Adheseal S100 Sanitary Silicone Sealant

For sealing tiled corners, joints between ceramic tiles and sanitary ware, and connections between kitchen benches and splashbacks, S100 Sanitary Silicone Sealant prevents mould growth while absorbing joint movement. This neutral-curing oxime silicone adheres to both porous and non-porous surfaces without corroding metal fixtures or attacking concrete.

How it works

S100 is formulated with added fungicide to inhibit mould and biological growth in hot, humid environments such as bathrooms, kitchens, and showers. Its oxime curing system releases a low-odour, non-corrosive byproduct, making it safe for use on glass, porcelain, aluminium, sanitary acrylics, and glazed or unglazed ceramic tiles. The cured silicone forms a permanently flexible, dustproof gasket that maintains a waterproof seal across substrates with different thermal exposure coefficients.

Numbers that matter

• ±30% movement capability: Accommodates joint expansion and contraction in tiled corners and connecting joints without losing adhesion (note: physical properties tables show ±30% capability; general description lists ±25%).
• 300% elongation at break (ISO 8339): High elastic threshold before tearing under mechanical stress.
• 2mm per day cure rate: Cures at 2mm depth per 24 hours at 25°C and 50% relative humidity, requiring atmospheric humidity to complete the reaction.
• -50°C to 150°C temperature resistance: Maintains its flexible seal under extreme service conditions, from external balconies to hot water splashbacks.
• 43g/L VOC: Low-toxicity formula conforming to the Californian Bureau of Air Quality Management Rule 1168.

Where to use it

S100 is suitable for internal and external applications on the following substrates:

• Glazed and unglazed ceramic tiles, porcelain, and vitreous enamel
• Glass partitions and glass-to-tile joins
• Laminated kitchen benches and splashbacks
• Sanitary acrylics, fibreglass, and rimless sinks
• Aluminium and anodised surfaces

Limitations

Do not use S100 Sanitary Silicone Sealant in the following situations:

• In totally confined spaces where the sealant cannot access atmospheric moisture to cure.
• For structural glazing or adhering mirrors (use N-80, N-60, or High Power 609 as directed).
• On polycarbonate sheeting or composite panels.
• On copper and brass, as the sealant may cause discolouration.
• For underwater applications, including aquariums, swimming pools, and ponds (though once cured, it is suitable for below-waterline contact).
• On natural stone without a prior stain test. S100 is recommended for marble and granite only after stain testing.
• Where painting is required; this silicone is not paintable.
• Do not clean or treat the joint with solvents or chemical agents during the curing window, as they may discolour or degrade the sealant.

Installation and joint design

For internal joints, maintain a minimum joint width and depth of 5mm. For external joints, maintain a minimum width of 10mm. Use a 2:1 width-to-depth ratio wherever possible. For joints deeper than 10mm, install a backing rod 25% larger than the joint width to control depth and prevent three-sided adhesion.

All substrates must be dry, structurally sound, and clean. Clean non-porous surfaces with the two-wipe process using Acetone or 100% White Spirits before application. Concrete must cure for a minimum of 28 days to prevent moisture-driven delamination and mould growth under the seal. If priming is required, use Adheseal 50A for non-porous surfaces or Everflex Supaprime for porous substrates.

Apply the sealant between 5°C and 40°C. Tool the joint with a moistened spatula within the 15 to 20-minute skin time. Clean wet tools and excess sealant with white spirit or turps; cured sealant must be removed by mechanical means.