Sanitary Silicone Sealant CERESIT MicroProtect CS 25 — Graphite, 280 ml

CERESIT MicroProtect CS 25 — Graphite, 280 ml is a sanitary silicone sealant formulated for indoor bathroom and sanitary joints. Supplied in a 280 ml cartridge, this silicone provides a flexible, watertight seal for connections around sinks, bathtubs, showers and tile transitions. The graphite color offers a neutral dark finish that blends with darker tiles and fixtures. The product is intended for use on common non-porous substrates found in sanitary environments and is designed to resist moisture and microbial growth.

Advantages

The sealant cures to an elastic, durable bead that maintains adhesion on glazed ceramics, enamel, glass, glazed tiles and many plastics. Its antimicrobial properties reduce the risk of mold and mildew formation in wet areas, and the cured silicone remains resistant to water and household cleaning agents. The cartridge format is compatible with standard caulking guns for controlled application.

Suitable for

• Sealing joints between sinks, bathtubs and walls
• Sealing shower enclosures and tray perimeters
• Sealing tile-to-tile or tile-to-fixture transitions in bathrooms
• Interior sanitary and wet-room applications on non-porous surfaces

When it may not be suitable

This sanitary silicone is formulated for non-porous indoor surfaces; it is not designed for porous substrates such as unsealed concrete, untreated wood or drywall where a primer or a different type of sealant would be required. It is also not intended for structural glazing, load-bearing joints or continuous outdoor exposure where weathering resistance and different formulation properties are needed.

Key specifications

• Color: Graphite (dark grey)
• Volume: 280 ml cartridge
• Type: Sanitary neutral-cure silicone sealant
• Cure: Moisture-curing to an elastic silicone rubber
• Primary properties: Flexible, waterproof, antimicrobial-treated
• Compatible substrates: Glazed ceramics, enamel, glass, glazed tiles, many plastics

How to use

Ensure all joint surfaces are clean, dry and free of grease, old sealant and loose material. Cut the cartridge nozzle to the desired bead size, load into a standard caulking gun and apply a continuous bead along the joint. Tool the bead within the product’s skin formation time to ensure proper contact and a neat finish. Allow the sealant to cure fully according to ambient temperature and humidity before exposing the joint to water; curing time may vary with conditions.

What to consider before purchase

• Confirm substrate compatibility — designed for non-porous surfaces such as glazed tiles, glass and enamel
• Assess the joint width and depth to determine if a 280 ml cartridge provides sufficient volume
• Verify that a neutral-cure sanitary silicone is suitable for adjacent materials and any sealant-specific requirements
• Consider matching the graphite color to existing tiles and fixtures for visual consistency

Usage recommendations

For best results, use on clean, dry surfaces and tool the sealant immediately after application for a smooth finish. Store unopened cartridges in a cool, dry place. When sealing bath and shower joints, allow full cure before regular use to ensure long-lasting mold-resistant performance.