When a structural bond must hold, even under extreme impact or in persistent moisture, Megapoxy 69 provides the reliability needed. It handles critical connections between concrete, metal, timber, and stone with a strength that lasts. This product ensures structural integrity for jobs demanding unwavering performance, whether onshore or in marine environments.

Why this product exists

Megapoxy 69 is an epoxy structural adhesive formulated for heavy-duty applications where permanent, impact-resistant bonds are essential. Its non-sag gel consistency allows for effective use on vertical or overhead surfaces without slumping. Engineered for superior adhesion across diverse materials, it is ideal for civil engineering, marine construction, and structural timber applications. It also features very low VOC content, supporting healthier working conditions.

The numbers that matter

  • Bond strength to concrete: >3 MPa (ASTM D4541): This exceeds the typical tensile strength of concrete itself. The adhesive will not be the point of failure, ensuring the bond is stronger than the substrate it connects.
  • Ultimate compressive strength: 120 MPa: This high compressive strength means Megapoxy 69 can withstand significant direct pressure, making it suitable for load-bearing repairs and infills in concrete and masonry structures.
  • Tensile lap shear strength (steel to steel): 17 MPa: This value demonstrates the product's ability to create robust, load-transferring bonds between metal components, crucial for structural steel fabrication and repair.
  • Non-sag gel with 45-minute work time at 25°C: The gel consistency prevents material slump on vertical or overhead applications, while the extended work time allows for precise positioning and assembly of complex or large components before initial cure begins.

What it's like to use

Megapoxy 69 uses a simple 1:1 mix ratio by volume. It is critical to measure and mix both Part A and Part B thoroughly to ensure full cure and achieve the specified physical properties. Inaccurate mixing can lead to discolouration, incomplete curing, and reduced performance. The minimum application temperature is 10°C, and cure times vary significantly with temperature, ranging from 12 hours at 35°C to 48 hours at 15°C. For tool cleaning, use Megapoxy Thinners.

Surface preparation is paramount for optimal adhesion. Concrete substrates require mechanical abrasion such as scabbling, grit blasting, or grinding to remove laitance and create a sound profile. Acid etching is an alternative if mechanical methods are not possible, followed by thorough washing and 24 hours of drying. Metal surfaces must be grit blasted to AS 1627.2.2002 or mechanically abraded to bright metal, then degreased. All existing coatings must be removed for maximum bond strength. Always ensure substrates are dry.

Where this product excels

  • Civil Construction: For structural repairs and bonding of concrete and masonry, including infills, crack filling, and joining precast elements where a bond stronger than the concrete itself is required.
  • Marine Environments: Ideal for bonding and repairing components in boats, docks, and other marine structures, offering high strength retention and chemical resistance even in harsh saltwater conditions.
  • Structural Timber Joinery: Provides permanent, impact-resistant bonds for heavy timber construction, ensuring the long-term stability and integrity of critical joints.
  • Stone and Metal Fabrication: Used for the assembly of natural stone (granite, marble) and bonding various metals (steel, aluminium), including fibreglass components, where a non-sag, high-strength adhesive is necessary to hold materials in place during cure.

Choose this when

  • When creating structural bonds between dissimilar materials like metal, concrete, timber, or stone.
  • When the application demands extreme strength, impact resistance, and durability in marine or high-stress environments.
  • When working on vertical or overhead surfaces where a non-sag, paste-like adhesive is required to maintain position.
  • When the bond strength must surpass that of the substrate itself, such as bonding concrete to concrete.

Don't use this when

  • Not for: Rapid-cure applications. Megapoxy 69 requires dedicated cure times dependent on temperature; it is not for immediate service.
  • Not for: Unprepared or coated substrates. Achieving full bond strength requires meticulous surface preparation, including mechanical abrasion or grit blasting, and removal of all existing coatings.
  • Not for: General-purpose, non-structural adhesion. This product is engineered for critical structural applications; using it for non-load-bearing, low-stress bonds may be overkill and less efficient.
  • Not for: Bonding to damp or wet surfaces. Optimal adhesion requires completely dry substrates.

Megapoxy 69 versus other Megapoxy P-Series epoxies

Megapoxy 69 is engineered for critical, heavy-duty structural bonding and repair requiring exceptional strength, impact resistance, and marine durability with a non-sag application. While other Megapoxy P-series products like Megapoxy PM, PF, P1, and HT offer robust epoxy solutions, Megapoxy 69 distinguishes itself when the project specifically demands superior structural performance under impact, in harsh marine conditions, and where a highly thixotropic, non-sag paste is essential for vertical or overhead work. It is formulated to create bonds that are often stronger than the materials they join, making it the choice for demanding structural integrity where fast cure or more general-purpose bonding might be insufficient.