Fosroc Conbextra GP

Product Overview

Conbextra GP is a general-purpose non-shrink cementitious grout supplied as a ready-to-use dry powder. Adding a controlled amount of clean water produces a flowing non-shrink grout. The product is a blend of Portland cement, graded fillers, and chemical additives that impart controlled expansion in the plastic state while minimising water demand. The low water demand ensures high early strength development, while the graded filler assists uniform mixing and produces a consistent grout. It can be mixed to trowellable, flowable, or anchoring consistency as required.

Key Features

• Shrinkage and settlement compensation — Gaseous expansion system compensates for shrinkage and settlement in the plastic state
• Iron-free — No metallic iron content to corrode and cause staining
• Pre-packaged — Overcomes on-site batching variations for consistent quality
• High early strength — Develops high early strength without the use of chlorides
• High ultimate strength and low permeability — Ensures durability of the hardened grout
• Chloride-free — Will not affect reinforcement
• Versatile consistency — Can be mixed to trowellable, flowable, or anchoring consistency

Applications

• Machine base plate grouting (e.g. stanchion base plates)
• Anchoring starter bars, masts, and anchor bolts
• Minor concrete defect repair in new construction
• General non-shrink grouting applications

Packaging

25KG moisture-resistant bags.

Important Notes

• Use warm water in low-temperature conditions to accelerate strength development
• Use cool water in high-temperature conditions
• Place grout promptly after mixing to gain full benefit of the expansion process
• Pour from one side continuously to prevent air or water becoming trapped under the base plate
• Exposed grout surfaces must be properly cured
• Shelf life is nine months in dry storage in original unopened bags
• Product is alkaline — wear gloves, goggles, and dust masks during application
• For detailed application methods, coverage rates, and technical parameters, please refer to the official product data sheet

FAQ

What is the difference between Conbextra GP and Conbextra HF?

Both are non-shrink cementitious grouts. GP is a general-purpose grade for standard grouting needs. HF is a high-flow grade with greater fluidity, suited for long-distance flow or narrow-gap grouting. Choose based on the flow requirements of your project.

Can Conbextra GP be used for anchoring reinforcement?

Yes. Conbextra GP is suitable for anchoring starter bars, masts, and anchor bolts. Drill holes should have rough internal surfaces and be cleaned of dust, then pre-soaked with water before grouting. Deformed bars should be used to ensure good bond between bar and grout.