[Jewelry making - Article 00597] - Re: [Orchid] Inert environment in the kiln

[John Burgess]

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G'day

    I worked in a laboratory where an inert atmosphere was needed in a
    kiln - small furnace - and at first we had a second furnace to crack
    ammonia. But someone thought that as we were buying bottled gases,
    why couldn't the suppliers make up a simple mixture of hydrogen and
    nitrogen in the correct proportions.. Well, they boasted that they
    could supply any bottled gas wanted, from pure cyanogen to pure
    medical oxygen. So we bought bottled (cylinders) a mix of 3 parts of
    hydrogen to one part of nitrogen (Ammonia gas is NH3) which was very
    safe and did the job - and wasn't expensive. The supplier was the
    British Oxygen Co. Anhydrous ammonia gas can be very nasty indeed. 

Cheers for now,
JohnB of NZ
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