The table provides information about the piston seals used in the pumps and their solvent compatibility.
Pump | Piston Seals |
---|---|
VC‑pumps except VC‑P21 and VC‑P33 | The pumps are shipped with UHMW-PE piston seals. Using tetrahydrofuran, ketones, or ammonium hydroxide as solvents can damage the seals. In rare cases, a shortened lifetime of reversed-phase (UHMW-PE) piston seals has been observed with high pH, ammonium hydroxide containing mobile phases and prolonged exposure. Under harsh conditions, consider replacing the UHMW-PE piston seals with carbon-fiber filled PTFE piston seals. Consider the following:
|
VC‑P21 and VC‑P33 pumps | The pumps are shipped with carbon-fiber filled PTFE piston seals. Slightly increased abrasion may be observed with these seals, depending on the application. Consider testing the permeability of the static mixer regularly at short intervals. |
VF‑pumps | The pumps are shipped with UHMW-PE piston seals. Using tetrahydrofuran, ketones, or ammonium hydroxide as solvents can damage the seals. In rare cases, a shortened lifetime of reversed-phase (UHMW-PE) piston seals has been observed with high pH, ammonium hydroxide containing mobile phases and prolonged exposure. Under harsh conditions, consider replacing the UHMW-PE piston seals with carbon-fiber filled PTFE piston seals. Consider the following:
|