VICI M Series - Manual (Page 22)

18
Chemical Compatibility of Wetted Surfaces
To ensure best results, please consider the chemical
compatibility of the wetted surfaces with the liquids to
be used before putting the pump into service.
Model M6
PTFE
The piston tips are made from PTFE. Polytetrafluoroethylene is the generic
name for the class of materials such as Teflon
® . It offers superior chemical
resistance and lends itself to good sealing characteristics. Because it’s so
easy to handle, it is often used in low pressure situations such as the M6
pump. Compounds of low molecular weight can permeate PTFE.
PAEK
The pump port end cap is made of a PAEK-based composite.
Polyaryletherketone is the generic name for the family of polyketone com-
pounds. PAEK includes PEK, PEEK, PEKK, and PEKEKK, which differ in
physical properties and, to a lesser degree, in inertness. This composite
used in the M6 resists all common HPLC solvents and dilute acids and
bases. However, concentrated or prolonged use of halogenated solvents
may cause the polymer to swell. Avoid concentrated sulfuric or nitric acids
(over 10%) and refer to the guidelines on the next page.
Valcon P
The M6 pump rotor is made from Valcon P. This PTFE/carbon composite is
employed as a rotor material in many Valco valves, so it has seen extensive
use in many analytical applications. It is routinely used at 1000 psi/75°C,
and can also be used at temperatures approaching 200°C with decreased
sealing tension.
Sapphire
The M6 piston chambers are made of sapphire and are sealed in place
with a Viton
® O-ring. Sapphire has a unique set of properties including high
strength, hardness, surface smoothness, and excellent chemical compatibil-
ity. It is commonly used in applications where a combination of exceptional
mechanical and chemical properties is essential.
Viton ®
Viton ® O-rings are used to seal the sapphire pistons. Besides its excellent
mechanical properties, Viton ® provides the best proven fluid and chemical
resistance of any commercial non-fluorinated elastomer. NOTE: Viton ® is
not compatible with THF and acetone. Use of these substances will cause
premature O-ring failure, which can lead to additional pump damage.
Teflon ® is a registered trademark of E.I. duPont de Nemours .
Viton ® is a registered trademark of DuPont Dow Elastomers.