Intercide™ DBF-10 911P is based on the active ingredient 4,5-dichloro-2-n-octylisothiazolin-3-one (DCOIT) which is highly effective against a broad spectrum of microorganisms. It is supplied as a liquid at room temperature and incorporated into a phthalate carrier. Intercide™ DBF-10 911P is designed to provide fungicidal protection and resistance to algal growth. DCOIT active has good resistance to UV and to water leaching, properties which render the product most suitable for use in a variety of outdoor applications based on calendering and extrusion techniques. DCOIT has very low water solubility (2ppm) so the product may not always be readily available on the surface. In weathered and high moisture applications, DCOIT performs excellently and in many cases for a longer period than actives which readily leach away. DCOIT is incorporated into Intercide™ DBF-10 911P at the level of 10% and as such the addition levels recommended are in the range of 0.8% rising to 2.0% for the more demanding applications. Intercide™ DBF-10 911P added at 1.0% gives an addition of 0.1% or 1000ppm of active biocide.