Dimensions
cat.#
qty.
10 x 2.1mm
917850212
3
10 x 4.0mm
917850210
3
20 x 4.0mm
917850220
2
Column
2.1mm ID
3.2mm ID
4.6mm ID
Length
cat.#
cat.#
cat.#
30mm
9178532-700
9178533-700
9178535-700
50mm
9178552-700
9178553-700
9178555-700
100mm
9178512-700
9178513-700
9178515-700
150mm
9178562-700
9178563-700
9178565-700
200mm
9178522-700
9178523-700
9178525-700
250mm
9178572-700
9178573-700
9178575-700
Column
1.0mm ID 2.1mm ID 3.2mm ID 4.6mm ID
Length
cat.#
cat.#
cat.#
cat.#
30mm
9178531
9178532
9178533
9178535
50mm
9178551
9178552
9178553
9178555
100mm
9178511
9178512
9178513
9178515
150mm
9178561
9178562
9178563
9178565
200mm
9178521
9178522
9178523
9178525
250mm
9178571
9178572
9178573
9178575
Restek (U.S.):
110 Benner Circle
Bellefonte, PA 16823
800-356-1688
• 814-353-1300
fax: 814-353-1309
Restek France:
01-60-78-32-10
fax: 01 6078 70 90
Restek GmbH:
(49) 06172-2797-0
fax: (49) 06172-2797-77
Thames Restek U.K., Ltd.:
01753-624111
fax: 01753-624666
© Copyright 2002, RestekCorporation
Lit. Cat. # 59371
At-a-Glance
Product
Information
fromRestek
Restek trademarks: Trident,
and the Restek logo.
Ultra Aqueous C18
Restek is your free
technical literature source!
ApplicationNotes:
(#59177) Analyze Polar Compounds by
Reversed Phase HPLCUsingUltra Aqueous
C18 Column
(#59314) Trident
™
Direct Guard Cartridge
System Fast Facts
Commonly Asked Questions
• How is theUltraAqueousC18 columndifferent from traditionalC18 columns?
TheUltraAqueousC18 columnhas a trueC18 alkyl linkage to ahigh-surface-area
TypeB silica support. This is different from traditionalC18phases becauseRestek
uses anovel bondingprocess that results in apolar group attached to the silica
surface. It is this secondaryprocesswith thepolar functional groups thatmakes the
UltraAqueousC18 columnunique and allows it tobeused inhighly aqueousmobile
phases.
• How isRestek’sUltraAqueousC18 columndifferent fromother brands of
highlyaqueous stationaryphases?
There are several approaches todesigning aqueous stationaryphases. Someof the
older types of highly aqueous stationaryphases used a low-densitybondingof the
C18 ligand, unintentionally leaving exposed silanol sites. These silanol sites helped
to create ahydrophilic surface that kept the alkyl chains suspended.However, the
very reactive silanol sites could cause severepeak tailingof basic analytes.Another
avenuemanufacturers have taken is to cross-link theC18 chains, creating aphysical
hindrance thatwouldprevent the alkyl chains from collapse. This process has been
successful, but creates problems in trying toperform a secondary end-cappingproce-
dure, somany reactive silanol sitesmay remain. TheRestekprocess successfully
achieves secondarypolar end-capping that provides ahydrophilic environment that
prevents thehydrophobic alkyl chain from folding.
• What are theparticleandpore sizes of the silicaused for theUltraAqueousC18
column?
TheUltraAqueousC18 is available in3µmor 5µm spherical, TypeB silicawith a
100Åpore size.
• What are the temperatureandpH ranges of theUltraAqueousC18 column?
Temp. limits:Up to80°C pH limits: 2.5 -7.5
• Areguard cartridges available for theUltraAqueousC18 column?
Yes. TheUltraAqueousC18 column is available as part of theRestek
Integral
Trident™guard system
,which is oneof themost efficient guard systems on the
market.Or it is available as part of our
Trident
™
Direct guard system
, Restek's effi-
cient, universal guard cartridge andholder system.
UltraAqueous C18 5µmColumns
UltraAqueous C18 5µmColumns withTrident
™
Inlet Fitting
UltraAqueous C18GuardCartridges
•
Call
814-353-1300 or
800-356-1688, ext. 5
•
Fax
814-353-1309
•
Online
Also available in 3µm.
Call for details.
