Why is putting hot milk in a thermos not recommended?





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A colleague of mine just got a new thermos (inox), this model, and actually read all instruction, and we were surprised to read that it is not recommended to pour hot milk in the thermos.



My opinion was that:




  1. Unlike tea of coffee, a lot of micro-organisms live in milk, will end up being a favorable place for those micro-organisms to generate a culture (which will be more and more difficult to get rid off, and will contaminate any other fluid poured in the thermos)

  2. If you don't wash it straight away, it will really stink.

  3. The milk being full of water-insoluble proteins/fat, it will "coat" the internal thermos walls (gross!) - I've already seeing that "coat" forming in plastic containers, and I guess it won't be any different in inox containers.


I've actually not found an answer online, so I thought that here I could find some experts. I realize this could be a cross-question for Biology SE, but I felt it more food-related.










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  • 1




    thermos.co.uk/UK_careuse_stainless_steel_vacuum_flask.aspx here are the instructions for a similar model flask for reference. Note that they recommend its because of the possibility of bacterial growth.
    – J.Doe
    8 hours ago

















up vote
24
down vote

favorite
2












A colleague of mine just got a new thermos (inox), this model, and actually read all instruction, and we were surprised to read that it is not recommended to pour hot milk in the thermos.



My opinion was that:




  1. Unlike tea of coffee, a lot of micro-organisms live in milk, will end up being a favorable place for those micro-organisms to generate a culture (which will be more and more difficult to get rid off, and will contaminate any other fluid poured in the thermos)

  2. If you don't wash it straight away, it will really stink.

  3. The milk being full of water-insoluble proteins/fat, it will "coat" the internal thermos walls (gross!) - I've already seeing that "coat" forming in plastic containers, and I guess it won't be any different in inox containers.


I've actually not found an answer online, so I thought that here I could find some experts. I realize this could be a cross-question for Biology SE, but I felt it more food-related.










share|improve this question









New contributor




aechchiki is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
















  • 1




    thermos.co.uk/UK_careuse_stainless_steel_vacuum_flask.aspx here are the instructions for a similar model flask for reference. Note that they recommend its because of the possibility of bacterial growth.
    – J.Doe
    8 hours ago













up vote
24
down vote

favorite
2









up vote
24
down vote

favorite
2






2





A colleague of mine just got a new thermos (inox), this model, and actually read all instruction, and we were surprised to read that it is not recommended to pour hot milk in the thermos.



My opinion was that:




  1. Unlike tea of coffee, a lot of micro-organisms live in milk, will end up being a favorable place for those micro-organisms to generate a culture (which will be more and more difficult to get rid off, and will contaminate any other fluid poured in the thermos)

  2. If you don't wash it straight away, it will really stink.

  3. The milk being full of water-insoluble proteins/fat, it will "coat" the internal thermos walls (gross!) - I've already seeing that "coat" forming in plastic containers, and I guess it won't be any different in inox containers.


I've actually not found an answer online, so I thought that here I could find some experts. I realize this could be a cross-question for Biology SE, but I felt it more food-related.










share|improve this question









New contributor




aechchiki is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











A colleague of mine just got a new thermos (inox), this model, and actually read all instruction, and we were surprised to read that it is not recommended to pour hot milk in the thermos.



My opinion was that:




  1. Unlike tea of coffee, a lot of micro-organisms live in milk, will end up being a favorable place for those micro-organisms to generate a culture (which will be more and more difficult to get rid off, and will contaminate any other fluid poured in the thermos)

  2. If you don't wash it straight away, it will really stink.

  3. The milk being full of water-insoluble proteins/fat, it will "coat" the internal thermos walls (gross!) - I've already seeing that "coat" forming in plastic containers, and I guess it won't be any different in inox containers.


I've actually not found an answer online, so I thought that here I could find some experts. I realize this could be a cross-question for Biology SE, but I felt it more food-related.







storage-method milk






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edited yesterday









Peter Mortensen

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asked yesterday









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Check out our Code of Conduct.








