Construction Silicones – How to Choose the Right Sealant for Every Surface

Neutral vs acetic silicones – key differences

Neutral silicones like CERESIT Neutralni silikon CS 26 fusion hero 280ml do not release acetic acid and are safe for metal surfaces, mirrors and natural stone. Acetic silicones are cheaper but corrode copper and brass, making them unsuitable for installations with metal components. Always choose neutral or sanitary grades for bathroom applications.

Sanitary silicones – protection against mold and moisture

Sanitary silicones such as BISON SILIKON SANITARNI BELI 280 ml contain fungicides that prevent mold growth in humid environments. Brands like CERESIT and SIKA offer formulations with extended protection, ideal for joints around bathtubs, shower enclosures and kitchen sinks. Always verify 'sanitary' or 'anti-fungus' labeling on the packaging.

Application on glass and aluminum

For sealing windows and glass surfaces, use neutral silicone that won't attack protective coatings on glass. HENKEL and BISON offer specialized formulas with UV protection that prevents yellowing in sunlight. Avoid acetic silicones on anodized aluminum as they can damage the surface finish.

Surface preparation and application techniques

The surface must be clean, dry and degreased before applying silicone – residues of soap, limescale or dust reduce adhesion by over 50%. Use a silicone gun with consistent pressure and cut the cartridge tip at a 45-degree angle for a more uniform bead. After application, smooth with a wet finger or silicone spatula within 5-10 minutes.

Drying and curing time

Surface drying takes 10-30 minutes, but full curing requires 24-48 hours depending on bead thickness and ambient humidity. Do not expose fresh silicone to water during the first 24 hours – this can compromise elasticity and adhesion. Brands like SOMAFIX and INTERHEM also offer fast-curing formulas for urgent repairs.

What to check before buying

Verify the application temperature range – most silicones work between +5°C and +40°C, but TKK TEKAPUR offers winter grades for use down to -10°C. Cartridge volume is typically 280ml or 310ml, with professional 600ml tubes available for larger projects. Choose brands with clear labeling about intended use and certifications such as DIN or ISO standards.

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