K-FLEX K-FIRE firestopping solutions are economical, versatile, easy to install and, above all, reliable. Each solution of K-FLEX K-FIRE is tested by independent and recognized laboratories and evaluated according to the current standard of fire resistance test. K-FLEX constantly develops new products and solutions able to satisfy all the requirements of the market. Using advanced fire resistant materials, we support fire engineers in finding the best solution to protect from fire critical elements like ventilation duct, cable tray lines, pipelines and structural elements like pillars, beams and stay cables. K-FLEX provides standard solution tested by independent laboratory or customized solutions designed and developed in strict cooperation with customers.