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Thread: Something challenging for brilliant minds

  1. #1 Something challenging for brilliant minds 
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    HI, I am at MIT working on a project, I am trying to find a combination of whatever (plastics, minerals, earthy materials) to create something, the tricky part is that the combinations of whatever we come up with needs to be able to get this density measures 4.533 g/cm3 and 5.44 g/cm3 and it needs to be biodegradable.

    I don't know if I am making my point, I am trying to make airsoft bbs, heavyweight airsoft bbs that are not as expensive as they are right now, but I can't find any materials to make them and now I am completely blocked, I've tried many things minerals, bioplastics, different kind of powders but nothing seems to be as dense as I want.

    so I am turning into smarter people so I hope that you can help me or give me some advice or recommendation


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  3. #2  
    exchemist
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    Quote Originally Posted by PabloGaxiola35 View Post
    HI, I am at MIT working on a project, I am trying to find a combination of whatever (plastics, minerals, earthy materials) to create something, the tricky part is that the combinations of whatever we come up with needs to be able to get this density measures 4.533 g/cm3 and 5.44 g/cm3 and it needs to be biodegradable.

    I don't know if I am making my point, I am trying to make airsoft bbs, heavyweight airsoft bbs that are not as expensive as they are right now, but I can't find any materials to make them and now I am completely blocked, I've tried many things minerals, bioplastics, different kind of powders but nothing seems to be as dense as I want.

    so I am turning into smarter people so I hope that you can help me or give me some advice or recommendation
    You're right, not many minerals are this dense. Most rocks only have an SG of 2-3. I think Olivine may approach 4. However some heavy metal oxides could get you there. Haematite for instance has a density of 5.3 or so. But biodegradable? Nope. Though it is fairly natural I suppose.

    You are up against the Periodic Table, I'm afraid. To get high densities you are going to have to include compounds of heavy elements. There is no way round it, that I can see.


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