Page 7 - index

The 24 criteria defining sealing and

electromagnetic shielding functionality

A | ELECTROMAGNETIC CRITERIA D | USAGE REQUIREMENTS

1 Frequency band used by system.
16 IP sealing
2 System’s power output. • Dripping
3 Level of attenuation needed from the shielding system. • Projection
• Immersion
4 Emission shielding protection or susceptibility
• Dust
5 Compliance with MIL G 83528, STD 285, 89/336/CEE shielding standards.
17 Is the system pressurized ? to what pressure ? with what gas ?

18 Nature of mounting and surface protection

B | REQUIREMENTS FOR EXTERNAL ENVIRONMENTAL AGGRESSION 19 Galvanic compatibility.

20 Positioning of product.
6 Working temperature (continuous and peak) and system storage temperature. • Time planned for positioning product
• Accessibility of mounting
7 Working and storage relative humidity. • Manual placement
• Automatic placement
8 Contact with aggressive substances : hydrocarbons, acids, solvents, NBC, gases...
• Adhesiveness of product
9 Salt fog resistance (number of hour’s exposure).
21 Frequency of opening and closing the equipment.
10 Product inflammability - Compliance with flame resistance standards UL 94 - V0 -V1 • Is the sealing system changed every time it is opened ?

C | PHYSICAL REQUIREMENTS E | FINANCIAL CONSTRAINTS

11 Mechanism precision, type of mechanism, means of achieving. 22 Planned budget for sealing and shielding.
• Sheet metal • Casting • Machining 23 Number of systems to be built ? At what rate?
• Molding • Plastic • 3D printing
24 Impact of these requirements on the system’s functionality.
12 Space available flat seal or fitted in a groove.

13 Gasket crush specification :
• Crush limits
• Number of screws and spacing between fixings • Tightening torque

14 Sealing system specification.

15 Vibration and shock resistance.

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