Sika SikaBond SBR + Waterproof Bonding Agent 25L for Concrete Brickwork 445916 (SIKASBR25)

Sika Sika SikaBond SBR + Waterproof Bonding Agent 25 Litre

Ref: SIKASBR25 | MPN: 892692 | Barcode: 5055492700537

SikaBond SBR 25 Litre is a water-based styrene-butadiene rubber emulsion designed to improve the performance of cementitious mixes through enhanced adhesion, workability, and waterproofing properties.

Who This Product Is For

This bonding agent is suitable for professional builders, tradespeople, and those undertaking renovation projects who require reliable performance in wet or damp conditions. It meets the needs of both commercial construction work and substantial home improvement tasks.

The product suits external applications where traditional PVA would be ineffective, particularly for work exposed to moisture or challenging weather conditions.

Key Features

• Enhanced adhesion for stronger bonding between surfaces
• Waterproof properties providing reliable moisture resistance
• Reduced shrinkage to minimise cracking and surface dusting
• Improved workability making cementitious mixes easier to handle
• Freeze/thaw resistance for performance in challenging weather conditions

Practical Applications

• External rendering and screeds for weather-resistant finishes
• Concrete repairs and brick slip installations
• Tile fixing mortars where improved adhesion and water resistance are required
• Abrasion resistance for floors and surfaces exposed to heavy use
• General bonding tasks including surfacing and renovations in demanding conditions

How This Fits Into a Typical Job

This bonding agent is used during surface preparation and mix modification stages. It functions as a primer when diluted for porous surfaces, or as an additive to cement mixes to improve their properties before application.

The product integrates into workflows where enhanced bonding and waterproofing are needed, particularly for external applications or in damp environments where traditional bonding methods may fail.

How to Use

1. Surface preparation: Ensure the application area is clean and free from debris
2. Dilution for priming: Mix 1 part SBR+ with 3 parts water for use as a primer on porous surfaces
3. Mixing for bonding: Combine 1 part SBR+ with 1–2 parts Portland cement to create a bonding slurry
4. Admixture preparation: Add 5–7 litres of SBR+ per 25kg of Portland cement, depending on desired consistency and application
5. Application: Apply the mixed solution using appropriate tools like brushes, trowels, or rollers, ensuring even coverage

Storage and Maintenance

• Keep the container sealed tightly when not in use to prevent contamination or drying out
• Store in a cool, dry place away from direct sunlight for maximum shelf life
• Clean tools immediately after use to avoid residue build-up

Not Suitable For

• Applications where traditional PVA would be sufficient in dry, interior conditions
• Use as a standalone adhesive without combining with cementitious materials
• Projects where the specific dilution or mixing ratios cannot be followed

Order SikaBond SBR for bonding, waterproofing, and flexibility in construction and renovation projects.

• Specification

  Weight	25 kg
  Reference Code	SIKASBR25
  Size	25 litre
  Manufacturer	Sika
  Type	SBR Bonding Agent
  Reference Code sika	892692

• Product FAQs

  Q: What makes this bonding agent different from PVA?
  A: Unlike PVA, this product performs exceptionally well in wet or damp conditions, making it suitable for outdoor applications where moisture resistance is critical.
  Q: Can it be used with all types of cement?
  A: Yes, it is compatible with most Portland cement-based mixes, enhancing their adhesion, workability, and durability.
  Q: How does it improve waterproofing?
  A: By creating a water-resistant barrier within cementitious mixes, it prevents moisture ingress, ensuring long-lasting protection for external surfaces.
  Q: Is this suitable for interior projects?
  A: Absolutely. While it excels in outdoor applications, it can also be used effectively indoors for tasks like tiled surfaces or floor repairs.
  Q: Does it require any special tools for application?
  A: No specialised tools are necessary. Standard construction tools like brushes, rollers, or trowels can be used for applying this product.
  Q: What is the recommended drying time?
  A: Drying time varies depending on the application thickness and environmental factors, but typically it takes 4–6 hours for the initial coat to set.

• Downloads

  Sika Sikabond SBR Safety Data Sheet
  Sika Sikabond SBR Technical Data Sheet