Sika SikaTop-300 Seal
Sika SikaTop-300 Seal
SikaTop®-300 Seal is a 2-component, polymer-modified, highly elastic cementitious waterproofing slurry with excellent crack-bridging capability (~250% elongation at break). Suitable for terraces, balconies, wet areas and window frame surroundings. Features frost/salt resistance to -10°C, anti-carbonation protection, low VOC and non-toxic formulation.
SikaTop-300 Seal — Highly Elastic Cementitious Waterproofing Slurry
SikaTop®-300 Seal is a 2-component, polymer-modified, highly elastic cementitious waterproofing coating. Component A is a liquid polymer with additives and Component B is Portland Cement with selected aggregates. It is applied to concrete and mortar substrates as an elastic waterproofing coating to prevent water infiltration, with excellent crack-bridging capability for areas subject to movement.
Key Features
- Highly elastic with good crack-bridging capability (~250% elongation at break)
- Pre-batched components with consistent quality
- Easily applied by roller or brush
- Good adhesion to sound substrates
- Cementitious with low VOC — non-regulated under Hong Kong Air Pollution Control regulations
- Impermeable — 0 mm water penetration at 50 m head of water
- Increased frost and salt resistance — resistant to freezing and thawing to -10°C
- Decreases carbon dioxide penetration (anti-carbonation)
- Non-toxic, same as cement
Applications
- Waterproofing — elastic waterproofing coating for concrete and mortar surfaces
- Crack sealing — sealing of hairline cracks and protective coating against aggressive elements
- Anti-carbonation — protective coating in concrete repair work against carbon dioxide penetration
- Terraces and balconies — exposed terrace and balcony waterproofing
- Wet areas — kitchens, bathrooms, showers and laundries
- Window frame surroundings — waterproof sealing around window frames
Why Choose SikaTop-300 Seal?
SikaTop-300 Seal is a high-elongation product in the Sika cementitious waterproofing range, ideal for applications requiring superior crack-bridging:
- High elasticity: ~250% elongation at break — effectively bridges cracks from thermal movement and structural settlement
- Frost and salt resistance: Resistant to freeze-thaw cycles down to -10°C, suitable for exposed applications
- Multi-function protection: Combines waterproofing, anti-carbonation and crack sealing in one product
- Sika brand: Swiss Sika — over 100 years of proven quality and reliability
- System compatibility: Works with Sika® SealTape F for enhanced waterproofing at joints and corners in wet areas
For other cementitious waterproofing options, browse our flexible cementitious waterproofing range.
Packaging
| Item | Specification |
|---|---|
| Packaging | 45 kg set (25 kg bag Part B + 20 kg pail Part A) |
| Shelf Life | 9 months from date of production (store in undamaged, unopened original sealed packaging in cool, dry conditions away from direct sunlight and frost) |
Technical Specifications
| Parameter | Value |
|---|---|
| Chemical Base | Part A: liquid polymer and additives; Part B: Portland Cement, selected aggregates |
| Appearance (Part A) | White liquid |
| Appearance (Part B) | Grey powder |
| Appearance (mixed) | Dark grey slurry |
| Density (wet mixed mortar) | Approx. 1.5 kg/l |
| Tensile Strength | ~1.32 MPa |
| Elongation at Break | ~250% (7 days cured) |
| Tensile Adhesion Strength | > 1 MPa |
| Water Penetration Under Pressure | 0 mm at 50 m head of water |
| Water Absorption | < 4.9 × 10⁻¹⁴ m/s |
| Consumption | Approx. 1 kg/m²/coat (min. 2 coats; for critical areas, apply a third coat) |
| Max. per layer | 2 kg/m² |
| Pot Life | ~80 minutes at +20°C (shortened at higher temperatures) |
| Curing Time | Minimum 3 days before water ponding test, then tiling or rendering |
| Initial Set Time | 0 ml/m²/sec |
| Freeze-Thaw Resistance | Resistant to freezing and thawing at -10°C |
Important Notes
- Minimum ambient and substrate temperature is 8°C for application
- Never apply more than 2 kg/m² per single layer
- Minimum 2 coats required; for critical areas, apply a third coat
- Substrate must be concrete or mortar — clean, sound, free from grease, oil and loosely adhering particles
- Steel and iron surfaces must be clean, free from scale, rust, grease and oil
- Absorbent surfaces must be thoroughly saturated with water prior to application — no standing water
- A bond coat using a mixture of Sika Latex and cement is recommended for better keying
- Mix using a slow speed mixer (~500 rpm) with uplifted notched disk paddle for approx. 3 minutes until lump-free
- Allow 2–4 hours at 25°C for the first coat to cure before applying following coats
- Additional stripe coat recommended over cracks, wall/floor intersections and locations subject to movement
- Sika® SealTape F recommended at joints and corners in wet areas for advanced water tightness
- Protect freshly applied material from direct sunlight, wind, rain and frost during curing
- Minimum 3 days curing before water ponding test or subsequent finishes
- Clean all tools with clean water immediately after use — hardened material can only be removed mechanically
- Non-regulated under Hong Kong Air Pollution Control (Volatile Organic Compounds) Regulation
FAQ
What is the difference between SikaTop-300 Seal and SikaTop-107 Seal?
SikaTop-300 Seal is a highly elastic waterproofing slurry with ~250% elongation at break, offering far greater crack-bridging capability than SikaTop-107 Seal. SikaTop-300 Seal is better suited for exposed environments (terraces, balconies) and substrates with greater movement. For general interior bathroom waterproofing, SikaTop-107 Seal HK is sufficient.
Can SikaTop-300 Seal be used for basement waterproofing?
SikaTop-300 Seal is primarily designed for terraces, balconies, wet areas and window frame surroundings. For basement waterproofing requirements, please WhatsApp us for suitable waterproofing solutions.
How is SikaTop-300 Seal applied?
Shake Component A (liquid) before use, pour into a clean mixing container, then slowly add Component B (powder) while mixing at low speed (~500 rpm) for approximately 3 minutes until creamy and lump-free. Apply the first coat to the pre-wetted surface by brush, roller or squeegee. Allow 2–4 hours curing at 25°C, then apply the second coat. Refer to the Sika product data sheet for detailed instructions.
What is the coverage of SikaTop-300 Seal?
Approx. 1 kg/m² per coat, with a maximum of 2 kg/m² per single layer and minimum 2 coats required. A 45 kg set covers approximately 22 m² (based on 2 coats). Actual coverage depends on substrate roughness and coating thickness.
How much does SikaTop-300 Seal cost?
Please WhatsApp us for the latest SikaTop-300 Seal pricing. We offer self-pickup from our Mong Kok store and Hong Kong delivery service.
