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When the job demands permanent structural integrity, you need a bond that outperforms the substrate itself. Whether it is anchoring steel to concrete, joining heavy structural timber, or repairing elements in harsh marine conditions, Megapoxy 69 delivers. This translucent, non-sag epoxy gel is engineered for critical, high-impact applications where long-term durability is paramount.
Megapoxy 69 was developed for heavy-duty structural bonding and repair. It is a translucent, non-sag epoxy gel that forms permanent, impact-resistant bonds. Its formulation is specifically designed to handle high-stress applications, outperforming the strength of concrete and maintaining integrity even in challenging marine environments.
This epoxy delivers an ultimate compressive strength of 120 MPa, significantly exceeding the strength of most concrete it bonds to. For concrete specifically, it achieves a bond strength greater than 3 MPa, meaning the concrete itself will fail before the bond does. On steel, it offers a tensile bond strength of 19 MPa and a tensile lap shear strength of 17 MPa (steel to steel). This ensures structural connections can withstand significant dynamic loads and impact forces.
With a work time of 45 minutes at 25°C, it allows ample time for precise placement and assembly of complex structural elements, while still achieving minimum cure in 24 hours at 25°C for project progression.
Megapoxy 69 features a creamy, non-sag gel consistency, making it easy to apply on vertical or overhead surfaces without slumping. It uses a straightforward 1:1 mixing ratio by volume. Precise measurement and thorough mixing of Part A and Part B are critical to achieve the stated physical properties and prevent cure issues.
For maximum adhesion, meticulous surface preparation is essential. Concrete surfaces require mechanical abrasion like scabbling, grit blasting, or grinding to remove laitance. If this is not possible, acid etching and thorough washing are necessary. Metal surfaces must be grit blasted to AS 1627.2.2002 or mechanically abraded to a clean, bright finish, then degreased. Remove all existing coatings for optimal performance. Clean mixing implements and tools using Megapoxy Thinners after use.
Megapoxy 69 is engineered specifically for critical, heavy-duty structural bonding and repair. It stands out with its non-sag application, exceptional impact resistance, and durability in marine environments. When compared to other Megapoxy structural epoxies like Megapoxy PM Adhesive, PF, P1, or HT, Megapoxy 69 excels where the application demands a thixotropic gel that withstands extreme mechanical stress and prolonged exposure to harsh conditions. Other Megapoxy formulations might offer faster cure times, pourable consistencies, or specialised high-temperature resistance, but they do not combine 69's specific balance of non-sag workability, ultimate strength, impact resistance, and marine-grade performance.
Yes, Megapoxy 69 is specifically designed for structural bonding and repairs in civil engineering. It achieves an ultimate compressive strength of 120MPa and a bond strength to concrete of over 3MPa, making it suitable for demanding applications like concrete column repair and infills.
Yes, Megapoxy 69 is a non-sag gel. This creamy texture allows for effective application on vertical surfaces and overhead without slumping, maintaining consistent bond lines and fill volume.
For optimal adhesion on metal, grit blasting to AS 1627.2.2002 is recommended. If grit blasting is not possible, mechanically abrade the surface to a clean, bright metal, then degrease thoroughly. Wire brushing alone is not sufficient and yields minimal adhesion.
No, for the documented high bond strengths, all existing coatings, paint, or galvanizing must be completely removed. Bonding directly to prepared substrates ensures superior and reliable performance.
| Application | Key benefit | Primary trades |
|---|---|---|
| Structural bonding of metals (steel, aluminium) | Achieves high tensile lap shear strengths (17MPa steel-to-steel, 14MPa aluminium-to-aluminium) for permanent, load-bearing connections. | Structural fabricators, civil engineers, marine builders |
| Bonding concrete to concrete or masonry | Develops bond strength over 3MPa to concrete, superior to the concrete's tensile strength, for robust repair and connection. | Civil engineers, concrete repair specialists, masonry contractors |
| Structural timber joinery | Forms very high strength permanent bonds capable of resisting repeated high impact forces in timber structures. | Joiners, timber framers, marine builders |
| Assembly of natural stone and fibreglass fabrications | Provides a strong, non-sag bond for granite, marble, and fibreglass, maintaining position on complex assemblies. | Stone masons, fibreglass fabricators, architectural fixers |
| Filling splits, cracks, knot holes, and voids in concrete/stone | The non-sag gel fills gaps effectively, providing structural integrity with 120MPa compressive strength. | Concrete repairers, stone restoration specialists |
| Marine environment applications | Retains high strength and offers excellent chemical resistance, ensuring durability in harsh marine conditions. | Marine builders, boat repairers |
Proper surface preparation is non-negotiable for achieving the specified bond strength. All substrates must be structurally sound, clean, dry, and free of any contaminants.
