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  1. #1
    Murray@uptowngallery's Avatar
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    Benzotriazole and KBr appearance

    I got my order from Photog's Formulary today.

    Two items had a surprising appearance...

    The benzotriazole wasn't a powder but looked like spun fibreglass - long white strands..is that normal?

    The KBr (potassium bromide) was in rocky chunks...I guess if one makes a huge bottle of it, a rock can be weighed & the water volume selected accordingly. I wanted to make a small volume but didn't realize I needed a mortar & pestle.

    I have a spice/coffee grinder I plan to use to pulverize acetaminophen...I guess I could do that to have some control over how much chemical. Don't want airborne dust however...

    Welcome to DIY, huh?
    Murray

  2. #2

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    I have benzo from photog's form. It is 'fluffy and needle-like' in appearance. Like cotton-candy almost. I believe it's normal (and really tough to get to dissolve!)

  3. #3
    Akki14's Avatar
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    You'll probably get less dust with careful handgrinding with a mortar & pestle than with one of those impossible-to-clean-100% coffee grinders, IMO.
    ~Heather
    oooh shiny!
    http://www.stargazy.org/

  4. #4
    Murray@uptowngallery's Avatar
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    This machine has a blade rather than a mill/grinder arrangement. I think it would be a good idea to never use it for food again...

    I had a mortar and pestle as a kid with a science kit...I wonder what suspicion I would generate buying one these days...no worse than having a garage full of chemicals I guess.

    Thanks for the appearance-verification, PPD.
    Murray

  5. #5
    eclarke's Avatar
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    Murray,
    A cheap hotplate from Walmart set on low,low heat will help you dissolve the benzotriazole and is useful for all formulation. If you could find a nice Corning heated stirrer, you will be in formulating heaven. You can probably get a good mortar and pestle at any Asian food market....EC

  6. #6
    Akki14's Avatar
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    Mortar and pestles must be more common over here for kitchen stuff; they seem rather ubiquitous. I know what kind of coffee grinder you're talking about, my parents had/have one of those (and it's hard to get a decent even grind with it) and it does kick up some dust as it's going and when you open the top up.
    ~Heather
    oooh shiny!
    http://www.stargazy.org/

  7. #7
    juan's Avatar
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    The appearance of both is normal. The KBr pellets will dissolve with stirring. I've done it by hand, but it's much easier with my magnetic stirrer.
    juan

  8. #8
    Murray Kelly's Avatar
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    I disolved benzotriazole in denatured alcohol. 1% (1g in 100ml) is 10mgm/ml.
    Disolved easily.

    Murray
    Brisbane

  9. #9
    Mike Wilde's Avatar
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    Chunky Bromide

    get used to it - it will always chunk up. I have a small (3" dia) mortar and pestle devoted to just this chemical. I also ocassionally get a good sized pair of pliers down into my container of it to break up big chunks before I consign the smaller bits to grinding. Most of the time it is easier to make up a 10% solution of bromide in hot distilled water, and then just measure out the required mL to get the weight that a formula calls for. This means the pestle sees only seasonal use when the bromide bottle gets empty.

    I deal with the BTZ the same stock solution way except I make it up as a 1% solution, since it is usually needed in such small amounts. Yes the material is certienly finely divided. One purchase of the stuff though, is usually a lifetime supply.

  10. #10

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    The BTZ if fine; white needle-like appearance, and it will dissolve readily in hot water. As already mentioned, Kbr will always form 'rocks'. It breaks up fairly easily and dissolves very easily too.

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