[time-nuts] Making a 10811 better

David C. Partridge david.partridge at perdrix.co.uk
Wed Sep 21 08:57:10 UTC 2011

Howsabout HFC-236fa - very similar properties to R114 but not banned. 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Jim Lux
Sent: 20 September 2011 22:38
To: time-nuts at febo.com
Subject: Re: [time-nuts] Making a 10811 better

On 9/20/11 12:46 PM, J. Forster wrote:
> Likely one of the Freons (TM) or Sulphur Hexafluoride.
> Tektronix used a Freon in their 40 KV High Voltage probes. The Vapor 
> pressure of some of those compounds is low at 70F, but they do have to 
> be sealed.
> Unfortunately, virtually all Freon useage has been banned by the EPA 
> (they are said to be "greenhouse gases") and the stuff in now almost unobtanium.
> -John

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