Neutral silicone sealant for stone is a single component, neutral curing, elastic sealing material designed specifically for natural stone (marble/granite, etc.). Its core features are non polluting, non corrosive, high elasticity, weather resistance, and waterproofing. It is widely used in dry hanging curtain walls, stone joints, and peripheral edge finishing.
1、 Core Definition and Key Characteristics
Type: Single component, room temperature neutral curing (dealcoholization type), free of acidic substances and harmful plasticizers.
Core advantage (pollution prevention): The formula has no oil leakage or migration, avoiding yellowing, blackening, and oil spots caused by ordinary glue on the stone, making it a “lifeline” specifically for stone.
Basic performance:
After solidification, the elastic material has a displacement capacity of ± 25% to ± 35% and is suitable for thermal expansion and contraction.
Temperature resistance * * -50 ℃~150 ℃ * *, UV, ozone, rainwater resistance, outdoor durability of 10 years+.
It is non corrosive to stone, glass, metal, and concrete, with strong adhesion, and in most cases does not require primer.
Environmental Protection: Neutral curing with low odor, free of formaldehyde and benzene, suitable for indoor and outdoor use.
2、 Main purpose (scenarization)
Dry hanging stone curtain wall: marble/granite curtain wall joints are weather resistant, sealed, waterproof, anti-seepage, and pollution proof.
Indoor and outdoor stone engineering: stone floor/wall joint filling, edge finishing, and beautiful joints; Window sills, door frames, washbasins, stone and wall/glass/metal joints are sealed.
Ceramic/Tile Engineering: External wall ceramic panels, large-sized tile joint filling and waterproof sealing.
Composite joint: sealing the connection between different materials such as stone and glass, aluminum veneer, and metal frame.
3、 Typical technical parameters (reference values)
Appearance: Paste like, commonly white, gray, black, beige (can be customized with similar colors of stone).
Density: approximately 1.0-1.1 g/cm ³.
Drying time: 30-60 minutes (25 ℃, 50% RH).
Fully cured: 2-3 mm/24 hours, reaching optimal strength in 7 days.
Hardness (Shore A): 25-40.
Tensile strength: ≥ 0.8 MPa.
Displacement capability: ± 25% (level 25)/± 35% (level 35).
Pollution: The stone is pollution-free (tested by ASTM C1250).
4、 Construction points (avoiding pits)
Substrate treatment: The joints must be dry, clean, oil-free, and dust-free; The surface of the stone should be dry at least 4 ℃ to avoid damp construction.
Construction environment: temperature 5 ℃~45 ℃, humidity 40%~70%; Use with caution on rainy days/condensation/confined spaces.
Glue application and finishing: The glue seam is full and without bubbles; Trim the scraper before drying to maintain its aesthetic appearance.
Maintenance: Avoid contact with water, heavy pressure, and pollution within 24 hours; Avoid severe stretching and contraction within 7 days.
Taboo:
❌ Not suitable for structural bonding (such as dry hanging stress points), only for sealing and waterproofing.
❌ Not suitable for copper/copper alloys, oily substrates, and continuous immersion in water (such as swimming pools).
❌ Do not mix with acidic adhesive as it may cause poor curing and contamination.
5、 Common Brands and Selection Suggestions
International brands: Dow Corning SJ-169, Saint Gobain CE180 (preferred for high-end curtain walls, 10-year warranty).
Domestic brands: Antai 195, Jitai, Baiyun (high cost-effectiveness, commonly used in engineering).
Selection formula: Neutral stone must be selected, pollution prevention is prioritized, displacement level 35 is more stable, weather resistant for outdoor use, and beautiful color matching for indoor use.
6、 Difference from ordinary neutral adhesive/acidic adhesive
Ordinary neutral adhesive: may contain low molecular weight oil, which can easily contaminate stone materials; Displacement ability * * ± 20% * *, insufficient elasticity.
Acidic glass adhesive: Acidic corrosion of stone/metal, release of pungent odor, absolutely prohibited for use on stone.
Stone specific neutral adhesive: zero pollution, no corrosion, high elasticity, strong weather resistance, the only safe choice for stone engineering.
summary
Neutral silicone sealant for stone is a standard material for high-end stone engineering, with core values of anti pollution, non corrosion, high elasticity, and long weather resistance. It solves the pollution and aging pain points of ordinary adhesives, ensuring the beauty, waterproofing, and durability of stone decoration.
