Edition: U.S.
Spectrum Labs, the leader in filtration and laboratory dialysis.
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Selection Guide for Spectrum Dialysis Membranes

Selecting "the Right Membrane"

The key to a successful dialysis separation is using the RIGHT MEMBRANE under the right conditions. There are 6 steps to follow when selecting a membrane:

  1. Select grade (Biotech or Standard) based on application.
  2. Select type based on chemistry: CE or RC.
  3. Select membrane configuration based on application (tubing, disposable device or flat-sheet system).
  4. Select from among 18 MWCO's based on solute size.
  5. Select from among 5 sizes (disposable device) or from among 16 flat widths (tubing) based on volume.
  6. Select the membrane treatment preferred for your application.

Use Spectrum's Dialysis Parameter Search to help select a product:

Spectra/Por Biotech Grade Membranes

Biotech membranes are specifically engineered for more critical separation constraints in which an ultrapure membrane with a precise MWCO is required. Since these synthetic membranes are manufactured using a process without metal salts, no pre-treatment or cleaning is required. Biotech membranes are available in 2 membrane types:
Biotech Cellulose Ester (CE) wide range of selectivity & purity
Biotech Regenerated Cellulose (RC)combined selectivity, purity & resistance
For ultimate convenience and ease-of-use, Spectrum offers:
Biotech Ready-to-Use Dialysis Devicessmall volumes, in-process sampling & rapid dialysis

Spectra/Por Standard Grade Membranes

Ideal for basic, multi-purpose dialysis, this low cost membrane can be used for a wide variety of dialysis applications in which only general separations are required and low level membrane impurities are of little concern. The standard RC type is composed of natural cellulose regenerated from cotton linters for strength and durability.
Standard Regenerated Cellulose (RC)broad range, low cost lab applications

Membrane Grade:Biotech Standard
Membrane Type:CERC RC
MWCO (Daltons):100-500, 500-1000, 3.5-5K,
8-10K, 20K, 50K, 100K,
300K, 1000K
3.5k, 8k, 10k, 15k, 25k 1k, 2k, 3.5k, 5k,
6-8k, 10k, 12-14k,
15k, 25k, 50k
Physical Properties:Opaque, Rigid, Mildly HydrophobicOpaque, Flexible, Hydrophilic Clear Flexible, Hydrophilic
Organic Resistance:FairGoodGood
pH Range:2 - 92 - 122 - 12
Temperature Limit:37°C60°C121°C
Flat Sheet:NONOYES
Universal Only Universal Only Universal or Spectra/Por®
Dialysis Devices:
Float-A-Lyzer G2
NO Dialysis Sacks
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Findamentals of Dialysis
Frequently Asked Questions (FAQs)
Ready-to-Use Dialysis Comparison
Chemical Compatibility
Pore Size Chart
Application Notes
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