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Screening Comparison Graphs

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Graphs showing effectiveness

We test many products to see how effective they are, and only stock those we feel offer the best protection for the best value.

The first graph is in decibels (dB) reduction as most suppliers quote these numbers and you can compare them with other products. Further down we have more useful graphs about exposure levels left after using the screening materials. Please note that we do not stock many of the items any more, but we leave the graphs up for information.

Power Density Reduction - all products

The next four graphs show the remaining RF signals after you have shielded against a 1 V/m or a 3 V/m incoming signal with a single layer or with two layers of screening material.

Most electrically sensitive people should be aiming to reduced their exposure below about 0.05 V/m. Some EHS people can be OK at higher levels and some need to get the levels down under 0.02 V/m or even lower. The graphs help you decide just how much screening you need. Remember that microwaves sneak in through any gaps in screening or poorly screened parts like windows, doors, ceilings and, if upstairs, floors. So before screening we strongly recommend that you measure the signals with a sensitive peak-reading RF meter that measures from a few hundred megahertz up to about 6000 MHz (6 GHz). Our Acoustimeter and Acousticom2 meters are most suitable.

1 V/m remaining single layer screen 1 V/m remaining single layer screen

3 V/m remaining single layer screen 3 V/m remaining single layer screen

The following graphs show the percentage effectiveness at reducing the signal strength (measured in volts per metre) - which is what most EHS people react to. The power density (PFD) falls much faster and a graph of percentage PFD looks much more impressive but is really not helpful to people suffering from EHS symptoms.
effectiveness V/m % screen effectiveness V/m % screen

The power density (PFD) falls much faster and a graph of percentage PFD looks much more impressive but is really not helpful to people suffering from EHS symptoms. It is included here for completeness and for comparison with claims by other screening companies.
effectiveness V/m % screen