Anti-drumming of the hull

You glue zincor plates on the under surface to be anti-drummed with Vibradamp A90-P anti-drumming paste . The minimum thickness which you keep here is 4 : 1 : 1. if the under surface is 4 mm thick, then the layer thickness of the two component paste (Vibradamp A90-P) is 1 mm and the thickness of the zincor plate is also 1 mm. You need per square meter (with a layer thickness of 1 mm) around 1,5 kg of paste.

There are two ways to place the plates: you can smear the surface and then press the steel plates into the paste, or you can smear the plates themselves and then press these firmly onto the surface. We advise to smear the surface itself; in this way you use more material but this is much less labour intensive.

The zincor plates are delivered in a length of 20 cm (10 cm width). Possible curves on the surface can therefore be easily covered without having to bend the plates. In any case, for optimal anti-drumming these places where the vibrations are introduced must be treated. This is around the engine foundation and the surface above the propeller. The bigger the surface anti-drummed, the better the result. In the case of strict noise requirements, e.g. all engine room partitions, the tanks and the area of the engine room bulkhead to the after peak are anti-drummed.

In the engine space anti-drumming is mostly combined with absorption. Especially for shipping we have CE-certified Merfocell GW. Merfocell GW can be stuck over Vibradamp A90-P and steel plates (attention: first allow Vibradamp A90-P dry well). If the under surface is not really flat it is recommended to level the surface with contact glue prior to application.