluminum cup that one might only find in a Navy destroyer mess hall makes someone go, “Hmmmmm…”
Side note: Lol… check out the claim by the vendors of this aluminum party cup regarding a “better cold experience” when using it. That’s getting REALLY creative regarding your beer warming up.
Conductivity in Aluminum
Pure aluminum has a thermal conductivity of about 235 watts per kelvin per meter. Aluminum alloys tend to have much lower conductivity. However, this is rarely as low as iron and steel. Aluminum is often used in electronic heat sinks due to the metal’s good thermal conductivity.
Conductivity in Carbon Steel
The thermal conductivity of carbon steel is much lower than that of aluminum. Its thermal conductivity is around 45 watts per kelvin per meter. This material is a good and economical choice for building structural components.
Conductivity in Stainless Steel
Stainless steel has an even lower conductivity than carbon steel at about 15 watts per kelvin per meter.
My recollection is that aluminum was popular as a colorful and shatterproof alternative to both glass and the sometimes-fragile plastic drinkware of the postwar era. We had some. I think there may still be one in a box in the attic.