  • 1




    thermos.co.uk/UK_careuse_stainless_steel_vacuum_flask.aspx here are the instructions for a similar model flask for reference. Note that they recommend its because of the possibility of bacterial growth.
    – J.Doe
    8 hours ago














  • 1




    thermos.co.uk/UK_careuse_stainless_steel_vacuum_flask.aspx here are the instructions for a similar model flask for reference. Note that they recommend its because of the possibility of bacterial growth.
    – J.Doe
    8 hours ago








1




1




thermos.co.uk/UK_careuse_stainless_steel_vacuum_flask.aspx here are the instructions for a similar model flask for reference. Note that they recommend its because of the possibility of bacterial growth.
– J.Doe
8 hours ago




thermos.co.uk/UK_careuse_stainless_steel_vacuum_flask.aspx here are the instructions for a similar model flask for reference. Note that they recommend its because of the possibility of bacterial growth.
– J.Doe
8 hours ago










3 Answers
3






active

oldest

votes

















up vote
54
down vote













The cleaning is one thing (there are flasks without hidden crevices that can be easily cleaned), but there’s also another point to consider:



A thermos flask that is doing its job will keep food warm, or rather, slow down the cooling process. Even if you fill it with fairly hot liquid, it will slowly cool. If you do that with a perishable food like milk, you will easily create an environment in the upper range of the danger zone, where food will become unsafe after as little as two hours.



Yes, you can argue that you are filling hot milk in a clean container, but in the end, it’ll be not safe by food safety standards. (What you make of that is obviously your choice.) The manufacturer’s warning will protect the end users from food poisoning.






share|improve this answer





















  • Comments are not for extended discussion; this conversation has been moved to chat.
    – rumtscho
    9 hours ago






  • 1




    "...will keep food warm" - or cold.
    – MrWhite
    23 mins ago


















up vote
16
down vote













It depends on the design. Some can't be washed properly, and milky liquids are much harder to clean off by rinsing than water or most water-based drinks



My genuine Thermos brand flask wouldn't be a problem because all the surfaces that come into contact with the food are accessible.



My previous small cheap flask had a pouring system in the lid that meant the contents passed through a non-washable chamber (clipped together in a way that wasn't designed to be opened). I eventually forced it open to find it full of hot chocolate residue. My flask is mainly used for kayaking, it has to be made up beforehand as fiddling about with powders when on a riverbank in the pouring rain doesn't tend to get you a hot drink when you need it. At that point it would have gone in the bin even if I hadn't just broken it.






share|improve this answer

















  • 3




    makes sense! I added a link to the model of the thermos I am talking about. true that in out case the chamber seems to be fairly accessible, but the top is very hard to disassemble and clean, thus milk can be stuck in there if you pour it through that top (what usually people do)
    – aechchiki
    yesterday






  • 5




    Yes, inside the inner lid is a hard-to-get-at incubator for all sorts of unpleasant life forms.
    – Chris H
    yesterday










  • FWIW, "my genuine Thermos brand flask" would be a problem since it has one of those "pouring systems" in the lid that is not entirely washable.
    – MrWhite
    28 mins ago


















up vote
0
down vote













Another aspect might be the engineering behind thermoses.



A thermos has a layer of vacuum between two layers of glass(At least back in the day it used to be like this),



This meant that the glass will break in case of rapid expansion due to hot liquids poured immediately. Milk has a higher heat capacity compared to diluted beverages, so that means it can hurt the flask even more.



Maybe they have engineered this problem away, but might be one of the reasons!
-BD.






share|improve this answer








New contributor




BikerDude is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.


















