Sikasil 825 Low Modulus silicone sealant, neutral-cure (380ml)

Sikasil 825 is a premium-grade, one-part neutral-cure silicone designed for high-performance sealing tasks. This alkoxy-based formula is notably low-odour and non-corrosive, offering exceptional elasticity and resilience against the elements. Suitable for both internal and external applications, it provides a dependable, primer-free bond to a vast range of building materials, making it a preferred choice for professional glazing, weatherproofing, and façade joints.

Features & Benefits

• Neutral Alkoxy Formula: A non-corrosive, low-odour sealant that is safer and more pleasant to use in confined or poorly ventilated spaces.

• Exceptional Flexibility: A low-modulus sealant capable of +/- 25% movement, ensuring joints remain intact during significant thermal expansion and contraction.

• Broad Adhesion Profile: Bonds effectively to uPVC, glass, timber, masonry, stone, and various metals (including powder-coated aluminium) often without requiring a primer.

• Professional Finish: Its slow-skinning properties and excellent tooling characteristics make it ideal for managing larger or more complex joint applications.

• Durable Weatherproofing: Engineered to resist UV radiation, ageing, and extreme weather, maintaining its integrity and appearance over the long term.

• Fully Compliant: Certified to meet ISO 11600 F/G 25 LM and EN 15651 façade standards, alongside CE and UKCA markings.

Common Applications

This versatile silicone is frequently used for:

• Perimeter Pointing: Sealing around window and door frames made of timber, uPVC, or aluminium.

• Soft Metal Work: Ideal for adhering and sealing lead, copper, and zinc without the risk of chemical corrosion.

• High-Rise & Exterior: Weatherproofing for curtain walling, parapets, and roof perimeters.

• Glazing Projects: Perfect for glass-to-glass bonds, glazing beads, and expansion joints.

• Specialist Surfaces: Fully compatible with terracotta, stone, and insulated glass units (IGUs).

Technical Specifications