Silicone for demanding sealing applications in wet areas
OTTOSEAL® S 100 in the shade joint grey glossy (C71) is a high-quality silicone sealant, ideal for professional sealing in bathrooms and other wet environments. It ensures a uniform appearance, is easy to apply and shape, and offers strong resistance to mould, UV exposure and weathering.
Typical applications and properties:
This single-component acetoxy silicone is designed for professional use in wet rooms and is especially suitable for:
- Connection and expansion joints in showers, bathrooms or toilets
- Sealing around washbasins, bathtubs and sanitary fixtures
- Joints at glass blocks or profile glass
Its non-sag, pasty consistency allows precise application and clean smoothing with finishing tools – perfect for high-quality joints.
Key benefits at a glance
Thanks to its fungicidal formulation, OTTOSEAL® S 100 offers long-term protection against mould and bacterial growth – even under constant moisture exposure.
Additional advantages:
- High UV and weather resistance
- Temperature resistant from -40 °C to +180 °C
- Permanently elastic under movement up to 25 % (EN 15651)
- Skin formation after approx. 10 minutes
- Good adhesion on common substrates without primer
Even under long-term stress, the sealant remains dimensionally stable and elastic – ideal for long-lasting use in bathrooms, kitchens and outdoor areas.
Technical data:
- Skin formation: ~10 minutes (23 °C / 50 % RH)
- Curing after 24 hrs: 2–3 mm
- Application temperature: +5 °C to +35 °C
- Consistency: pasty, non-sag
- Shore A hardness: approx. 20
- Elongation stress at 100 % (ISO 37): ~0.3 N/mm²
- Tensile strength (ISO 37): ~1.8 N/mm²
- Volume shrinkage: ~5 %
- Temperature resistance: -40 °C to +180 °C
- Shelf life: 24 months (cartridge), 15 months for matte colours
- Standards: EN 15651 Part 1–4, EMICODE® EC1-Plus, IVD-certified, REACH compliant
Application and maintenance:
Surfaces must be clean, dry, free from grease and load-bearing. On smooth substrates such as glass or stainless steel, primers may be required. After application, shape the joint with a suitable smoothing agent. The finished joint is easy to clean and remains hygienic with a damp cloth.
Accessories for best results:
For problematic substrates or complex shapes, primers and professional smoothing agents are recommended to ensure strong adhesion and a clean finish.
Perfect for demanding professionals
OTTOSEAL® S 100 joint grey glossy (C71) combines excellent performance, application comfort and a subtle colour tone – ideal for precise sealing in modern bathrooms, kitchens and permanently wet zones.
Is the premium silicone suitable for splash water areas?
Yes, it is designed for permanently wet areas.
OTTOSEAL® S 100 Premium sanitary silicone is ideal for use in showers, bathrooms, and other wet zones. Its fungicidal formula offers long-term protection against mould – even under constant splash water exposure.
Can I use OTTOSEAL® S 100 on natural stone?
No, this silicone is not suitable for natural stone.
On sensitive substrates like marble or sandstone, edge zone staining may occur. For such applications, special silicones developed specifically for natural stone should be used to prevent discolouration.
How do I apply the silicone at low temperatures?
Usable from +5 °C – pre-warm the cartridge if needed.
Application is possible from +5 °C. In cooler conditions, it is recommended to bring the cartridge to room temperature to ensure consistent flow and smooth joint finishing.
How long does it take to cure?
Skin forms after approx. 10 minutes, full cure depends on depth.
Under standard conditions (23 °C, 50% RH), a skin forms after about 10 minutes. The curing rate is around 2–3 mm per day. Full mechanical and moisture resistance is achieved only after complete curing.
Does colour shade C71 match concrete-look tiles?
Yes, fugengrau blends very well with such surfaces.
The neutral, slightly cool tone of C71 (fugengrau glossy) harmonises with concrete or stone-look tiles. It subtly highlights the tile structure and creates a clean, understated joint appearance.
How do I ensure mould-resistant silicone joints in the long term?
Good ventilation and cleaning are key.
Besides the fungicidal properties of the silicone, proper maintenance is essential. Residual water should be removed after use, and the area should be well ventilated. This keeps the joints hygienic and free from mould.
Can this silicone be used outdoors?
Yes, it is suitable for interior and exterior use.
Thanks to its UV and weather resistance, OTTOSEAL® S 100 is also suitable for outdoor use – for example on glass blocks or façade elements. Proper substrate preparation and temperature during application are important.
How long can the product be stored?
Up to 24 months if stored cool and dry.
Cartridges must be kept sealed, dry, and frost-free. Coloured versions can be stored for up to 24 months; matte colours for up to 15 months.
Which accessories are recommended for application?
Use of suitable primers and smoothing agents is advised.
To ensure optimal adhesion, especially on challenging substrates, compatible primers should be used. A silicone-safe smoothing agent like OTTO Joint Smoother helps achieve neat, clean joint edges.
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