  • This is the reason why my grandma used to put a metal spoon in any glass she would pour any hot liquid into (tea, coffee...), to avoid it to be broke by the hot liquid. However i see here that milk has lower specific heat than water ( engineeringtoolbox.com/specific-heat-fluids-d_151.html) - is this what you are referring to?
    – aechchiki
    2 hours ago










  • Plus, nowadays the thermos (at least the model that I linked to in the question) are not made of glass anymore (safety issues I guess)
    – aechchiki
    2 hours ago











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3 Answers
3






active

oldest

votes








3 Answers
3






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
54
down vote













The cleaning is one thing (there are flasks without hidden crevices that can be easily cleaned), but there’s also another point to consider:



A thermos flask that is doing its job will keep food warm, or rather, slow down the cooling process. Even if you fill it with fairly hot liquid, it will slowly cool. If you do that with a perishable food like milk, you will easily create an environment in the upper range of the danger zone, where food will become unsafe after as little as two hours.



Yes, you can argue that you are filling hot milk in a clean container, but in the end, it’ll be not safe by food safety standards. (What you make of that is obviously your choice.) The manufacturer’s warning will protect the end users from food poisoning.






share|improve this answer





















  • Comments are not for extended discussion; this conversation has been moved to chat.
    – rumtscho
    9 hours ago






  • 1




    "...will keep food warm" - or cold.
    – MrWhite
    23 mins ago















up vote
54
down vote













The cleaning is one thing (there are flasks without hidden crevices that can be easily cleaned), but there’s also another point to consider:



A thermos flask that is doing its job will keep food warm, or rather, slow down the cooling process. Even if you fill it with fairly hot liquid, it will slowly cool. If you do that with a perishable food like milk, you will easily create an environment in the upper range of the danger zone, where food will become unsafe after as little as two hours.



Yes, you can argue that you are filling hot milk in a clean container, but in the end, it’ll be not safe by food safety standards. (What you make of that is obviously your choice.) The manufacturer’s warning will protect the end users from food poisoning.






share|improve this answer





















  • Comments are not for extended discussion; this conversation has been moved to chat.
    – rumtscho
    9 hours ago






  • 1




    "...will keep food warm" - or cold.
    – MrWhite
    23 mins ago













up vote
54
down vote










up vote
54
down vote









The cleaning is one thing (there are flasks without hidden crevices that can be easily cleaned), but there’s also another point to consider:



A thermos flask that is doing its job will keep food warm, or rather, slow down the cooling process. Even if you fill it with fairly hot liquid, it will slowly cool. If you do that with a perishable food like milk, you will easily create an environment in the upper range of the danger zone, where food will become unsafe after as little as two hours.



Yes, you can argue that you are filling hot milk in a clean container, but in the end, it’ll be not safe by food safety standards. (What you make of that is obviously your choice.) The manufacturer’s warning will protect the end users from food poisoning.






share|improve this answer












The cleaning is one thing (there are flasks without hidden crevices that can be easily cleaned), but there’s also another point to consider:



A thermos flask that is doing its job will keep food warm, or rather, slow down the cooling process. Even if you fill it with fairly hot liquid, it will slowly cool. If you do that with a perishable food like milk, you will easily create an environment in the upper range of the danger zone, where food will become unsafe after as little as two hours.



Yes, you can argue that you are filling hot milk in a clean container, but in the end, it’ll be not safe by food safety standards. (What you make of that is obviously your choice.) The manufacturer’s warning will protect the end users from food poisoning.







share|improve this answer












share|improve this answer



share|improve this answer










answered yesterday









Stephie

35.8k497132




35.8k497132












  • Comments are not for extended discussion; this conversation has been moved to chat.
    – rumtscho
    9 hours ago






  • 1




    "...will keep food warm" - or cold.
    – MrWhite
    23 mins ago


















  • Comments are not for extended discussion; this conversation has been moved to chat.
    – rumtscho
    9 hours ago






  • 1




    "...will keep food warm" - or cold.
    – MrWhite
    23 mins ago
















Comments are not for extended discussion; this conversation has been moved to chat.
– rumtscho
9 hours ago




Comments are not for extended discussion; this conversation has been moved to chat.
– rumtscho
9 hours ago




1




1




"...will keep food warm" - or cold.
– MrWhite
23 mins ago




"...will keep food warm" - or cold.
– MrWhite
23 mins ago












up vote
16
down vote













It depends on the design. Some can't be washed properly, and milky liquids are much harder to clean off by rinsing than water or most water-based drinks



My genuine Thermos brand flask wouldn't be a problem because all the surfaces that come into contact with the food are accessible.



