<p>Our cast (ductile) iron grates are supplied with a <strong>black, water-based coating</strong> as standard.</p><p> </p><p><span class="text--primary"><strong>Important note:</strong></span> Cast iron is a natural material. Over time, exposure to the elements causes a thin layer of iron oxide to form. This changes the appearance, and the originally black surface takes on a <strong>brownish-reddish patina</strong>.</p><p>Coatings such as KTL can only slow down this process, but cannot prevent it permanently. Oxidation is a natural process that does not affect the quality, stability or service life of the product.</p><p>If required, the gratings can also be coated locally with bitumen or epoxy to meet specific regional requirements.</p><p> </p><p>If you have any further questions, please do not hesitate to contact our <a href="/en-at/contact"><u>customer service team</u></a>.</p>