Thermos Challenge

Thermos Prototypes:

Testing Procedure

  1. Put on safety goggles.
  2. Heat up 150ml of water in a beaker on a hot plate set to high to 100 °
  3. Take the initial temperature of the hot water as soon as it poured into the prototype thermos. Record the temperature and quickly place the cap on the thermos.
  4. Leave the water for 20 minutes and observe any changes in heat on the outside of the thermos.
  5. Remove cap and record temperature of the water. Calculate final and initial temperature difference and divide by 20 to get temperature loss per minute. (Difference should be around 8.3 ideally.)
  6. Note any flaws and possible improvements that could be made to the design.
  7. Make improvements based on the notes and repeat procedure with the next prototype.

Prototype #1


  • 500mL glass bottle
  • 6cm sqr aluminum foil
  • 1 sheet of newspaper
  • Starbucks plastic cup
  • Balloon

Temp Difference: 42.9


-Steam and bubbles condensed on the inside of the glass

-Steam and absorbed heat on the outside plastic bottle shell, causing it to expand

-Tape is starting to detach due to steam

-Cap starting to heat up at 12 min

-Rubber balloon on the cap is starting to expand due to steam

Prototype #2

Temp Difference: 26


  • Heat coming off the side but top is not hot
  • No moisture leaking

Prototype #3

Temp Difference: 22

Notes: Slightly warm on the bottom, plastic shell generally good at keeping heat within


Prototype #4


Temp Difference: 22


-Slightly warm on the bottom, plastic shell generally good at keeping heat within


Final Product:


  • 3D Case
  • Glass bottle
  • Cork
  • Newspaper
  • Aluminium foil
  • paint
  • Tape
  • Balloon
  • Felt

Final Results:

There was a loss of 33 degrees after an hour of pouring the water into the Thermos.

Kleaner Kanteen 3D Print


We chose to have 2 main body layers and insulated the in-between as tightly and sealed as possible to lose the least amount of heat while also keeping in consideration a profitable budget and reasonable material, looks and aesthetics of a product an actual consumer would be interested in purchasing. we chose a glass interior due to it having good thermal conductivity and also being able to store water well and show a quality product with a 3D print exterior for a modern look while having good heat insulation. we used a cork seal along with rubber lining to keep in as much heat as we could.

More Pictures:


Core Competency

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