Mechanically abrade by grinding or scabbling to remove laitance and expose a clean surface. Remove all dust.
Grit blast or grind to a bright metal finish, then immediately solvent wipe with an industrial degreaser to remove all residues.
Combine Part A and Part B in a 1:1 ratio by volume. It is essential that this ratio is measured accurately.
Mix thoroughly with a spatula or mechanical mixer until a uniform, light yellow colour is achieved. Pay close attention to scraping the sides and bottom of the mixing container to ensure all material is fully combined. Poor mixing will result in a weak bond and may prevent the product from curing correctly.
Apply the mixed gel to the prepared surfaces using a trowel or spatula. For bonding applications, press the surfaces firmly together to ensure full contact. For repairs, work the material into the void to eliminate air pockets.
DANGER: Megapoxy 69 is a Scheduled Poison (S5. Caution). Part A is classified as a Class 9 Miscellaneous Dangerous Good for transport.
Wear safety shoes, nitrile rubber gloves, and safety glasses. Wear protective clothing and suitable respiratory protection where vapours or mists are generated. Ensure eyewash stations and safety showers are readily accessible.
Natural ventilation is adequate under normal use conditions. Avoid breathing dust, fumes, or vapours.
Store in a cool, dry, well-ventilated place, out of direct sunlight and away from foodstuffs, incompatible materials (oxidising agents), heat, and ignition sources. Keep containers upright and closed when not in use. Dispose of contents and containers in accordance with local, regional, national, and international regulations. Contaminated work clothing should not leave the workplace.
Proper surface preparation is fundamental for Megapoxy 69 to achieve its documented high bond strengths and ensure long-term performance.
Surface prep: Ensure the concrete is free from grease, oil, and surface laitance. Laitance removal is best achieved through mechanical abrasion such as scabbling, grit blasting, or grinding. If mechanical methods are not feasible, acid etching can be performed using a 1:1 hydrochloric acid to water solution applied at 0.5 L/m², allowed to react for 10 minutes, then thoroughly washed and scrubbed. For maximum adhesion, the concrete must be surface dry before application. For painted concrete, flame-cleaning or scutching to remove paint, followed by diamond grinding or scabbling, is required.
Primer: Not required.
Surface prep: Metals must be grit blasted to AS 1627.2.2002 for optimal results. Alternatively, mechanically abrade the surface to a clean, bright metal finish. Degrease the surface thoroughly after abrasion. Wire brushing is not adequate for achieving sufficient adhesion. For painted or galvanised metals, remove all coatings using a good quality paint stripper, then follow with grit blasting or grinding to a bright metal finish.
Primer: Not required.
| Property | Value |
|---|---|
| Mixing Ratio By Volume | 1 Part A to 1 Part B |
| Work Time at 25°C | 45 minutes |
| Minimum Cure Time at 15°C | 48 hours |
| Minimum Cure Time at 25°C | 24 hours |
| Minimum Cure Time at 35°C | 12 hours |
| Minimum Application Temperature | 10°C |
| Appearance Mixed | Light Yellow |
| Ultimate Compressive Strength (ASTM C579) | 120 MPa |
| Bond Strength Concrete (ASTM D4541) | >3 MPa |
| Tensile Bond Strength Steel (ASTM D897) | 19 MPa |
| Modulus of Elasticity (ASTM C579) | 1 GPa |
| Flexural Strength (ASTM D790-18) | 66 MPa |
| Tensile Strength (ASTM D638-22) | 31 MPa |
| Tensile Lap Shear Strength (Steel to Steel) (ASTM D1002-00) | 17 MPa |
| Tensile Lap Shear Strength (Steel to Aluminium) (ASTM D1002-00) | 16 MPa |
| Tensile Lap Shear Strength (Aluminium to Aluminium) (ASTM D1002-00) | 14 MPa |
| Hardness (Shore D) (ASTM D2240-00) | 70 |
| Dielectric Strength | 10.7 kV/mm |
| Surface Resistivity (ASTM D257) | 10^12 Ohm |
| Volume Resistivity | 2.81 x 10^11 Ohm.cm |
| VOC (ASTM D3960) | 3 g/l |
| Part A Colour | White |
| Part B Colour | Light Yellow |
| Part A Specific Gravity (25°C) | 1.05-1.15 |
| Part B Specific Gravity (25°C) | 0.94-0.98 |
| Flash Point | >200°C |
Here are some common examples on where Megapoxy 69 used by our customers.
