The technical properties vary depending on the grade. KFPA is black, has a grammage of 792 g/m², a thickness of 2.20 mm, and a density of 0.36 g/cm³. FFDL is blue and is designed for a range of 800 to 1,500 g/m², 0.80 to 1.50 mm thickness, and 0.90 to 1.00 g/cm³ density. FFHL is light beige and ranges from 700 to 1,500 g/m², 0.70 to 1.50 mm thickness, and also 0.90 to 1.00 g/cm³ density. These differences are important for selection when installation height, weight per unit area, and material behavior must be matched to the application.