The thing that blows my mind is that sippy cups like the Stanley kind that aren't even leak-proof have about the same level of insulation as fully gasket sealed designs. It's like 70 to 80%, at least for keeping things cool. Maybe the difference in heat retention is bigger.
Radiative head transfer is where the insulation might not act the same for hot contents as cold contents. If there is an IR reflective coating on the outside of the inner chamber then that could help prevent heat from getting in, but do nothing to keep it from leaving.
Good point. I'm planning a big insulation test video that compares hot and cold tests against both dual and triple layer bottles (the ones with copper to help with radiation heat transfer). Hopefully that will give a better idea if the triple layer really does help for certain situations or if it's relatively insignificant compared to the vacuum seal's impact.
Have you tested for something hotter than hot tap water? I did a test to see which kept coffee hot longest using my Keurig and Master Stanley series kept it above 140°F for about 24 hours with Thermos being a close 2nd. In your list were the bottles ranked by the ones in the back shelf? I ask because when I tested mine Stanley outperformed every other brand I tested including ozark trail.
Interesting, which Stanley did you use? The Master series one you mentioned that's like a thermos? Or their tumbler? Their thermos-style bottle did really well with an ice tests I did awhile back, and it's been awhile since I've tested that one. It should test a lot better than their tumblers though. The shelf is just organized by color, not by any ranking. I haven't done boiling water tests. I normally compare quite a few ~32oz bottles, and that would be a huge volume to boil. So I've mostly stuck to hot water tests with hot tap water because it's faster and easier. And the resulting rankings should be the same, so my tests have mostly been designed to rank bottles against each other instead of testing real-world scenarios like ice or brewed coffee. But I'm planning a BIG insulation test video with all my bottles since it's been fairly piecemeal to this point. Looking to test them all with ice too and possibly coffee on some of them, so that should be an interesting one.
@bottlepro3252 My test was with the 1.4qt Master Stanley Thermos ≈ 44.8oz . I tested it against 40oz Takeya, 1.1qt Stanley Classic, and 40oz Stainless King style Thermos. For my test I started them all at ≈175°F Master Stanley stayed hot longest which I chose as 120°F which is the hottest temperature I could drink coffee. During my test the Master Stanley only dropped to 122.4°F after 41 hours none of the thermoses tested were preheated. Takeya was 111.6°F after 13.8 hours. Stanley Classic was 122.2°F after 28.6 hours and 113.5°F after 36 hours. The Thermos brand also did really well only dropping down to 120.2°F after 41 hours. I've tested way more in 16oz and 32 Oz as well. When I tested Hydroflask against similar style like fifty/fifty, and Iron Flask and a few others Hydroflask performed worse than every knock off or copy cat brand I compared it with same size. Although what I found very interesting was when I tested multiple tumbler styles Hydroflask tumbler performed the best. For Thermos Style best were Stanley, Zojirushi, and Thermos I haven't analyzed all my data from tumbler test but best one was Hydroflask tumbler but it was much closer with Yeti and Stanley and other brands I tested. My favorite test was comparing all the Thermos style or larger insulated bottles. I even got really old Stanley's to test from as early as 1960's and modern China made ones perform just as well as the old school ones from every decade since then.
The thing that blows my mind is that sippy cups like the Stanley kind that aren't even leak-proof have about the same level of insulation as fully gasket sealed designs. It's like 70 to 80%, at least for keeping things cool. Maybe the difference in heat retention is bigger.
Radiative head transfer is where the insulation might not act the same for hot contents as cold contents. If there is an IR reflective coating on the outside of the inner chamber then that could help prevent heat from getting in, but do nothing to keep it from leaving.
Good point. I'm planning a big insulation test video that compares hot and cold tests against both dual and triple layer bottles (the ones with copper to help with radiation heat transfer). Hopefully that will give a better idea if the triple layer really does help for certain situations or if it's relatively insignificant compared to the vacuum seal's impact.
You done frank green water bottles? Extremely popular in Australia nearly every person has one. Due to being high customisable like some other brands.
I haven't yet, but I've seen people mention those. The ceramic lining is something I haven't tried or looked into before.
Have you tested for something hotter than hot tap water?
I did a test to see which kept coffee hot longest using my Keurig and Master Stanley series kept it above 140°F for about 24 hours with Thermos being a close 2nd.
In your list were the bottles ranked by the ones in the back shelf?
I ask because when I tested mine Stanley outperformed every other brand I tested including ozark trail.
Interesting, which Stanley did you use? The Master series one you mentioned that's like a thermos? Or their tumbler? Their thermos-style bottle did really well with an ice tests I did awhile back, and it's been awhile since I've tested that one. It should test a lot better than their tumblers though.
The shelf is just organized by color, not by any ranking.
I haven't done boiling water tests. I normally compare quite a few ~32oz bottles, and that would be a huge volume to boil. So I've mostly stuck to hot water tests with hot tap water because it's faster and easier. And the resulting rankings should be the same, so my tests have mostly been designed to rank bottles against each other instead of testing real-world scenarios like ice or brewed coffee.
But I'm planning a BIG insulation test video with all my bottles since it's been fairly piecemeal to this point. Looking to test them all with ice too and possibly coffee on some of them, so that should be an interesting one.
@bottlepro3252 My test was with the 1.4qt Master Stanley Thermos ≈ 44.8oz . I tested it against 40oz Takeya, 1.1qt Stanley Classic, and 40oz Stainless King style Thermos.
For my test I started them all at ≈175°F
Master Stanley stayed hot longest which I chose as 120°F which is the hottest temperature I could drink coffee.
During my test the Master Stanley only dropped to 122.4°F after 41 hours none of the thermoses tested were preheated. Takeya was 111.6°F after 13.8 hours. Stanley Classic was 122.2°F after 28.6 hours and 113.5°F after 36 hours.
The Thermos brand also did really well only dropping down to 120.2°F after 41 hours.
I've tested way more in 16oz and 32 Oz as well. When I tested Hydroflask against similar style like fifty/fifty, and Iron Flask and a few others Hydroflask performed worse than every knock off or copy cat brand I compared it with same size. Although what I found very interesting was when I tested multiple tumbler styles Hydroflask tumbler performed the best.
For Thermos Style best were Stanley, Zojirushi, and Thermos
I haven't analyzed all my data from tumbler test but best one was Hydroflask tumbler but it was much closer with Yeti and Stanley and other brands I tested. My favorite test was comparing all the Thermos style or larger insulated bottles.
I even got really old Stanley's to test from as early as 1960's and modern China made ones perform just as well as the old school ones from every decade since then.