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Microwave Milk Stirrer

by tmackay Apr 6, 2016
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I have to note that following plastics are NOT SAFE for using in the microwave:

  • PE (polyethylene)
  • PP (polypropylene)
  • PC (polycarbonate)
  • PET (polyethylene terephthalate)
  • PA (polyamide)
  • ABS (acrylonitrile butadiene styrene)
  • SEBS / TPE elastomers

The following are SAFE:

  • homopolymeric polypropylene (HPP): max. 120°C
  • polybutylene terephthalate (PBT): max. 160°C
  • polysulfone (PSU): max. 160°C
  • liquid crystalline polymere (LCP): max. 230°C
  • polyethersulfone (PES): max. 200°C
  • polyetherimide (PEI): max. 200°C

I couldn't find much definitive info on this point. Certainly ABS in direct contact with food is a concern due to the potential of leached chemicals, hence the design does not use integrated stirrer. Also its relatively low melting point of around 105 degrees C could be a problem, but it is still cool to the touch when removed as there is not a lot of steam produced by the liquid to transfer heat to the ABS sitting above the mug. The printed device is not containing the liquid after all.