Sika®SBR 200

Sika® SBR 200 is a high-performance, multipurpose bonding agent and admixture that is typically used to improve the properties of cement-based materials. It is a styrene-butadiene rubber (SBR)-based liquid that enhances the strength, flexibility, and adhesion of construction mixes. Here’s an overview of its usage, applications, coverage, and advantages:

Usage of Sika® SBR 200:

• Bonding Agent: Used to improve the bond between new and old concrete or mortar surfaces, as well as between substrates and coatings.
• Admixture for Concrete and Mortar: Incorporated into concrete, cement, and mortar mixes to improve adhesion, flexibility, water resistance, and durability.
• Surface Treatment: Applied as a bonding primer or surface treatment for masonry, concrete, and brickwork, especially where strong adhesion is required for finishes or toppings.
• Flexibility Enhancer: Provides enhanced flexibility and crack resistance to cement-based materials, making them more suitable for applications subject to thermal expansion, shrinkage, or movement.
• Waterproofing Enhancer: Can be used to improve the water resistance of cement-based materials, making them suitable for waterproofing applications.

Applications of Sika® SBR 200:

1. Concrete Repairs: Used in repair mortars, ensuring strong bonding between old and new concrete and improving the performance of repair materials.
2. Waterproofing: Added to cementitious waterproofing mixes to improve water resistance, ideal for areas exposed to water pressure or moisture, such as basements, swimming pools, and underground structures.
3. Tiling Adhesives: Used in the preparation of tile adhesives for improved adhesion to substrates like concrete, brick, and ceramic surfaces.
4. Rendering and Plastering: Added to plaster and render mixes to improve adhesion, workability, and resistance to cracking, especially on difficult substrates like old concrete or masonry.
5. Mortar for Bonding: Enhances the bonding of mortar to substrates like concrete, stone, and brick, particularly for applications where strong adhesion is needed.
6. Patching and Resurfacing: Used in patching and resurfacing applications to improve the performance of the mix, increasing its workability, strength, and durability.
7. Repairing Cracks in Concrete: When mixed with repair compounds, it enhances the crack-bridging properties and helps the material resist further cracking.
8. Cement-Based Adhesive Mixes: Used in the preparation of cement-based adhesives for fixing tiles and other materials, especially in challenging environments.

Coverage of Sika® SBR 200:

• Mixing Ratio: Typically, Sika® SBR 200 is mixed with cementitious materials in a ratio of 1 part Sika® SBR 200 to 3-5 parts water for general applications. The exact ratio depends on the specific application and required properties.
• Bonding Agent: As a bonding agent, it is usually applied in a diluted form with water, covering approximately 5–10 m² per liter (depending on the substrate and surface texture).
• Admixture in Mortar and Concrete: When used as an admixture in concrete or mortar mixes, it generally accounts for 5–10% of the total weight of the cement.
• Surface Treatment: When used as a bonding primer for substrates, coverage can range from 6–10 m² per liter, depending on the porosity and texture of the surface.

Note: Actual coverage rates may vary based on surface conditions, application methods, and the specific mix design.

Advantages of Sika® SBR 200:

1. Improved Bonding: Enhances the bond between new and old concrete, mortar, or render, ensuring strong adhesion even on difficult surfaces.
2. Enhanced Durability: Improves the durability of concrete, mortar, and renders by making them more resistant to wear, cracking, and thermal expansion.
3. Increased Flexibility: Adds flexibility to cement-based mixes, making them more resistant to cracking due to shrinkage, temperature fluctuations, and mechanical movement.
4. Water Resistance: Enhances the water resistance of cement-based materials, making them suitable for waterproofing and applications exposed to moisture or water pressure.
5. Crack Resistance: Improves the crack-bridging properties of mortars and repair materials, ensuring long-lasting, effective repairs.
6. Improved Workability: Increases the workability and ease of application of cementitious mixes, making them easier to spread, smooth, and finish.
7. Versatile: Can be used in a wide range of applications, including bonding, waterproofing, repair work, rendering, and tiling, making it a versatile addition to construction projects.
8. Easy to Use: Simple to mix and apply, either as an additive to mortar and concrete or as a bonding agent for surfaces.
9. Environmental Benefits: Being water-based, Sika® SBR 200 is low in VOCs (volatile organic compounds), making it a safer and more environmentally friendly choice for construction applications.
10. Enhanced Adhesion to Difficult Substrates: Provides excellent adhesion to difficult surfaces such as old concrete, dry or dusty masonry, and porous substrates.
11. Cost-Effective: Improves the performance of basic mortar and concrete mixes, reducing the need for expensive, specialized materials, and providing cost savings in the long term.