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SpectraPor® Tubing Closures

Available in three functional types, SpectraPor® Tubing Closures are intended for use with Regenerated Cellulose (RC) dialysis tubing to ensure a leak-proof seal. These closures are not recommended for use with Cellulose Ester (CE).

SpectraPor® Tubing Closures

SpectraPor® Closures are designed with tight-gripping seal ridges that provide a reliable leak-proof seal for thin-walled and more flexible dialysis tubing. These closures should be used only with RC and low MWCO (=< 20 kD) CE dialysis tubing.  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 to ensure a proper seal.

Made from polypropylene (PP) material, the compatibility of SpectraPor® Closures with specific solvents should be confirmed on the Repligen Chemical Compatibility table.

SpectraPor® Closures are available in three functional types for improved dialysis efficiency: Standard, Weighted and Magnetic.

Standard type closure

SpectraPor® Standard Closures float and aid in sample buoyancy when applied to the top-end of the dialysis tubing; 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
Quantity: 10/pkg
Material: Polypropylene
Temperature: 0 - 121°C (autoclavable)

Weighted Type Closure

SpectraPor® Weighted Closures have an encased stainless-steel bar for additional weight. When applied to the end of the dialysis tubing, the end turns downward to ensure a vertical orientation while providing a leak-proof seal.

Product Specifications
Functional Benefit: Weighted for vertical sample orientation
Membrane Types: Standard RC, Biotech RC & low MWCO Biotech CE (=< 20 kD),   Not recommended for use with high MWCO Biotech CE (> 20 kD)
6 Sealing Widths: 12, 23, 35, 55, 75 & 90  mm
1 Color: White
Quantity: 10/pkg
Material: Polypropylene
Temperature: 0 - 121 °C (autoclavable)

Paired (Standard and Weighted) Closures

SpectraPor® Paired Closures combines 10 standard and 10 weighted closures for dialysis convenience. Optimal sample buoyancy and vertical orientation can be achieved by applying both a Standard and a Weighted closure to opposite ends of the same dialysis tubing.  

Product Specifications
Functional Benefit: Buoyancy and vertical orientation
Membrane Types: Standard RC, Biotech RC & low MWCO Biotech CE (=< 20 kD),   Not recommended for use with high MWCO Biotech CE (> 20 kD)
6 Sealing Widths: 12, 23, 35, 55, 75 & 90  mm
2 Colors: Orange (standard) and White (weighted)
Quantity: 10 standard & weighted pairs/pkg
Material: Polypropylene
Temperature: 0 - 121 °C (autoclavable)

Magnetic Type Closure

SpectraPor® 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 sample submersion and rotation on a stir plate.

Product Specifications
Functional Benefit: Vertical orientation and rotation
Membrane Types: Standard RC, Biotech RC & low MWCO Biotech CE (=< 20 kD),   Not recommended for use with high MWCO Biotech CE (> 20 kD)
4 Sealing Widths: 23 mm, 35 mm, 55 mm, 75 mm
1 Color: Red
Quantity: 2/pkg
Material: Polypropylene (PP), fluorocarbon-coated magnetic SS bar
Temperature: 0 - 121 °C (autoclavable)

Part Numbers

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Closure Type

Color

Sealing Width

Qty

12 mm

23 mm

35 mm

55 mm

75 mm

90 mm

Standard

Orange
White
Green
Blue

132734
-
-
-

132735
-
-
-

132736
142736
142837
142936

132737
142737
142837
142937

132738
142738
142838
142938

132739
142739
142839
142939

10/pkg

Weighted

White

132742

132743

132744

132745

132746

132747

10/pkg

Paired

Orange/White

132749

132750

132751

132752

132753

132748

10 pairs

Magnetic

Red

-

132760

132762

132764

132766

-

2/pkg

 

Resources

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Frequently Asked Questions | Dialysis