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Thread: Heat gun food grade?

  1. #1
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    Heat gun food grade?

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hello all,

    I'm just about to venture into roasting my own coffee. My first pick is the heat-gun/flour sifter method. However, I have a concern about the food safety element of using the heat gun. The core components (https://www.ifixit.com/Guide/Hot+air+gun+Disassembly/71732) of the heat gun is just a heating element ( Nichrome/mica with an insulating cover made out of kapton/mica paper ) and a dc motor/fan encased in stainless steel. However, given it was never intended for roasting coffee I wonder how much concern the community has with volatiles or chemical coatings used during manufacture that may be blasting out during use. They may meet safety requirements for stripping paint but may not be so great to coat your coffee for consumption?

    Is anyone here familiar with MICA/kapton for use in heating food?


    Regards
    Dylan
    Last edited by dylan; 22nd January 2019 at 10:05 PM.

  2. #2
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    Hi Dylan, great question. Will be interested to see what answers you get or find.

    I would be predominantly worried about the hot air path which is thankfully short.

  3. #3
    Senior Member Yelta's Avatar
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    I'd be far more concerned about fumes produced when stripping paint with a heat gun.

    I guess the answer to your question is, if the process concerns you, don't do it.
    deegee and Mazzerati like this.

  4. #4
    Senior Member Lyrebird's Avatar
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    Mica is GRAS (generally regarded as safe) when used as a food additive: it is used to give pearlescence to things like cake decorations.

    Info on Kapton is harder to come by but it has been evaluated for bioimplantation (way higher standard than food grade) so it's probably OK.
    Last edited by Lyrebird; 23rd January 2019 at 09:37 AM.
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  5. #5
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    Looking at the hair dryer breakdown (https://www.ifixit.com/Guide/Conair+...lacement/25668) the heating element looks the same. Not saying you can interchange a heat gun with a hair dryer just noting the similarities.

  6. #6
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    I may look at putting a high-temperature air filter between it and the beans. Any thoughts on this?

  7. #7
    Senior Member Yelta's Avatar
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    Behmor Coffee Roaster
    Why not simply buy a Behmor or similar, much simpler and probably cheaper than trying to reinvent the wheel.
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