15/07/2026
Sikaplan® WT 4220-15 C is a high-performance waterproofing membrane made from flexible polyolefin (FPO-PE), reinforced with glass fiber and manufactured with a 1.5 mm thickness. It has been specially developed for the internal waterproofing of closed drinking water storage tanks.
Developed by Sika, a global manufacturer of construction chemical solutions, the product provides a reliable waterproofing system for water structures where hygiene, durability, and long service life are essential.
Thanks to its resistance to soft water and microbiological effects, Sikaplan® WT 4220-15 C offers a safe and durable solution for drinking water applications. The membrane can be welded with hot air, ensuring fully watertight and secure joints.
✔ Microbiological Resistance Provides resistance against bacteria and fungal growth, making it suitable for drinking water storage applications.
✔ Resistance to Soft Water Designed for safe use in environments where the membrane is continuously exposed to drinking water.
✔ Glass Fiber Reinforced Structure Improves dimensional stability and enhances mechanical performance.
✔ Hot Air Weldable Creates homogeneous and fully watertight joints between membrane sections.
✔ Flexible Polyolefin (FPO-PE) Formulation Offers excellent chemical resistance and long-term durability.
✔ Requires Professional Installation Expert application is recommended to achieve maximum hygiene, waterproofing performance, and system reliability.
Sikaplan® WT 4220-15 C is suitable for:
It is especially suitable for surfaces that are in direct contact with drinking water and require a reliable internal waterproofing layer.
Material: Flexible polyolefin (FPO-PE), glass fiber reinforcedThickness: 1.50 mmUnit Weight: 1.30 kg/m²
Roll Dimensions: 2.00 m × 20.00 m (Custom lengths available)
Surface Type: SmoothColor: Light blue
Ambient Temperature Range: +5 °C to +35 °CSurface Temperature Range: 0 °C to +35 °C
For drinking water storage systems, the most critical performance requirements are:
Sikaplan® WT 4220-15 C provides a reliable internal lining solution with its microbiological resistance, soft water resistance, dimensional stability, and secure hot air welded joints.
In water structures, installation errors can lead to serious long-term problems. Choosing the right membrane system combined with professional application ensures a safe, durable, and reliable waterproofing solution.
Yes. The membrane is resistant to microbiological effects and soft water, making it suitable for drinking water storage applications.
The membrane sheets are joined using hot air welding technology to create secure and watertight connections. Installation should be carried out by experienced professionals.
It can be used in closed drinking water tanks, portable water storage systems, reservoirs, dams, and reinforced concrete water structures.
Sikaplan® WT 4220-15 C has a thickness of 1.50 mm and is supplied in standard 2 m × 20 m rolls.