My previous small cheap flask had a pouring system in the lid that meant the contents passed through a non-washable chamber (clipped together in a way that wasn't designed to be opened). I eventually forced it open to find it full of hot chocolate residue. My flask is mainly used for kayaking, it has to be made up beforehand as fiddling about with powders when on a riverbank in the pouring rain doesn't tend to get you a hot drink when you need it. At that point it would have gone in the bin even if I hadn't just broken it.






share|improve this answer

















  • 3




    makes sense! I added a link to the model of the thermos I am talking about. true that in out case the chamber seems to be fairly accessible, but the top is very hard to disassemble and clean, thus milk can be stuck in there if you pour it through that top (what usually people do)
    – aechchiki
    yesterday






  • 5




    Yes, inside the inner lid is a hard-to-get-at incubator for all sorts of unpleasant life forms.
    – Chris H
    yesterday










  • FWIW, "my genuine Thermos brand flask" would be a problem since it has one of those "pouring systems" in the lid that is not entirely washable.
    – MrWhite
    28 mins ago















up vote
16
down vote













It depends on the design. Some can't be washed properly, and milky liquids are much harder to clean off by rinsing than water or most water-based drinks



My genuine Thermos brand flask wouldn't be a problem because all the surfaces that come into contact with the food are accessible.



My previous small cheap flask had a pouring system in the lid that meant the contents passed through a non-washable chamber (clipped together in a way that wasn't designed to be opened). I eventually forced it open to find it full of hot chocolate residue. My flask is mainly used for kayaking, it has to be made up beforehand as fiddling about with powders when on a riverbank in the pouring rain doesn't tend to get you a hot drink when you need it. At that point it would have gone in the bin even if I hadn't just broken it.






share|improve this answer

















  • 3




    makes sense! I added a link to the model of the thermos I am talking about. true that in out case the chamber seems to be fairly accessible, but the top is very hard to disassemble and clean, thus milk can be stuck in there if you pour it through that top (what usually people do)
    – aechchiki
    yesterday






  • 5




    Yes, inside the inner lid is a hard-to-get-at incubator for all sorts of unpleasant life forms.
    – Chris H
    yesterday










  • FWIW, "my genuine Thermos brand flask" would be a problem since it has one of those "pouring systems" in the lid that is not entirely washable.
    – MrWhite
    28 mins ago













up vote
16
down vote










up vote
16
down vote









It depends on the design. Some can't be washed properly, and milky liquids are much harder to clean off by rinsing than water or most water-based drinks



My genuine Thermos brand flask wouldn't be a problem because all the surfaces that come into contact with the food are accessible.



My previous small cheap flask had a pouring system in the lid that meant the contents passed through a non-washable chamber (clipped together in a way that wasn't designed to be opened). I eventually forced it open to find it full of hot chocolate residue. My flask is mainly used for kayaking, it has to be made up beforehand as fiddling about with powders when on a riverbank in the pouring rain doesn't tend to get you a hot drink when you need it. At that point it would have gone in the bin even if I hadn't just broken it.






share|improve this answer












It depends on the design. Some can't be washed properly, and milky liquids are much harder to clean off by rinsing than water or most water-based drinks



My genuine Thermos brand flask wouldn't be a problem because all the surfaces that come into contact with the food are accessible.



