Conbextra EP935: Epoxy Grout for Underwater Applications

Product Overview

Conbextra EP935 is a specialized two-component, finely filled, low viscosity epoxy resin grout engineered specifically for underwater grouting applications and repair of water-immersed concrete structures. The product combines high performance with water-displacement capabilities, making it uniquely suited for challenging submerged environments where conventional grout systems may prove ineffective.

Key Technical Specifications

Physical Properties

Mixed Specific Gravity: Approximately 2.0, providing high density for effective water displacement in submerged conditions.

Supply Format: Conbextra EP935 is supplied as a two-component pre-measured pack designed for whole pack mixing to ensure consistent flow and mechanical properties. The product comes in 15 kg (8.4 litre) pre-weighed packs with a minimum order quantity of 63 units.

Compressive Strength

The product demonstrates strong compressive strength performance:

• 50 MPa at 24 hours
• 90 MPa at 7 days

These values indicate excellent early strength development, critical for underwater applications where rapid strength gain is beneficial.

Shelf Life and Storage

Conbextra EP935 is a base component product with a shelf life of 36 months from date of manufacture when stored in dry conditions within original, unopened packs. Proper storage is essential to maintain product performance and reliability.

Product Composition and Design

Two-Component System

The product features:

• Pre-measured components for consistent mixing ratios
• Fine filler composition enabling penetration and bonding in concrete elements submerged in water
• Low viscosity formulation optimized for underwater placement and flow characteristics

Formulation Advantages

The finely filled, low viscosity composition provides several technical benefits:

• Effective penetration into concrete pores when submerged
• Superior bonding to water-immersed concrete surfaces
• Reliable performance in demanding aquatic environments
• High density ensuring complete water displacement during placement

Primary Applications

Underwater Grouting

Conbextra EP935 is specifically designed for underwater grouting work, where wash-out resistance and water-displacement properties are critical performance requirements.

Water-Immersed Concrete Repair

The product is suitable for repair of water-immersed concrete structures, enabling durable restoration in:

• Submerged structural elements
• Tidal zone applications
• Permanently flooded conditions

Underplate Grouting

Placement thickness range: 12 mm to 30 mm in a single pour when used as underplate grout, with product volumes managed according to structural requirements.

Manufacturer and Distribution

Conbextra EP935 is manufactured by Fosroc and distributed through authorized channels including Parchem Construction Supplies Pty Ltd, which operates under license from Fosroc International Limited in Australia and New Zealand.

Regulatory Compliance and Documentation

A Safety Data Sheet (SDS) and Technical Data Sheet (TDS) are available from the Fosroc website. Users are advised to review these documents carefully prior to product use, as application and performance data may be subject to change.

References

• [1] Fosroc_Conbextra_EP120_Plus_TDS.pdf
• [2] Fosroc_Conbextra_HES_TDS.pdf
• [3] Fosroc_Conbextra_EP65_Plus_TDS.pdf
• [4] Fosroc_Conbextra_EP65_Plus_Underwater_TDS.pdf