Sika

Sika is the materials company builders reach for when the job needs adhesives, sealants, waterproofing, concrete additives, or other construction chemistry. By our assessment, its strength is exactly that kind of practical range: one name covering products that help things stick, seal, and hold up on site. The downside is that this is not a glossy consumer brand; its value shows up inside walls, floors, joints, and repairs, which makes it easy to overlook until something needs fixing. In use it feels like a specialist supplier that lives close to the work, where performance matters more than packaging. Against general chemical makers, Sika sits in the construction-materials lane, and the Astrina catalogue places it in Switzerland.