SKC Silver Membrane Filters

SKC silver membrane filters are manufactured entirely of pure metallic silver in a controlled environment. The many desirable properties of silver membranes make them suitable for a wide range of applications.

The orientation of a silver membrane filter is important. Each side of the silver membrane filter is different. One side appears shinier than the other side does. Use the shinier side for scanning electron microscopy (SEM) and the duller of the two sides for all other filtration applications and analytical work, including X-ray diffraction.

Chemical resistant to the following categories of chemicals: Alcohols Fuels Hydrocarbons Natural and synthetic oils Alkalis Cryogenics Photoresists Ether Propellants Oxidizers Halogenated hydrocarbons Esters Most organics and acids

SKC Silver Membrane Filters Silver Membrane Filters Product Data Bulletin (PDF)

• Absolute retention and no media migration
  
  
• Strong with minimal fluid retention
  
  
• Completely inert
  
  
• Economical, can be cleaned and reused in most instances
  
  
• Conductive
  
  
• Thermal stability over wide temperature range
  
  
• NIOSH specified for bromine and chlorine, Method 6011
  
  
• Smooth surface provides high surface capture
  
  
• Autoclavable
  
  
• Uniform porosity and thickness

---

Performance Profile:

Membrane material:	99.97% pure metallic silver
Characteristics:	Conductive, excellent chemical resistance, inert, reusable
Pore sizes available:	0.2, 0.45, 0.8, 1.2, 3.0, and 5.0 µm (0.45 and 0.8 µm currently available as stock items from SKC)
Diameters available:	13, 25, 37, and 47 mm (25 mm / 0.45 µm and 37 mm / 0.8 µm currently available as stock items from SKC)
Thickness:	0.002 inch/50 µm
Operational temperature range:	Cryogenic to 1022 F (550 C)
Retention:	Absolute from 0.2 µm to 5 µm
Cleaning:	Clean immediately after each use; handle carefully to avoid punctures or tears.
• Ignition cleaning:	Heat in laboratory muffle furnace for approximately 30 minutes
• Chemical cleaning:	Immerse in strong alkaline solution, solvent, or acid (except nitric acid, sulfuric acid, or cyanide solution)
• Combination   cleaning:	Combine chemical and ignition cleaning.
• Ultrasonic cleaning:	Use low-intensity ultrasonics.
• Plasma etching/    cleaning:	Use oxygen plasma etcher/asher.
Shelf-life:
• Unopened:	Indefinite
• Opened packages:	Silver membranes can tarnish if exposed to chemicals in the air. This is cosmetic and will not affect filtration properties. For long-term storage after opening, an inexpensive vacuum desiccator cabinet is recommended.

---

Silver Membrane Filter Applications

• Collection and analysis of coke oven emissions
  
• Collection and analysis of polyaromatic hydrocarbons
  
• Analysis of airborne silica
  
• Collection and analysis of airborne asbestos fibers by X-ray diffraction
  
• Collection and analysis of carbon and carbon black
  
• Collection and analysis of fly ash directly from smoke stacks
  
• Analysis of biological specimens by scanning electron microscopy, especially when being collected from suspension
  
• Dimensional preservation of specimens during freeze-drying
  
• Filtration of alcoholic beverages
  
• High temperature processing of viscous materials
  
• Performing mild chemical digestion directly at filter surface
  
• High temperature stack sampling
  
• High temperature sterilization procedures
  
• Filtration involving organic solvents
  

---

Silver Membrane Filters

Ordering Information        

Diameter (mm)	Pore Size (µm)	Support Pad Incl.	Cat. No.	Pkg. Size
25	0.45	No	225-1802	50
25	0.8	No	225-1803	50
37	0.8	No	225-1801	25
47	0.8	No	225-1804	25

Also available as a custom order in diameters of 13 mm, 25 mm, 37 mm, and 47 mm with pore sizes of 0.2 µm, 0.45 µm, 0.8 µm, 1.2 µm, 3.0 µm, or 5.0 µm. Contact SKC Sales for more information.

Silver Membrane Filters Product Data Bulletin (PDF)

Filter/Cassette Solvent Compatibility Chart (HTML)

Filter/Cassette Solvent Compatibility Chart (PDF)

 

---

Preloaded Coated Silver Membrane Filters

Ordering Information      

Description	Cat. No.	Pkg. Size
Teflon® pre-filter & porous plastic support specially cleaned silver membrane & porous plastic support loaded into 3-piece 25 mm cassette for sampling bromine or chlorine using NIOSH Method 6011	225-9006	5

Silver Membrane Filters Product Data Bulletin (PDF)

Filter/Cassette Solvent Compatibility Chart (HTML)

Filter/Cassette Solvent Compatibility Chart (PDF)

---

A typical filter will have a rough side and a shiny side. The shiny side is easier to read under a microscope, therefore, expose the shiny side to the air for microscopic analysis. The rough side holds dust more effectively; expose the rough side for gravimetric analysis.

Filter FAQs

---

Custom Filters Available
For specific applications, SKC will manufacture filters to meet your specific requirements. Download the Custom Filter Order Form in PDF format. Complete the form and fax it to your SKC representative or contact your SKC representative or call the SKC Sales Department at 724-941-9701 for more information.

Custom Filters Order Forms (PDF Format)

---

This page was last modified August 1, 2005