Sanitary silicone in concrete grey for precise joints in bathrooms and showers
For demanding sealing tasks in bathrooms and sanitary areas, OTTOSEAL® S 100 in concrete grey (C56) offers a reliable, professional-grade sanitary silicone based on high-quality acetate. The neutral grey tone blends perfectly with modern tile designs in stone or concrete look. This single-component silicone is mould-resistant, UV-stable and suitable for both indoor and outdoor use. Thanks to its stable, pasty consistency, the sealant can be applied precisely and smoothed cleanly – ideal for connection and movement joints around showers, bathtubs, and washbasins. OTTOSEAL® S 100 stands out with permanent elasticity, high temperature resistance, and excellent adhesion on many common substrates – without the need for a primer.
Typical applications:
- Sealing joints in bathrooms and sanitary areas (shower, bathroom, WC)
- Connection joints on ceramics, glass, acrylic tubs or shower partitions
- Movement joints in wall and floor areas
- Product features of the sanitary silicone:
- Sanitary silicone with fungicidal formulation
- Resistant to UV, weathering, and ageing
- Elastic with up to 25% movement capability
- High temperature resistance (-40 °C to +180 °C)
- Skin formation after approx. 10 minutes
- Primerless adhesion on many materials
Application notes:
Substrates must be clean, dry and stable. After application, the joint should be formed with suitable smoothing agent and tool. For best results, use in combination with coordinated accessories.
Is this silicone suitable for wet areas like showers?
Yes, this sanitary silicone is specially developed for permanently wet environments.
Thanks to its mould-resistant acetate-based formulation, OTTOSEAL® S 100 is ideal for use in areas exposed to constant moisture, such as showers, bathtubs, and around washbasins. The fungicidal protection effectively prevents mould growth even in areas with standing water or poor air circulation, ensuring a hygienic and visually clean joint – even with daily use.
How elastic is the silicone after curing?
It remains permanently flexible with up to 25% movement absorption.
After full curing, OTTOSEAL® S 100 retains excellent elasticity and accommodates movement in the substrate due to temperature changes, material expansion, or building motion. This is crucial in bathrooms where materials are constantly under stress. The joint remains intact and watertight in the long term.
Can I use the sealant outdoors?
Yes, the sanitary silicone is UV- and weather-resistant.
In addition to indoor sanitary use, this silicone is suitable for outdoor applications such as glass blocks, window connections, or weather-exposed expansion joints. It resists UV radiation, rain, and temperature fluctuations, maintaining colour and elasticity even under direct sunlight – provided the substrate allows sufficient adhesion.
Is a primer required before application?
Only on difficult substrates like highly absorbent or very smooth materials.
On standard tiles or ceramics, OTTOSEAL® S 100 usually adheres without a primer. For problematic surfaces like concrete, natural stone or aluminium, a primer may be necessary to ensure reliable bonding. When in doubt, conduct an adhesion test or consult the manufacturer.
How quickly can the silicone be loaded or exposed to water?
Skin formation starts after approx. 10 minutes; full curing takes several days.
Depending on the joint size and environmental conditions (temperature, humidity), OTTOSEAL® S 100 cures at approx. 2–3 mm per day. For a fully waterproof seal, the joint must be completely cured. Until then, avoid water contact or mechanical stress, which could impair adhesion and appearance.
How should I store the sanitary silicone?
Store it cool, dry, and frost-free – ideally between +5 °C and +25 °C.
Always keep the original packaging away from direct sunlight. Under optimal storage conditions, the shelf life is up to 24 months. Heat, moisture, or frost can impair workability, so ensure stable, dry conditions.
Can I repair damaged joints in sections?
Yes, partial repairs are possible using the sanitary silicone.
A damaged or leaking joint section can be removed and replaced with fresh silicone. Make sure adjacent areas are clean and grease-free for proper bonding. A primer may improve adhesion at the interface with old material. Small damages can thus be repaired without replacing the entire joint.
What’s the best way to smooth the silicone?
Use a compatible smoothing agent and proper jointing tool.
After application, the silicone should be shaped within the skin time using a suitable tool and non-aggressive smoothing agent. This ensures a smooth, closed surface that resists dirt and water. Avoid using dish soap, as it may impair curing and adhesion.
Is the product chemically resistant?
Yes, once cured it resists many common household cleaners.
After full curing, OTTOSEAL® S 100 withstands most standard cleaners, soapy water, and mildly acidic agents. Avoid highly alkaline or solvent-based cleaners, or test them beforehand in an inconspicuous area to rule out discolouration or damage.
Do you have any questions on this item?
