Performance Characteristics:
•One-component, room-temperature curing: Easy to use with no mixing required; cures upon exposure to atmospheric moisture.
•Excellent adhesion: Offers reliable bonding performance to multiple construction substrates including glass, ceramics, wood and metals.
•Superior durability: Cures into tough, elastic silicone rubber that retains stable performance from -40℃ to 150℃, resisting cracking and chalking.
•Waterproof, seismic and impact resistant: Delivers outstanding waterproof property together with great seismic and shock resistance.
•Thixotropic: Features good thixotropy and sag resistance for convenient application.
SMT 898 is a one-component, acid-cure silicone sealant with fast room-temperature curing, high modulus and low movement capability. It is a high-performance acid silicone sealant, non-corrosive to most substrates and boasts excellent adhesion, flexibility, waterproof performance, wide temperature resistance and long-term durability. It is suitable for architectural glass, doors & windows, shop windows, display cabinets, aquariums and various other building materials.
Application Areas
- Bonding of aquariums and glass water tanks
- Structural engineering for large glass panels and skylight glass
- Joint sealing for uncoated glass curtain walls, suspended glass structural assembly systems and point-supported curtain walls
- Bonding and sealing for conventional elevators and sightseeing elevators
- Assembly or sealing of high-end doors, windows and commercial display cabinets
- Bonding, waterproof sealing for other indoor and outdoor building products and industrial components.
Package
- This product is supplied in standard 300ml sealant cartridges, 24 cartridges per carton. Custom filling is available per customer requirements.
| Test Items | Technical requirements | Typical Data | Test Method | |
|---|---|---|---|---|
| Appearance | It is a smooth and uniform paste or viscous fluid, free of bubbles, skinning and gel lumps, without undispersible precipitates. | It is a smooth and uniform paste or viscous fluid, free of bubbles, skinning and gel lumps, without undispersible precipitates. | Visual inspection | |
| Density, g/cm³ | 0.99±0.03 | 0.99 | GB/T 13477.2-2018 | |
| Sag Resistance | vertical, mm | ≤3 | 0 | GB/T 13477.6-2002 |
| Horizontal | No deformation | No deformation | ||
| Tack-free time, min | ≤20 | 20 | GB/T 13477.5-2002 | |
| Extrudability, g/5s | ≥20 (Nozzle tip diameter: φ3.2 mm, operating pressure: 0.24 MPa) | 34 | GB/T 13477.3-2017 | |
| Cure rate, mm/24h | ≥1.0 | 3.0 | GB/T 13477.22 | |
| Elongation at Break, % | ≥500 | 510 | GB/T 528-2009 | |
| Tensile Strength, Mpa | ≥1.4 | 1.8 | GB/T 528-2009 | |
| Hardness, Shore A | 20-30 | 28 | GB/T 39693.4-2025 | |
Before application:
- Prior to application, compatibility tests between the sealant and contacting materials as well as adhesion tests on the substrates to be bonded shall be carried out.
Construction Method:
- All application surfaces must be clean, dry and free of contaminants.
- Fit the cartridge into a suitable caulking gun. Cut the nozzle according to joint width, then extrude sealant into the joint to ensure full contact between sealant and joint edges.
- Compact the sealant with a proper tool and scrape off excess material.
- Structural assembly, secondary sealing of insulating glass, hidden frame curtain walls.
- Not recommended for joints with movement exceeding ±25%.
- Direct contact with the reflective coating layer of mirrors is prohibited.
- Not suitable for areas with continuous water immersion or permanently humid environments.
- Not applicable to corrosive or hard-to-bond substrates such as copper, brass, zinc, magnesium, electroplated coatings, polycarbonate, polyethylene and Teflon.
- Unsuitable for alkaline substrates including cement, stone and concrete (risk of fogging and oil bleeding).
- Shall not be used for underground joints or food-contact surfaces.
- Application is forbidden when the substrate surface temperature is lower than 5℃ or higher than 40℃.
- Not suitable for materials releasing grease, plasticizers or solvents, e.g. surfaces of oil-impregnated wood.
- Must not be used as structural glazing sealant.
- Avoid contact with rubber materials (rubber gaskets, rubber spacers, etc.).
- The substrate surface for construction must be clean, dry and free of contaminants.
- Use within the shelf life; expired product is forbidden for use.
- Construction shall be implemented strictly in accordance with adhesion test procedures.
- Avoid direct contact with skin and eyes; do not ingest.
- Keep away from children and store out of their reach.
- Trace chemicals will be released during curing. Sufficient ventilation must be maintained at the working site. The fully cured product is non-toxic to human beings.