My previous small cheap flask had a pouring system in the lid that meant the contents passed through a non-washable chamber (clipped together in a way that wasn't designed to be opened). I eventually forced it open to find it full of hot chocolate residue. My flask is mainly used for kayaking, it has to be made up beforehand as fiddling about with powders when on a riverbank in the pouring rain doesn't tend to get you a hot drink when you need it. At that point it would have gone in the bin even if I hadn't just broken it.







share|improve this answer












share|improve this answer



share|improve this answer










answered yesterday









Chris H

16.2k13048




16.2k13048








  • 3




    makes sense! I added a link to the model of the thermos I am talking about. true that in out case the chamber seems to be fairly accessible, but the top is very hard to disassemble and clean, thus milk can be stuck in there if you pour it through that top (what usually people do)
    – aechchiki
    yesterday






  • 5




    Yes, inside the inner lid is a hard-to-get-at incubator for all sorts of unpleasant life forms.
    – Chris H
    yesterday










  • FWIW, "my genuine Thermos brand flask" would be a problem since it has one of those "pouring systems" in the lid that is not entirely washable.
    – MrWhite
    28 mins ago














  • 3




    makes sense! I added a link to the model of the thermos I am talking about. true that in out case the chamber seems to be fairly accessible, but the top is very hard to disassemble and clean, thus milk can be stuck in there if you pour it through that top (what usually people do)
    – aechchiki
    yesterday






  • 5




    Yes, inside the inner lid is a hard-to-get-at incubator for all sorts of unpleasant life forms.
    – Chris H
    yesterday










  • FWIW, "my genuine Thermos brand flask" would be a problem since it has one of those "pouring systems" in the lid that is not entirely washable.
    – MrWhite
    28 mins ago








3




3




makes sense! I added a link to the model of the thermos I am talking about. true that in out case the chamber seems to be fairly accessible, but the top is very hard to disassemble and clean, thus milk can be stuck in there if you pour it through that top (what usually people do)
– aechchiki
yesterday




makes sense! I added a link to the model of the thermos I am talking about. true that in out case the chamber seems to be fairly accessible, but the top is very hard to disassemble and clean, thus milk can be stuck in there if you pour it through that top (what usually people do)
– aechchiki
yesterday




5




5




Yes, inside the inner lid is a hard-to-get-at incubator for all sorts of unpleasant life forms.
– Chris H
yesterday




Yes, inside the inner lid is a hard-to-get-at incubator for all sorts of unpleasant life forms.
– Chris H
yesterday












FWIW, "my genuine Thermos brand flask" would be a problem since it has one of those "pouring systems" in the lid that is not entirely washable.
– MrWhite
28 mins ago




FWIW, "my genuine Thermos brand flask" would be a problem since it has one of those "pouring systems" in the lid that is not entirely washable.
– MrWhite
28 mins ago










up vote
0
down vote













Another aspect might be the engineering behind thermoses.



A thermos has a layer of vacuum between two layers of glass(At least back in the day it used to be like this),



This meant that the glass will break in case of rapid expansion due to hot liquids poured immediately. Milk has a higher heat capacity compared to diluted beverages, so that means it can hurt the flask even more.



Maybe they have engineered this problem away, but might be one of the reasons!
-BD.






share|improve this answer








New contributor




BikerDude is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.


















  • This is the reason why my grandma used to put a metal spoon in any glass she would pour any hot liquid into (tea, coffee...), to avoid it to be broke by the hot liquid. However i see here that milk has lower specific heat than water ( engineeringtoolbox.com/specific-heat-fluids-d_151.html) - is this what you are referring to?
    – aechchiki
    2 hours ago










  • Plus, nowadays the thermos (at least the model that I linked to in the question) are not made of glass anymore (safety issues I guess)
    – aechchiki
    2 hours ago















up vote
0
down vote













Another aspect might be the engineering behind thermoses.



