Thermo Scientific™ Nalgene™ Membrane and Prefilter Disks

Catalog No.	Diameter (Metric)	Material	Pore Size	Color
09-740-23	50 mm	Glass Fiber	-	-
09-740-13	47 mm	Cellulose Acetate	0.2 μm	White
09-740-14	47 mm	Cellulose Acetate	0.45 μm	White
09-740-21	47 mm	Cellulose Nitrate	0.45 μm	White
09-740-22C	90 mm	Glass Fiber	-	-
09-740-24	75 mm	Glass Fiber	-	-
09-740-5B	47 mm	Nylon	0.2 μm	White
09-740-5C	47 mm	Nylon	0.45 μm	White
09-740-22	47 mm	Cellulose Nitrate	0.45 μm	Gray

Catalog No. 09-740-23 Supplier Thermo Scientific™ Supplier No. DS02815000

Description

Carry out particulate and microbial analysis with these filter membranes. Available in various forms for water quality work, cold sterilization or sample clean up.

Rely on Thermo Scientific™ Nalgene™ Membrane and Prefilter Disks to meet a wide range of laboratory filtration needs. Used in conjunction with either single use or reusable hardware and filter holders, filter disks offer you flexibility and choice to fit many applications. Sterile filter disks are available in materials ranging from nylon, cellulose nitrate, cellulose acetate and glass fiber membranes.

• Sterile membrane disks are optimized for microbial QA/QC testing and feature the highest recovery rates
• White and black membranes for easy visibility of colonies
• Gridded membranes are printed with non-toxic ink for easy enumeration of colonies

Certifications

Meets EPA and APHA standards for water quality work

Specifications

• Filter Type: Prefilter
• Material: Glass Fiber
• Sterility: Non-sterile
• No. per Case: 100
• No. per Pack: 100
• Diameter (Metric): 50 mm

Frequently Asked Questions (FAQs)

How do I use Thermo Scientific Nalgene glass fiber prefilters?

Glass fiber prefilters are available as an optional accessory (DS0281 series) and bundled with select Thermo Scientific Nalgene Rapid-Flow filter units. They are useful in filtration of solutions with an especially high particulate load, often enabling a higher volume to be filtered before significant flow decay by trapping and preventing the larger particulate matter from entering the final filter membrane. Simply place one prefilter on top of the membrane bonded inside the unit, wet slightly to hold in place, and proceed with filtration as usual.

What is the effective pore size of Thermo Scientific Nalgene glass fiber prefilters?

Our glass fiber prefilters have an effective pore size of 1.0 to 1.3 microns.