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).

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.

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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.

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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.

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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.

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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)