Würth White Silicone Filler S is a professional-grade, low-modulus neutral-cure silicone sealant suitable for windows, doors, glazing, façades and a wide range of general building applications.

Its flexible formulation offers excellent adhesion to many traditional materials used throughout the construction industry. Once cured, the silicone remains permanently elastic, helping it accommodate movement around frames, glazing systems and building joints without becoming brittle.

The clean white finish makes it particularly suitable for sealing around white window and door frames where a neat, professional appearance is required. It is easy to extrude and smooth, helping both professional installers and homeowners achieve a tidy, consistent seal.

Würth White Silicone cures through contact with moisture in the air and is odour-free during application for improved working comfort. Its good resistance to ultraviolet exposure also makes it suitable for both internal and external applications.

Key benefits

• Professional low-modulus neutral-cure silicone
• Clean white finish
• Excellent adhesion to common building materials
• Permanently flexible after curing
• Very good elastic recovery
• Good resistance to UV exposure
• Odour-free during application
• Easy to extrude and apply
• Smooths easily for a clean, professional finish
• Suitable for glazing, windows, doors and façades
• Suitable for interior and exterior applications
• Supplied in a 310ml cartridge
• Complies with DIN 18545-E and ISO 11600 F + G, Class 25LM
• SNJF 25E classified for glazing and façade applications

Suitable applications

Ideal for sealing around:

• UPVC windows and doors
• Window and door frames
• Glass and glazing systems
• Façades
• Construction and movement joints
• Interior and exterior finishing work

Directions for use

Ensure the surfaces are clean, dry and free from oil, grease, dust and any loose material that could affect adhesion.

Apply using a suitable manual, electric or pneumatic sealant gun. Fill the joint evenly and smooth the silicone using an appropriate finishing tool before the surface begins to cure.

For best results, the seal depth should generally be approximately half the joint width, with a minimum recommended depth of 6mm.

Fresh, uncured silicone can be removed using a suitable cleaning product.

Important information

Adhesion and compatibility can vary between surfaces. Test the silicone on a small, inconspicuous area before full application, particularly when using it on coated, painted, porous or sensitive materials.

Always follow the manufacturer’s current technical and safety guidance before use.