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3.3 Sealings
3.3. This chrome finish frequently used for EMC housings, because
of its electrical conductivity. applied by
immersion, spray-painting electrolytically.
Different sealing levels are created, depending the housing combination. The so-called permanent set measured accordance with DIN
53517.
3.
After the seal has been exposed prolonged pressure stress, its elasticity is
tested.
For housings deployed very rough environments, layer powder
coating applied over the chrome. The chrome layer consists chrome compound created
with chrome containing acidic alkaline solutions.3.2.18 3.19: Typical colour variations
Housings made aluminium alloys can protected from corrosion by
chrome plating.1 Type seals
Connectors always consist two more parts and therefore must sealed
accordingly. This problem tolerated, because yellow chrome plating is
very inexpensive, and does not contain substances that are harmful health.2). The user determines the test time and temperature, well the
. The seal between the bulkhead mounted housing and the
mounting surface stressed only once, during installation (the two parts are
usually screwed together), and remains position afterwards. The type seal chosen based the required degree of
protection (refer Sections 2.4 Yellow Chrome-plating
Fig.4 and 3. The colour the coating is
determined varying the process duration and type, well the layer
thickness. disadvantage this kind coating that
the colour varies considerably; yellow chrome layers range from light yellow
to dark brown.17 3.Hoods and Housings 33
3.2. Defined samples the seal material are inserted between two
polished steel plates and then compressed the dimension specified the
standard.
Mating forces stress the seal between the upper and the lower bulkhead
mounted housing
