The Bond-It SBR Admixture is a high-performance styrene butadiene rubber (SBR) polymer latex designed to enhance the flexibility, adhesion, and durability of cementitious mortars, renders, screeds, and overlays. Ideal as a bonding primer or additive, this SBR admixture improves water resistance, reduces shrinkage/cracking, and ensures strong bonding between old and new concrete surfaces, even in demanding environments.
Use Bond-It SBR Admixture for:
When used correctly, Bond-It SBR transforms traditional cementitious mortars into high-performance polymer-modified mixes. In flooring systems with underfloor heating or multi-layer concrete builds (like yours), it creates a polymer-rich interface layer that helps absorb movement, ensures durable bonding, and mitigates cracking or delamination under thermal cycling. It bridges the gap between structural demands and surface finishes — making your installation more reliable over time.
It is a styrene butadiene rubber (SBR) polymer latex, designed to improve the performance of cement-based mortars, renders, screeds, and overlays by increasing adhesion, flexibility, water resistance, and durability.
Dilute it with clean water (typical ratio 1:1, but always check the data sheet). Apply by brush or roller onto a clean, dust-free substrate (such as SEM Floor C20 or concrete). Wait until the film is tacky (not fully dry), then apply your tile adhesive or mortar over it.
Yes, Bond-It SBR can be added into the mixing water for mortars, renders, or screeds to create a polymer-modified mix. This enhances flexibility, adhesion, and reduces cracking. Always follow the manufacturer’s recommended dosage.
✅ Yes — one of its strengths is imparting flexibility and resistance to thermal movement. This makes it particularly suitable in floor systems that include underfloor heating.
Yes. In your layered system, using SBR as a primer on SEM Floor C20 helps create a strong, durable interface for Bond-It CTA Flexible (or another tile adhesive) to bond reliably without delamination or failure under thermal stress.
Yes. The polymer reduces internal shrinkage, limits micro-cracking, and improves cohesion of cementitious layers.
✅ Once cured, the SBR-modified layer offers improved water resistance, reduced permeability, and durability in wet or exterior environments.
Use it on concrete, cement screeds, SEM Floor C20, renders, repair mortars, and existing sound masonry surfaces. Avoid applying over loose, contaminated, or unstable surfaces.
Typically you wait until the primer film is tacky (not fully dry). The exact time depends on ambient conditions (temperature, humidity). Always refer to the technical data sheet.
Store in a cool, frost-free, dry environment, in tightly sealed containers. Use within the stated shelf life (commonly 12 months, but check batch data) for best results.
A mortar incorporating a polymer additive (like SBR) to enhance flexibility, adhesion, durability, and resistance to cracking and water ingress — ideal under heating or movement.
A primer helps ensure a strong bond by controlling substrate absorption, improving adhesion, and bridging any micro-porosity or dust. In heated or layered systems, it also helps manage movement stresses.
SBR is excellent for many floor and tile systems, especially where movement is moderate. But for high structural stresses, heavy loads, or extreme movement, a two-part epoxy or PU adhesive may still offer superior mechanical strength.
Use it as a primer over SEM Floor C20 or concrete; then apply CTA Flexible on top. The SBR layer enhances bond, flexibility, and durability under thermal cycling, reducing risk of delamination.
Yes, when properly applied and protected, SBR-modified layers offer good resistance to moisture and weather. Always ensure correct surface prep and follow technical guidelines.
