Handy Septum Size Chart

Handy Septum Size Chart

Instrument    Septum Diameter      Instrument    Septum Diameter
Agilent Pye/Unicam
5880A, 5890, 6850,
6890, 7890, PTV
11 mm All Models 7 mm
5700, 5880 9.5/10 mm Shimadzu
On-Column Injection 5 mm All Models Plug
(Injector Type)
Packed Column 9.5/10 mm GCs With Heated Inlets 9.5 mm
1078/1079 10/11 mm All Other Models Plug
1177 9 mm Thermo Scientific
1075/1077 11 mm TRACE 1300 and 1310 Series 11 mm
Finnigan (TMQ) TRACE Ultra GC 17 mm
GC 9001 9.5 mm FOCUS GC 17 mm
GCQ 9.5 mm GCQ w/TRACE, PTV 12.7 mm
QCQ 9.5 mm 8000 Series 17 mm
TRACE 2000 9.5 mm Tracor
Gow-Mac 540 11.5 mm
6890 Series 11 mm 550, 560 9.5 mm
All Other Models 9.5 mm 220, 222 12.7 mm
Sigma Series 11 mm
900, 990 11 mm
8000 Series 11 mm
Auto SYS, Auto SYS XL 11 mm

Restek septa are packaged in ultra-clean blister packs.
*12.7 mm and 17 mm BTO septa packaged in precleaned glass jars.

Tips for Handling Septa

All septa, regardless of composition, puncturability, or resistance to thermal degradation will fail if they are mishandled. Overtightening a septum nut invariably will reduce septum lifetime by increasing coring/splitting. All septa contain volatile materials (e.g., phthalates) that are released when the septum is heated (septum bleed). Because most GCs are equipped with a septum purge, septum bleed generally will disappear within 30 minutes after installing a new septum and exposing it to normal injector temperatures. All Restek septa are preconditioned and are ready to use without delay—order your Restek septa today at