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How do insulated cups work: Overview for Insulating Cups
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How do insulated cups work: Overview for Insulating Cups: There’s a vacuum insulated layer between the double walls of the insulated cup, it was made by vacuum technique to eliminate the air to create the vacuum layer, because the heat can not be transfer without air, the vacuum layer can stop heat flow from inside to outside and from outside to inside
![https://www.bulkflask.com/wp-content/uploads/2023/09/structure-of-vacuum-insulated-tumbler.jpg](https://www.bulkflask.com/wp-content/uploads/2023/09/structure-of-vacuum-insulated-tumbler.jpg)
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304 Stainless Steel Insulation Cup For Work Students Breakfast Cup Sealed Soup Cup Small Portable Insulation Soup Can Lunch Box - AliExpress
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12 oz Travel Mug
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