Efficiency against Alternaria alternata
Micro-organisms are omnipresent in our environment and have the ability to grow
even under unfavorable conditions. This makes the use of micro-biocides necessary
in order to provide long-term protection against growth on surface coatings. The
choice of a suitable biocide and its optimum dosage require knowledge of the micro-organisms
that may grow.
Typical contaminations by Alternaria alternata
Alternaria alternata is a type of fungus that will develop on any paint surface
which is periodically moist and which can provide sufficient nutrients. In practice
this means that, without a fungicide, all external coatings films are liable to
fungal colonization unless they are located in very dry situations. The relatively
dry conditions inside buildings do not favor fungal growth and that which does occur
is normally restricted to paint surfaces which are periodically wet (kitchens and
Alternaria alternata growth on a paint film normally appears as dark spots on the
surface and is sometimes confused with dirt. As well as disfiguring the surface,
the organism can actually penetrate the film and make it more permeable to water.
Growth can also develop under the film and causes loss of adhesion. Alternaria organisms
multiply by producing spores and these can be a significant health hazard to people
with respiratory allergies.