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www.restekcorp.com800-356-1688
by Gary Barone, GC Accessories Product Marketing Manager
InfraRed
™
Septa
New! High-Performance, Low Bleed
✔
Incredible high-quality.
✔
Stable to 325°C.
✔
Low bleed.
✔
Excellent puncturability.
✔
Do not adhere to injectors.
Restek introduces the new InfraRed
™
septa. These
septa are formulated with silicone and filler that
maximize thermal stability to 325°C, and provide
smooth puncturability and very low bleed.
Experience low bleed and long lifetimes using these
new InfraRed
™
septa.
InfraRed Septa
Septum Diameter
25-pk.
50-pk.
100-pk.
9mm
9.5mm (3/8")
10mm
11mm (7/16")
11.5mm
12.5mm (1/2")
17mm
Shimadzu Plug
Instrument
Septum Size
Agilent (HP)
5880A, 5890, 6890,6850 11mm
5700, 5880
9.5/10mm
On-Column Injection
5mm
CE Instruments (TMQ)
TRACE GC
17mm
Finnigan (TMQ)
GC 9001
9.5mm
GCQ
9.5mm
GCQ w/TRACE
17mm
QCQ
™
9.5mm
TRACE 2000
9.5mm
Fisons/Carlo Erba (TMQ)
8000 series
17mm
Gow-Mac
6890 series
11mm
All other models
9.5mm
Perkin-Elmer
Sigma series
11mm
900,990
11mm
8000 series
11mm
Auto SYS
11mm
Pye/Unicam
All models
7mm
Shimadzu
All models
Plug
SRI
All models
Plug
Tracor
540
11.5mm
550,560
9.5mm
220,222
12.5mm
Varian
Injector type:
Packed column
9.5/10mm
Split/splitless 1078/1079 10/11mm
1177
9mm
Septum Diameter
25-pk.
50-pk.
100-pk.
5mm (
3
/
16
")
6mm (
1
/
4
")
7mm
8mm
9mm
9.5mm (
3
/
8
")
10mm
11mm (
7
/
16
")
11.5mm
12.5mm (
1
/
2
")
17mm
Shimadzu Plug
Thermolite
®
Septa
✔
Usable to 340°C inlet temperatures.
✔
Each batch tested on FIDs, ECDs, & MSDs to ensure low bleed.
✔
Excellent puncturability.
✔
Preconditioned and ready to use.
✔
Packaged in non-contaminating glass jars.
IceBlue
™
Septa
✔
General purpose septa.
✔
Excellent puncturability.
✔
Preconditioned and ready to use.
✔
Do not adhere to hot metal surfaces.
✔
Usable to 250°C inlet temperatures.
✔
Ideal for SPME.
Septum Diameter
50-pk.
100-pk.
9mm
9.5mm (
3
/
8
"
)
10mm
11mm (
7
/
16
"
)
11.5mm
12.5mm (
1
/
2
"
)
17mm
Shimadzu plug
Septum Size Chart
handy
Septum bleed occurs when volatile compounds are off-gassed from the septum. During a temperature-pro-
grammed analysis, you can see septum bleed in baseline rise and/or extraneous peaks not associated with the
sample or the column. Septum bleed is most noticeable during temperature-programmed analyses because the
volatiles off-gassed from the septum collect on the head of the analytical column during the cool-down period and
initial hold time. Then, these volatiles elute during subsequent runs. Under isothermal conditions, septum bleed is
a continuous, steady interference that appears as part of the normal background noise. Either way, septum bleed
interferes with quantitation and analysis accuracy. Septum bleed can be affected by inlet temperature, initial hold
time, compression, injection mode, etc.; but, the single most important variable is the septum quality. To maintain
analytical integrity, use high-quality septa for senstitive or high-temperature analyses.
What is
Septum
Bleed?
Hot Tech Tip
5
7
9
9.5
10
11
11.5
12.5
17
Measure
your old
septum
here
(size in
mm)
21419
21418
21417
21426
21425
21424
21432
21431
21430
21438
21437
21436
21421
21422
21423
21429
21428
21427
21433
21434
21435
21441
21440
21439
22381
22382
22388
22389
22390
22391
22392
22393
22383
22384
22394
22395
22396
22397
22398
22399
20351
20352
20353
20355
20356
20357
20381
20382
20383
20370
20371
—
20354
20358
20362
20359
20360
20361
20379
20378
20380
20363
20365
20364
22385
22387
22386
20367
20368
20369
20384
20386
20374
20385
20372
20373