What are the differences between the Lachat PVC and Duraperene™/Santoprene pump tubes?


Dokument-ID TE12160


Veröffentlichungsdatum 18.12.2019
What are the differences between the Lachat PVC and Duraperene™/Santoprene pump tubes?
Description of why one would use a PVC or Duraprene™/Santoprene pump tubing with their Lachat instrument.
The Lachat Quikchem® instruments are compatible with both PVC and Duraprene™/Santoprene pump tubings (See also: What is the part number for the Lachat pump tubing?)) Which one is recommended (or in some cases required) depends on which method is being performed.

The PVC pump tubes are required for high back pressure methods.  If the method requires PVC pump tubing the statement “Must use PVC pump tubes” will appear in the manifold diagram notes of the Lachat Quikchem® method.

For methods that do not specify this, the manifold will be shipped with the Duraprene™/Santoprene pump tubes.  These are more elastic and as a result they last longer than the PCV pump tubes.  As a result these do not flatten out as quickly but also do not handle back pressure well.

When replacing pump tubes for a method that does not specify which material of pump tube to use it is recommended that the Duraperene™/Santoprene tubes be used so that they do not need to be changed as frequently.  If one does switch to PVC pump tubes make sure to change the carrier line and all reagent lines for that specific manifold.  For a specific manifold you do not want to mix and match the PVC and Duraprene™/Santoprene since the flows merge together but the materials do not handle back pressure in the same way. This could lead to some subtle flow problems.
One exception to this is the Lachat phenol methods where we avoid PVC for chemistry reasons (See also: Can PVC pump tubing be used for Lachat Phenol methods? ).

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