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Glassy carbon tubes and ceramic outers

Glassy carbon tubes and ceramic outers as used in High Temperature furnace IRMS preparation systems

 It has been reported that the highly expensive glassy carbon tubes used in these systems can be subjected to oxygen attack if installed in combination with a used ceramic outer. 

This may also be observed if the ceramic has been temperature cycled frequently.  The effect has been attributed to micro fractures forming in the ceramic caused by aluminium and oxygen atoms of the structure becoming mobile at the elevated temperatures.  
Visually, the tube appears unaffected.
To avoid this, it is recommended to change the (relatively inexpensive) outer ceramic whenever the glassy carbon tube is replaced.
 

OEM

Analyser

Ceramic Part no.

Ceramic Dimensions (mm)

Glassy Carbon Part No.

Glassy Carbon Dimensions (mm)

Thermo

TC/EA

C1101

17 x 13 x 470

C7001

12 x 7 x 356

Thermo

Flash HT

C1105

17 x 13 x 450

C7001

12 x 7 x 356

Hekatech

HT-O

C1103

19 x 15 x 470

C7004

12 x 9 x 400

Eurovector

HT-pyrOH

C1102

17 x 13 x 450

C7004

12 x 9 x 400

Elementar

Pyrocube

C1106

30 x 23 x 387

C7017

18 x 14 x 432

Additional Information available: Glassy Carbon Tube and Ceramic Outers.pdf
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