The attached files display the results of the most recent DME ageing
tests.  Brief descriptions and comments on each test follow:

E29 REF - reference chamber (no ageing)

E30 PRH (TEF) - Pure DME (no deliberate contaminants), hi-rate to
Q=0.666 C/cm.  After that a corregated Teflon tube was inserted in gas
stream.  No significant damage in either case.

E31 PLG - Plug Valve (a type of valve considered for gas system)
inserted in gas stream.  Obvious extreme damage ... this type of valve
was not used in gas system.

E32 BLV - Ball Valve inserted in gas stream.  This type of valve is used
in gas system.  Some minor ( <10%) damage after ~ 0.4 C/cm (probably ~5
times more charge than expected over life of experiment).

E33 LDP (NEO) - low density polyethylene straw (as used in chambers) in
gas stream to 0.276 C/cm.  After that straw removed and replaced with
corregated neoprene tube.  No significant damage in either case.

E34 LTX (LTT) - latex compound (as used in chambers) in gas stream to
0.288 C/cm.  After that replaced with latex tube.  No significant damage
in either case.

E35 RTV - RTV silicone rubber in gas stream.  Used to compare with E36
below.  Extreme damage evident.

E36 RTF - gas stream was split after passing over the RTV of E35, one
stream continued thru E35, other stream passed thru R3-11/sieve filter
then thru E36.  Minor damage (<10%) evident after ~ 0.229 C/cm.  Filter
appears to trap "damaging" component of RTV outgassing.

E37 PRL - "pure" DME (no deliberate contaminants) low-rate. No
significant damage until >0.05 C/cm.  Then fairly rapid damage between
0.05< Q<0.11 C/cm.  No further damage 0.11
Filename: e37_40.ps

Filename: E33_36.ps

Filename: e29_32.ps


 Ageing Tests Update / Robert Openshaw  


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