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Home  > Forum  > Coatings & raw material failures  > Oyster attack on silicone coatings

Tuesday, 02 June 2020

Oyster attack on silicone coatings

2 Posts

Friday 01 November 1996 1:00:00 am

We use silicone coatings in the water intakes to our power plants to prevent shell build-up and later release which may
cause condenser or heat exchanger plugging. The paint has worked well in the past. This year, oysters have easily attached
themselves to fresh coatings. This is the first time we have had oyster problems. Very warm summer here. anyone else having
oyster attack on silicones? any known reason oyster can attach but barnacle can't?

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Friday 29 November 1996 1:00:00 am

If barnacles and similar organisms have never before attached themselves to silicone coatings and are now found to do so on
freshly applied coatings, the reason can only be changes that have occurred in the meantime. If the water quality is the same as
before, the reason must be the silicone coating itself. Possible reasons can include changes in formulation of the coating and/or
the conditions prevailing during application and film formation. It is a known fact that the attachment of lower marine organisms
on surfaces immersed in water is influenced by the mechanical, energetic and chemical nature of these surfaces. This explains
why certain marine organisms prefer certain materials, whilst others reject them. This is probably the reason for the different
behaviour of oysters and barnacles with regard to depositon on silicone coatings. In the case of barnacles and other members
of the biological order Cirrepedia it is known that they prefer rough, hydrophilic surfaces. They can only adhere firmly to a
given substrate after giving off a likewise hydrophilic, albuminous secretion which acts as adhesive. It follows therefore, that
these organisms will not adhere to the very smooth, hydrophobic silicone coatings. Oysters, on the other hand, with their thicker
and deeper bottom half, are able to adhere frimly to surfaces, thanks to their porous, permeable shell structure. Oysters,
incidentally, react quite differently towards certain heavy metals than barnacles and many other lower marine organisms. They
will thrive only if the water contain at least 0.004 mg of copper per litre. Oysters, like certain other mussels can accumulate
copper in their bodies without suffering any ill effects.

Yuvraj Bhadane
PROF.

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Friday 29 March 2019 1:35:51 pm

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