Adheseal S100 Sanitary Silicone Sealant

Adheseal S100 is our flagship sanitary silicone sealant for bathrooms, showers, kitchens and tiled wet areas. This neutral-cure, anti-fungal silicone is designed for the joints that see daily moisture and movement, including tiled corners, shower screens, baths, basins, sinks, sanitary ware, benchtops and splashbacks.

S100 has become the core sanitary silicone in the Adheseal range because it combines broad wet-area substrate compatibility with a large tile and grout coordinating colour range. It cures to form a smooth, permanently flexible waterproof seal and uses neutral oxime chemistry that will not corrode compatible metal fittings or attack concrete.

Bathroom and shower silicone built for wet areas

S100 contains added fungicide to help inhibit mould and biological growth in hot, humid environments. That makes it particularly suited to bathrooms, showers, laundries, kitchens and other areas where the seal around tiles, glass and sanitary fittings is repeatedly exposed to water and steam.

Typical applications include movement joints between tiles, wall-to-floor corners, shower-screen interfaces, joints between sanitary ware and tiles, bath edges, rimless sinks, benchtops, cupboards, splashbacks and glass partitions.

Why choose S100 sanitary silicone?

• Anti-fungal wet-area formulation: helps inhibit mould and mildew growth in humid bathrooms, showers and kitchens.
• Neutral cure: non-corrosive to compatible metals and suitable around concrete, tiles, glass, aluminium and sanitary fixtures.
• Permanent flexibility: accommodates movement between adjoining materials while maintaining the seal.
• 300% elongation: provides strong elastic capacity before rupture.
• More than 90% elastic recovery: helps the cured bead recover after extension or compression.
• UV stable and colour fast: suitable for internal and external applications.
• Broad colour range: designed to coordinate with common grout, tile, benchtop and decorative finishes.
• Low odour and low VOC: well suited to occupied residential and commercial wet areas.

Suitable surfaces

S100 is suited to glazed and unglazed ceramic tiles, porcelain, vitreous enamel, glass, laminated kitchen benches and splashbacks, sanitary acrylics, fibreglass, aluminium and many compatible stone surfaces. Natural stone should always be stain-tested before full application.

The product can also form flexible seals between materials with different thermal expansion rates, which is useful where tile, glass, aluminium, acrylic and benchtop materials meet in the same installation.

Colour-matched silicone for tiled bathrooms and kitchens

A sanitary joint is highly visible once the bathroom or kitchen is finished. S100 is available in a broad range of whites, greys, warm neutrals, darker architectural tones and translucent options so the silicone can be coordinated with grout, tiles, benchtops and fixtures rather than treated as an afterthought.

For a deliberately low-sheen finish, compare Matt Seal S-350, which is designed for modern tiled wet areas where a traditional glossy silicone bead can stand out.

Joint preparation and application

All surfaces must be structurally sound, stable, dry and clean, with dust, grease, oil, curing compounds and old sealant removed. Concrete should cure for at least 28 days before sealing. Clean non-porous surfaces using a suitable two-wipe process and adhesion-test variable or sensitive substrates before full installation.

Where possible, design the joint so the silicone bonds to two sides only and can move freely. Use backing rod or bond-breaker tape where required to control depth and prevent three-sided adhesion. Apply S100 between 5°C and 35°C and tool the joint before the surface skins.

S100 skins in approximately 20 minutes and cures at around 2 mm per day at 25°C and 50% relative humidity. Temperature, humidity, substrate porosity and joint dimensions all affect cure speed.

Important limitations

• Do not apply S100 underwater or use it in aquariums, swimming pools or ponds.
• Do not use for structural glazing or mirror bonding.
• Do not use on polycarbonate sheeting or untested composite panels.
• Test marble, granite and other natural stone for staining before use.
• The sealant may discolour copper and brass.
• S100 is not paintable.
• Do not use in totally confined joints where atmospheric moisture cannot reach the sealant.

S100 or Matt Seal S-350?

Choose S100 when you want the established gloss sanitary silicone with the broadest colour choice for general bathroom, shower, kitchen and tiled wet-area work.

Choose Matt Seal S-350 when the joint finish is part of the design and a matt Arctic White or Ebony bead will integrate better with modern tiles, grout and fixtures.

Compare other specialist wet-area options in our Sanitary Silicone Sealants range.