Sanitary Silicone Sealant CERESIT CS25 Clinker 280 ml, mold-resistant MicroProtect

CERESIT CS25 Clinker 280 ml is a sanitary silicone sealant designed for sealing joints in ceramic and clinker surfaces. Supplied in a 280 ml cartridge, this sanitary silicone contains MicroProtect antimicrobial protection to reduce mold and mildew growth in wet environments. The formulation provides elastic, watertight joints suitable for bathrooms, kitchens and other sanitary areas where long-term resistance to moisture and microbial growth is required.

Advantages

The silicone offers durable elasticity that compensates for minor substrate movement while maintaining a tight seal. MicroProtect antimicrobial technology helps limit mould and mildew formation on the sealant surface, improving hygiene in humid conditions. The product is formulated for good adhesion to ceramic, clinker and many sanitary materials and cures to a flexible, waterproof bead suitable for exposed joints in sanitary installations.

Suitable for

• Sealing joints between tiles, clinker and sanitary ceramics
• Sealing around sinks, bathtubs and shower trays
• Joints around bathroom fixtures such as toilets and bidets
• Interior wet rooms, kitchens and shower enclosures

When it may not be suitable

This sanitary silicone is intended for interior sanitary and bathroom use; it is not formulated for structural glazing or heavy load-bearing joints. It may not adhere reliably to certain plastics, untreated metals, or oily/contaminated surfaces without appropriate primers or surface preparation. It is not specified for continuous immersion applications where specialized products are required.

Key specifications

• Volume: 280 ml cartridge
• Type: sanitary silicone sealant with antimicrobial protection
• Application areas: ceramic tiles, clinker, sanitary ceramics and related joints
• Properties: elastic after curing, waterproof, mould- and mildew-resistant surface treatment

How to use

Prepare joint surfaces by cleaning, degreasing and ensuring they are dry and free of loose material. Cut the cartridge tip and apply with a standard caulking gun, filling the joint evenly and smoothing the bead within the product's skin formation time. Allow full cure according to ambient temperature and humidity; curing times vary with joint depth and conditions. Remove uncured excess with suitable solvents; cured silicone can only be removed mechanically.

What to consider before purchase

• Confirm compatibility with the substrates to be sealed (tiles, clinker, sanitary ceramics).
• Check required colour match and availability for visible joints.
• Assess expected joint movement and choose a sealant width/depth appropriate for the joint size.
• Ensure proper ventilation during curing in confined spaces.

Usage recommendations

For best results, apply CERESIT CS25 to clean, dry surfaces at moderate temperatures and follow manufacturer curing times. Use a backer rod in deep joints to control sealant depth and avoid three-sided adhesion. Replace silicone if signs of deep penetration of mold or permanent damage appear; routine cleaning of the cured seal with mild detergent will help maintain hygiene.