A thermos has a layer of vacuum between two layers of glass(At least back in the day it used to be like this),



This meant that the glass will break in case of rapid expansion due to hot liquids poured immediately. Milk has a higher heat capacity compared to diluted beverages, so that means it can hurt the flask even more.



Maybe they have engineered this problem away, but might be one of the reasons!
-BD.






share|improve this answer








New contributor




BikerDude is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.


















  • This is the reason why my grandma used to put a metal spoon in any glass she would pour any hot liquid into (tea, coffee...), to avoid it to be broke by the hot liquid. However i see here that milk has lower specific heat than water ( engineeringtoolbox.com/specific-heat-fluids-d_151.html) - is this what you are referring to?
    – aechchiki
    2 hours ago










  • Plus, nowadays the thermos (at least the model that I linked to in the question) are not made of glass anymore (safety issues I guess)
    – aechchiki
    2 hours ago













up vote
0
down vote










up vote
0
down vote









Another aspect might be the engineering behind thermoses.



A thermos has a layer of vacuum between two layers of glass(At least back in the day it used to be like this),



This meant that the glass will break in case of rapid expansion due to hot liquids poured immediately. Milk has a higher heat capacity compared to diluted beverages, so that means it can hurt the flask even more.



Maybe they have engineered this problem away, but might be one of the reasons!
-BD.






share|improve this answer








New contributor




BikerDude is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









Another aspect might be the engineering behind thermoses.



A thermos has a layer of vacuum between two layers of glass(At least back in the day it used to be like this),



This meant that the glass will break in case of rapid expansion due to hot liquids poured immediately. Milk has a higher heat capacity compared to diluted beverages, so that means it can hurt the flask even more.



Maybe they have engineered this problem away, but might be one of the reasons!
-BD.







share|improve this answer








New contributor




BikerDude is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this answer



share|improve this answer






New contributor




BikerDude is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









answered 2 hours ago









BikerDude

1




1




New contributor




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New contributor





BikerDude is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






BikerDude is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












  • This is the reason why my grandma used to put a metal spoon in any glass she would pour any hot liquid into (tea, coffee...), to avoid it to be broke by the hot liquid. However i see here that milk has lower specific heat than water ( engineeringtoolbox.com/specific-heat-fluids-d_151.html) - is this what you are referring to?
    – aechchiki
    2 hours ago










  • Plus, nowadays the thermos (at least the model that I linked to in the question) are not made of glass anymore (safety issues I guess)
    – aechchiki
    2 hours ago


















  • This is the reason why my grandma used to put a metal spoon in any glass she would pour any hot liquid into (tea, coffee...), to avoid it to be broke by the hot liquid. However i see here that milk has lower specific heat than water ( engineeringtoolbox.com/specific-heat-fluids-d_151.html) - is this what you are referring to?
    – aechchiki
    2 hours ago










  • Plus, nowadays the thermos (at least the model that I linked to in the question) are not made of glass anymore (safety issues I guess)
    – aechchiki
    2 hours ago
















This is the reason why my grandma used to put a metal spoon in any glass she would pour any hot liquid into (tea, coffee...), to avoid it to be broke by the hot liquid. However i see here that milk has lower specific heat than water ( engineeringtoolbox.com/specific-heat-fluids-d_151.html) - is this what you are referring to?
– aechchiki
2 hours ago




This is the reason why my grandma used to put a metal spoon in any glass she would pour any hot liquid into (tea, coffee...), to avoid it to be broke by the hot liquid. However i see here that milk has lower specific heat than water ( engineeringtoolbox.com/specific-heat-fluids-d_151.html) - is this what you are referring to?
– aechchiki
2 hours ago












Plus, nowadays the thermos (at least the model that I linked to in the question) are not made of glass anymore (safety issues I guess)
– aechchiki
2 hours ago




Plus, nowadays the thermos (at least the model that I linked to in the question) are not made of glass anymore (safety issues I guess)
– aechchiki
2 hours ago










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