Description
Maxisil N Natural Stone Silicone is a non-staining, neutral-cure silicone purpose-built for expansion joints in marble, granite, sandstone, quartzite, porphyry and other natural stone, where a general-purpose sealant risks a genuine, permanent problem: migration of softeners or other components into the edge of the stone, leaving a visible stain that can’t be removed. Maxisil N guarantees against that migratory staining, making it the correct choice specifically for natural stone rather than a standard silicone used out of convenience.
Beyond stain resistance, it offers high resistance to notches, tension and tearing, along with excellent weathering, ageing and UV resistance that keeps it from drying, cracking or becoming brittle over time. It’s non-corrosive and contains fungicides for genuine mould resistance, and its easy application with good tooling properties suits both flat wall joints and more demanding applications like natural stone swimming pools, including underwater joints.
Available in 22 colours, Maxisil N goes beyond standard solid shades to include structure colours with a genuine stonelike surface texture, plus matte-finish options for a less reflective joint line — both aimed at blending the sealant visually into the stone rather than standing out as an obvious synthetic line. Custom colours are also available on request for projects needing an exact match.
Technical Specifications
| Formula | 1-component neutral-cure silicone |
|---|---|
| Colour | 22 standard colours, including structure and matte finishes; custom colours on request |
| Size | Cartridge, sold individually or in boxes of 20 |
| Stress expansion modulus (100%) | 0.5 N/mm² (DIN 53 504, S3A) |
| Storage | +15°C to +25°C, dry, below 60% relative humidity |
Where to Use
- Sealing and jointing marble, granite, sandstone and quartzite, interior and exterior
- Movement joints in floors, walls and facades
- Natural stone swimming pools, including underwater joints
- Sealing of laminated and coated glass, and mirrors set against natural stone
How to Apply
- Clean the surface — remove all contaminants with Maxisil Cleaner on non-porous substrates or a steel-wire brush on porous ones.
- Prime if required — allow the primer to dry approximately 2 hours before applying sealant.
- Backfill deep joints — use a closed cell PE foam rod before sealing.
- Apply carefully — take care not to spread the sealant beyond the joint area, as it is difficult to remove from stone once cured.
- Tool with the correct technique — for matte colours, tool off in a single pass with Maxisil Smoothtex N to avoid polishing the surface.
Important Notes
- Do not use standard dishwashing detergent as a smoothing agent — it can stain marble and natural stone.
- Avoid contact with bitumen-containing materials and solvent-releasing products like butyl, EPDM and neoprene.
- Observe the printed shelf life on the packaging as a best-before indication.
