Cool place, SA, you can buy pre-mix heliox down there. Thats what I call 
service!

   Jim

On 11/17/97 8:32 AM Dennis JR Harding wrote:

>In South Africa there are several grades, amongst others ballon grade.  
>Apparently
>under law, Ballon or party grade is supposed to have 21% O2 content, so 
>what the supplies do
>is to add 20% O2 by volume.  This is to curb the number of increasing 
>blackouts that
>occur when people breathe pure He.
>
>There has been a significant increase in the number of outlets that 
>provide He filled ballons 
>for marketing purposes.  Especially at restaurants.  Nearly every 
>restaurant in the Johannesburg area
>that caters for family entertainmnet will give each child a ballon.
>
>There are also several other grades of He available, including that which 
>has been spectrographically analysed
>and that costs!
>
>Dennis Harding
>South Africa
>
>-----Original Message-----
>From:	John R. Rose [SMTP:rose@cs*.sc*.ed*]
>Sent:	15 November 1997 02:15
>To:	Kevin Connell
>Cc:	rose@cs*.sc*.ed*; cavers@ge*.co*; techdiver@aquanaut.com
>Subject:	Balloon grade Helium
>
>Kevin,
>
>When I jokingly referred to "balloon grade" helium, I had no idea that
>suppliers would actually "cut" helium with a cheaper gas.
>I was really referring to 99.99% pure helium. My supplier does NOT have
>a separate balloon grade.
>
>-John
>
>
>> Now I don't have first hand experience on this (my supplier doesn't do
>> this) but I've heard that some suppliers actually use a really low grade
>> helium and mix it with another cheaper gas (nitrogen) for a specific
>> "balloon" application.   This makes it cheaper than the pure industrial
>> stuff, but still floats balloons.  
>
>--
>Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
>Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
>
>


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