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Dialysis Tubing Closures

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 Spectra/Por® Closures 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.
Product Specifications
Functional Benefit:Sample buoyancy & vertical orientation
Membrane Types:Standard RC only
6 Sealing Widths:12, 23, 35, 55, 75 & 90  mm
4 Colors:Orange, white, green, blue
Qty:10/pkg
Material:Polypropylene
Temperature:0 - 121°C (autoclavable)

Ordering Information: Standard Closures click on Part No. to add to cart

Color Closure Sealing Width Qty
12 mm 23 mm 35 mm 55 mm 75 mm 90 mm

Orange 132734132735132736132737132738132739 10/pkg
White 142734142735142736142737142738142739
Green 142834142835142836142837142838142839
Blue 142934142935142936142937142938142939
Price ($): €85€95€99€101€103€105

Weighted Closure Type


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.
Product Specifications
Functional Benefit:Weighted for vertical sample orientation
Membrane Types:Standard RC only
6 Sealing Widths:12, 23, 35, 55, 75 & 90  mm
1 Color:White
Qty:10/pkg
Material:Polypropylene
Temperature:0 - 121 °C (autoclavable)

Ordering Information: Weighted Closure click on Part No. to add to cart

ColorClosure Sealing WidthQty
12 mm23 mm35 mm55 mm75 mm90 mm

White13274213274313274413274513274613274710/pkg

Price ($):€97€106€110€112€118€119

Magnetic Closure Type


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.
Product Specifications
Functional Benefit:Weighted & magnetic for submersion & stirring
Membrane Types:Standard RC only
4 Sealing Widths:23, 35, 55, 75 mm
1 Color:Red
Qty:2/pkg
Material:Polypropylene
Temperature:0 - 121 °C (autoclavable)

Ordering Information: Magnetic Closure click on Part No. to add to cart

ColorClosure Sealing WidthQty
12 mm23 mm35 mm55 mm75 mm90 mm

Red-132760132762132764132766-2/pkg

Price ($):
€65€68€71€79

Paired Standard & Weighted Closures


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 are autoclavable.
Product Specifications
Functional Benefit:Buoyancy and vertical orientation
Membrane Types:Standard RC only
6 Sealing Widths:12, 23, 35, 55, 75 & 90  mm
2 Colors:Orange (standard) and White (weighted)
Qty:10 standard & weighted pairs/pkg
Material:Polypropylene
Temperature:0 - 121 °C (autoclavable)

Paired Closure Ordering Information: click on Part No. to add to cart

ColorClosure Sealing WidthQty
12 mm23 mm35 mm55 mm75 mm90 mm

Orange/White13274913275013275113275213275313274810 pairs/pkg

Price ($):€158€174€190€196€204€205

Click on any part number for pricing information or to place an order.

Dialysis Resources:






Application Notes
hi dave
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