Waters, 186003064, XBridge BEH C18 Sentry Guard Cartridge, 130Å, 5 µm, 4.6 mm X 20 mm, 2/pk

As a workhorse for HPLC method development, XBridge BEH C18 sorbent can be used over an entire range of mobile phase pH (1-12). The trifunctionally bonded C18 ligand provides you with a universal column for most HPLC separations and gives you the widest usable pH range, superior low pH stability, and ultra-low column bleed.

Specifications
Chemistry: C18
Separation Mode: Reversed Phase
Particle Substrate: Hybrid
pH Range Min: 1 pH
pH Range Max: 12 pH
Maximum Pressure: 6000 psi (415 Bar)
Endcapped: Yes
Silanol Activity: Low
Particle Shape: Spherical
Particle Size: 5 µm
Pore Size: 130 Å
Format: Sentry Guard Cartridge
Surface Area: 185
System: HPLC
Particle Technology: BEH
USP Classification: L1
Inner Diameter: 4.6 mm
Length: 20 mm
Carbon Load: 18 %
UNSPSC: 41115709
Brand: XBridge
Product Type: Guards
Units per Package: 2 pk

FAQ
How Often Should I Replace My Guard Column? It is important to replace guard columns before contaminants have the chance to affect analytical columns. For best results, it is recommended to choose a regular interval at which columns are replaced. This may be weekly, after running 50-100 samples, or after completion of a set of analyses.
If the quality of separations deteriorates or the initial back-pressure increases more than 20%, this is an indication that the guard column needs to be replaced. If contaminants are apparent in a chromatogram, replace the guard column immediately and follow the manufacturer’s recommendations for cleaning the column.
When replacing, be sure to equilibrate the analytical column and guard column and to check for leaks.