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Shocked at Loss of Bean Mass when roasting!

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  • Shocked at Loss of Bean Mass when roasting!

    I did a 400 gram roast today in the BM. My own Costalumbian I pre blend.

    All went well, although under trying circumstances.

    At the end of the day I decided to weigh the lovely coffee beans after taking in their delectable aroma and proudly staring at them for a while, as one does. Well a CS anyway 8-)

    Shock horror! [smiley=evil.gif]

    They now weighed only 336 grams!! [smiley=huh.gif] which equals a 16% loss to chaff/smoke/steam? etc

    Now in all the roasts I have done previously I knew they lost weight, but never thought to weigh them post roast. And I thought Id been going through great quantities of beans in the last few weeks. Apparently not quite so much.

    So there ya go ...........

    Belinda

  • #2
    Re: Shocked at Loss of Bean Mass when roasting!

    Hi Belinda...

    The last roast I did (Brazilian) started at 300gm and finished with a roasted weight of 248 grams....

    About 18% weight loss....

    I think both your figure and the above are in the "normal" range.

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    • #3
      Re: Shocked at Loss of Bean Mass when roasting!

      I did a roast of PNG A grade (last of my starter pack) on the weekend, and started with 260gm and ended up with 210gm.

      About 19% weight loss!

      Wow!

      Comment


      • #4
        Re: Shocked at Loss of Bean Mass when roasting!

        Originally posted by Myrtle link=1160534386/0#2 date=1160535545
        I did a roast of PNG A grade (last of my starter pack) on the weekend, and started with 260gm and ended up with 210gm.

        About 19% weight loss!

        Wow!
        Yeppers....20% is by no means atypical

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        • #5
          Re: Shocked at Loss of Bean Mass when roasting!

          Yeah, I thought 16% probably wouldnt be a too dramatic loss in the big scheme of things.

          But after never having weighed post roast before it was still a bit of a shock though :-)

          I always imagined if I roasted 150 grams thats how much Id have to drink at the end of the day.

          But not so apparently :-/

          Just something to think about !!


          Belinda

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          • #6
            Re: Shocked at Loss of Bean Mass when roasting!

            Those are all in the normal range. Ive seen some beans/roasts as low as 15% and others as high as a 20% weight loss with most running around 17%.


            Java "All in a days roasting" phile
            Toys! I must have new toys!!!

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            • #7
              Re: Shocked at Loss of Bean Mass when roasting!

              Yeh, I roasted 320gs last night and ended up with 265g of roasted beans,,,,

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              • #8
                Re: Shocked at Loss of Bean Mass when roasting!

                i normally just go with 15% standard loss, thats typically what i get when i bother to weigh post roast.

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                • #9
                  Re: Shocked at Loss of Bean Mass when roasting!

                  With the number of beans I invariably tip over the side while tossing them around to cool them Ive had losses up to about 25% Im getting better with that now though, with a 400g roast of the PNG peaberry from the last poll coming out around 330g.

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                  • #10
                    Re: Shocked at Loss of Bean Mass when roasting!

                    Ive always understood it to be around a 20% mass change - I factored that into my early considerations of cost of beans (before I found coffee snobs that is!)

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                    • #11
                      Re: Shocked at Loss of Bean Mass when roasting!

                      Well, maybe I shouldve named the topic, "Shocked I never weighed the Post Roast before, When Everyone Else was Doing It" :-)

                      Seems Im the only one who didnt

                      So do certain beans lose more mass than others??


                      Belinda

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                      • #12
                        Re: Shocked at Loss of Bean Mass when roasting!

                        Originally posted by Corretto link=1160534386/0#10 date=1160546737
                        So do certain beans lose more mass than others??
                        Belinda
                        Belinda

                        It depends to a large extent on the initial water contect of the grean beans.... So yes, some do lose more that others...

                        I think (others with more knowledge and experience can shed more light on this) that it depends on the variety (region), how it was cleaned and washed, how it was stored etc.....

                        So a bean with a high water content will lose a lot more weight, and darker roasting will lose more compared to a light roast (but not sure how much extra you lose.... however if you go as far as charcoal there is no water left :)!!!

                        EDIT: commercial bean moisture content (quality beans ) ranges from 9-13% of total weight - then there is the weight of the chaff etc Some lesser quality beans can have > 13% water content (but will mold easily)..... roasting time/temperature needs to be adjusted to compensate for water content (so the experts say )

                        Expected total weight loss during roasting is 14 - 23% depending on bean variety and handling prior to roasting.

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                        • #13
                          Re: Shocked at Loss of Bean Mass when roasting!

                          I always account for 25% loss, regardless of bean. That way, if Im divying it out to friends and family, when I weigh it up, Ill often have 10-15g per batch in reserve. This means I dont have to roast too many extra batches for myself.

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                          • #14
                            Re: Shocked at Loss of Bean Mass when roasting!

                            While we are all throwing numbers around...

                            13%-17% is what I would have called typical (depending on roast depth mostly)

                            14% +/- 2% is a fairly typical water content for green beans from the suppliers so you guys further north in the more humid climates might start with a higher water content before roasting depending on how exposed your beans were and for how long they have been absorbing airborne wet stuff.

                            My 2.2c worth.

                            Comment


                            • #15
                              Re: Shocked at Loss of Bean Mass when roasting!

                              my simple brain likes, well, simplicity, so I just use 20%. 600gm green goes to 500gm roasted. 300->200, and thats about the extent of my calculations. Any more than that I open Excel

                              Perhaps I throw out more under- or over-roasted ones too, so i spill more of them around the place...

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