Fosroc Nitobond SBR

Product Overview

Nitobond SBR is a modified styrene-butadiene rubber emulsion supplied as a ready-to-use white liquid. It is designed to improve the quality of site-batched cementitious mortars and slurries. Resistant to hydrolysis, it is suitable for both internal and external applications. When added to cement mortars, it improves cohesion and workability, provides waterproof repairs, renders and toppings with high freeze-thaw resistance. Improved tensile and flexural properties allow thin-layer applications. It provides excellent bond to concrete, masonry, stonework, plaster, and blockboard.

Key Features

• Multi-purpose — Usable as repair mortar additive, bonding slurry primer, render modifier, and tile bonding mortar
• Enhanced bond strength — Excellent adhesion to concrete, masonry, stonework, plaster, and blockboard
• Waterproofing — Significantly reduces mortar water absorption and permeability
• Freeze-thaw resistant — Modified mortars are highly resistant to freeze-thaw cycling
• Thin-layer application — Improved tensile and flexural properties enable thin applications
• Improved workability — Enhances mortar cohesion and handling characteristics
• Chloride-free — Contains no chloride admixtures
• Potable water approved — WRAS approved for potable water contact, passed BS 6920 water quality test (per manufacturer)
• Single-component liquid — Easily measured and added as needed

Applications

• Concrete repair mortars (patching and repair)
• Heavy-duty floor toppings and screeds
• Waterproof renders and cementitious slurries
• Bonding mortar for ceramic tiles, slip bricks, and decorative cladding
• Spatterdash for bonding render and plaster
• Bonding slurry primer for the Renderoc repair system

Packaging

20L drums.

Important Notes

• Not suitable for application when temperature is low and falling
• Must not be exposed to running water during application; heavy rain before final set may cause surface scour
• Modified mortars must be cured immediately after finishing in accordance with good concrete practice
• Bonding slurry primer must not dry before repair mortar application; remove and re-prime if dried
• Protect from frost during storage
• Shelf life is twelve months in unopened packs
• Alkaline when mixed with cement — wear gloves, goggles, and protective clothing
• For detailed application methods, mix designs, and technical parameters, please refer to the official product data sheet

FAQ

How does Nitobond SBR differ from other SBR products on the market?

Nitobond SBR is manufactured by Fosroc with consistent quality control and has been tested and approved for potable water contact under the WRAS scheme and BS 6920 water quality testing (per manufacturer). Market SBR products vary widely in quality. Choosing a reputable manufacturer's product ensures consistent construction quality and durability.

Can Nitobond SBR be used directly as a bonding agent?

Nitobond SBR should not be used directly. The correct method is to mix it with water and cement to create a slurry primer, apply this to a pre-soaked substrate, and then apply repair mortar while the slurry is still wet. For a ready-to-use bonding agent, consider Nitobond AR instead.