Camfil leak tests each Megalam Panel and Ducted Ceiling Module HEPA/ULPA filter. Testing is performed in Class 100 (M3.5) clean zones within a Class 10,000 (M5.5) clean room. All testing is conducted by the controlled and documented procedures of Camfil's ISO 9001-2000 certified quality system. To enhance upstream sampling capability, leak-scanning systems are equipped with dilution equipment for measuring high particle concentrations. Probe geometry has been optimized to maximize traverse rate and eliminate undetected leaks while maintaining isokinetic sampling. The entire face of the filter is scanned with overlapping strokes including the media to frame interface. As per customer requirements, Polystyrene Latex Spheres (PSL) and Emery 3004 are Camfil's standard challenge aerosols.
Any leak with a penetration exceeding five (5) times the filter's average rated penetration is repaired with an alcohol-based silicone sealant according to industry standards or customer specifications. Polyurethane and other repair materials are available
As in scanning test, leaks are located with the aid of heterogeneous, highly concentrated oil mist. The filter is placed horizontally and the oil mist is allowed to filter gently through the filter. With a dark background and suitable lighting leakage can be confirmed purely visualy. Wisps of smoke passing the filter through holes in the filter are clearly visible.
After gaining approval, each filter receives an inspection label stating its serial number, efficiency for MPPS particles as well as pressure drop at the test flow rate.
Camfil’s Scanning Electron Microscope (SEM), located at the laboratory in Trosa, is a great example of how committed we are to research and development. This unique tool allows us to study and identify contaminants as small as 50nm (=0,00005mm), found in used filters and air samples. The microscope is used as a problem solving and quality control capability for our customers, and also to study and evaluate new filter media.