1.0JAKOB ALBERTSEN KOMPOSIT A/Shttps://jakob-albertsen.dk/en/Adminhttps://jakob-albertsen.dk/en/author/admin/rich600338<blockquote class="wp-embedded-content" data-secret="9tjSKPwKw2"><a href="https://jakob-albertsen.dk/en/c3-c4/">C3/C4</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://jakob-albertsen.dk/en/c3-c4/embed/#?secret=9tjSKPwKw2" width="600" height="338" title="“C3/C4” — JAKOB ALBERTSEN KOMPOSIT A/S" data-secret="9tjSKPwKw2" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://jakob-albertsen.dk/wp-includes/js/wp-embed.min.js </script> Corrosion protection according to C3 and C4 Corrosion classes C3 and C4, as defined in ISO 12944, describe environments with moderate to high corrosion stress. Correct selection of coating system and surface treatment is essential to ensure long service life and reduce maintenance costs in these environments. What do C3 and C4 corrosion classes mean? ... Read morehttps://jakob-albertsen.dk/wp-content/uploads/2025/11/foto-morten-fich-olsen.jpg