Pall Gelman provides two types of mixed cellulose esters membranes for environmental monitoring: the GN-4 Metricel® and the GN-6 Metricel®.
GN-4 Metricel 0.8µm membranes are well suited for metal and asbestos level monitoring. They meet all NIOSH requirements for performing Methods 7400 and 7402. Available in 25, 37, and 47mm diameter, with or without support pads. Provided nonsterile; autoclave or EtO if desired.
GN-6 Metricel 0.45µm membranes are suitable for use in US EPA Method 1310 EP Toxicity Testing and meet the requirements for other hazardous waste filtration methods referenced in US EPA SW-846. These membranes meet the US EPA AHERA regulations and NIOSH and OSHA methods of airborne asbestos monitoring. They can also be used in microbiological water testing and analysis in accordance with standard membrane filtration techniques. They meet or surpass all US EPA and ASTM specifications for microbiological analysis.
GN-6 Metricel membranes are available in diameters of 13, 25, 37, 47, and 142mm, nonsterile; autoclave if desired. 47mm GN-6 membranes can be purchased in individually packaged sterile "S-Packs" or in an "Autoclave Package" - 100 membranes and absorbent pads grouped into packets ready for autoclaving.
- For air monitoring, Cat.Nos. 629-64677, 629-66263, and 629-63068 are available in Pall Gelman 25mm Air Monitoring Cassettes.
- Cat.Nos. 629-64678 and 629-64382 are available in Pall Gelman 37mm Air Monitoring Cassettes.
Specifications for Metricel Membranes:
|GN-4 Metricel||GN-6 Metricel|
|Typical filter weight||4mg/cm2||4mg/cm2|
|Typical water flow rate (at 10 psi)||145mL/min/cm2||65mL/min/cm2|
|Typical air flow rate (at 10 psi)||15Lpm/cm2||8Lpm/cm2|
|Max. operating temp-water||74°C||74°C|
|Min. bubble point-water||1.0kg/cm2, 14 psi||1.8kg/cm2, 26 psi|
|Typical moisture pickup (after 24 hr at 48% RH/23°C)||<1%||<1%|