Home ARDEX X78 - Flexible cement-based adhesive for low porosity materials €39.60 Flexible cementitious adhesive for low porosity flooring materials. Powder based on cements, additives, special additives, MICROTEC fibres and flexible synthetic materials. The application time is approx. 5 hours. The mortar hardens by hydration and drying. Complies with EN 12004 C2 FEE S1. View