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Filters & Frits
PEEK
™
Frits
Inert, biocompatible and metal-free
Uniform porosity, longer fltration life
Sealing rings manufactured from PCTFE
Patented Upchurch Scientifc
®
PEEK Frits offer exceptionally uniform
porosity. This property ensures longer fltration life and consistent
frit-to-frit swept volumes. The PEEKpolymer frit discs are biocompatible
and inert to most solvents, making them well-suited for bioanalytical
applications. PEEK’s robust properties make these products suitable
for low and high pressure applications.
Disc rings, included on most PEEK frits, are made of PCTFE and are
slightly thicker than the frit disc, providing enhanced sealing and
excellent chemical resistance. PCTFE surrounded PEEK frits can
be used up to 80 ºC, and PEEK frits alone are a good choice for
applications up to 100 ºC.
Frit Volume
The term “frit volume” refers to the volume of the various fuid pathways
that comprise the matrix of a frit. A standard frit is a mass of small particles
fused together through a controlled process of compression and heat.
Because of their shape, there are gaps between the fused particles. Fluid
makes its way through these gaps, creating a pathway from one side of the
frit to the other. (See the diagram, below, where the white circles represent
frit particles, and the black area represents the void between the particles.)
Generally, when the frit particles increase in size, the frit’s porosity increases
as well. The larger the particles, the larger the gaps between particles.
Cumulatively, these gaps comprise what is known as “frit volume”. Using
gravimetric determination, it has been experimentally shown that the total
volume of any given frit may range from 18%–30%, depending upon the
porosity of the frit.
Frit volume is calculated by determining what the mass of the frit would be
if it were a solid block of material of equal size. Then the solid mass of the
frit is multiplied by the percentage assigned to the porosity to determine
the theoretical frit volume.
18% for 0.2 µm frits
20% for 0.5 µm frits
24% for 2 µm frits
26% for 5 µm frits
28% for 10 µm frits
30% for 20 µm frits
From a chromatographic perspective, it’s important to know the volume of
the frit used in your system. It is possible for a frit to negatively impact your
chromatography if the total frit volume is too large and if it is placed in an
area through which the sample will pass. To avoid frit-related problems like
band broadening and loss of resolution, most inline flters placed after the
sample introduction point (e.g., between the injection valve and the column)
are smaller in size and porosity than inline flters that are placed in areas
before the sample is introduced into the fow path (e.g., between the pump
and the injection valve).
Frits
Order Online
www. idex-hs .com
Application Note
2 µm Semi-Prep PEEK Frits
0.750”
(1.91 cm)
0.620” (1.57 cm)
diameter
0.070” (0.18 cm)
thick
A-346
0.070”
(0.18 cm)
OC-802
0.560”
(1.42 cm)
0.460” (1.17 cm)
diameter
0.070” (0.18 cm)
thick
A-712-02
0.740”
(1.88 cm)
2 µm PEEK Frits
A-704
0.125” (0.32 cm)
diameter
0.062” (0.16 cm)
thick
0.091” (0.23 cm)
diameter
0.062” (0.16 cm)
thick
A-702
0.250”
(0.64 cm)
0.250”
(0.64 cm)
0.250”
(0.64 cm)
0.062” (0.16 cm)
diameter
0.062” (0.16 cm)
thick
A-700
A-710
0.200”
(0.51 cm)
0.200”
(0.51 cm)
0.125” (0.32 cm)
diameter
0.062” (0.16 cm)
thick
A-708
0.062” (0.16 cm)
diameter
0.062” (0.16 cm)
thick
A-706
0.188” (0.48 cm)
diameter
0.062” (0.16 cm)
thick
0.5 µm PEEK Frits
A-705
0.125” (0.32 cm)
diameter
0.062” (0.16 cm)
thick
A-701
0.250”
(0.64 cm)
0.200”
(0.51 cm)
0.200”
(0.51 cm)
0.062” (0.16 cm)
diameter
0.062” (0.16 cm)
thick
0.092” (0.23 cm)
diameter
0.062” (0.16 cm)
thick
A-703
A-711
0.125” (0.32 cm)
diameter
0.062” (0.16 cm)
thick
0.195” (0.5 cm)
diameter
0.062” (0.16 cm)
thick
A-707
0.062” (0.16 cm)
diameter
0.062” (0.16 cm)
thick
A-709
0.062”
(0.16 cm)
0.740”
(1.88 cm)
A-713-02
A-735
0.192”
(0.49 cm)
0.045” (0.11 cm)
diameter
0.031” (0.08 cm)
thick
0.250”
(0.64 cm)
0.250”
(0.64 cm)
0.250”
(0.64 cm)
0.250”
(0.64 cm)
FOR ORDERING & DISTRIBUTOR INFORMATION +1 800 426 0191 • +1 360 679 2528 • www.idex-hs.com