Using resealable closures is the preferred method for sealing dialysis
tubing without the risk of leaking. Tied knots are nearly impossible to open &
re-seal and often result in damaged, leaking membranes. Spectrum offers two classes of
Dialysis Tubing Closures, Universal Closures for use with all membrane types and specialized
with additional functional benefits for use only with Standard Grade tubing.
Spectra/Por Closures for Standard RC Membrane Only
Spectrum offers 3 different functional closure types (Standard, Weighted & Magnetic Weighted) as well as a
functional combination pair of closures (Standard & Weighted).
For best results, select a pair of closures that has a sealing width 4 to 10 mm longer than the flat
width of the dialysis tubing. This assures a proper seal without membrane tearing.
Standard Closure Type
Since Spectra/Por Standard Closures float, they aid in buoyancy and
vertical orientation when applied to the tubing top end. Autoclavable
and available in a variety of colors for easy sample identification.
Autoclavable, Spectra/Por Weighted Closures encase an acid-
washed, fluorocarbon coated, stainless steel bar. When applied to
bottom end of the dialysis tubing, the Weighted Closure acts like an
anchor to maintain a vertical orientation of the sample.
Autoclavable Spectra/Por Magnetic-Weighted Closures contain a
magnetic fluorocarbon coated stainless steel bar, eliminating the need
for conventional stir bars. Applied to the bottom end of the dialysis
tubing, this closure provides complete submersion and gentle rotation
of the sample on a stir plate.
The ultimate sample buoyancy and vertical orientation can be
achieved by applying both a Standard and a Weighted Spectra/Por
Closure to opposite ends of the same dialysis tubing. The Paired Closures