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Need to bond precast concrete articles, secure metal to concrete overhead, or repair concrete vertically without slump? When the job demands a strong, permanent bond that defies gravity and cures reliably, even in cold or damp conditions, Megapoxy 254 delivers.
Megapoxy 254 is a non-sag epoxy filling and adhesive paste designed for critical applications where conventional adhesives fail. It provides high-strength, permanent bonds and durable repairs on vertical and overhead surfaces, specifically formulated to cure effectively under challenging cold and damp conditions. This VOC-free formulation ensures a clean, reliable, and non-staining finish, making it suitable for sensitive materials like white or light-coloured natural stone and ceramics.
Megapoxy 254 offers exceptional mechanical strength. Its compressive strength of 70 MPa makes it stronger than most concrete, ideal for grouting bolts or repairing heavily loaded concrete structures. A tensile bond strength of 20 MPa to steel and greater than 3 MPa to concrete ensures robust, permanent connections between dissimilar materials. With a flexural strength of 38 MPa, it resists bending and cracking under significant load, providing durable, long-lasting repairs and bonds, even in areas subject to movement or impact. It also maintains good strength retention after prolonged immersion in water, critical for civil applications.
This two-part epoxy features a simple 1:1 mix ratio by volume, reducing the chance of errors, though precise mixing of Part A and Part B is essential for optimal performance and cure. Once mixed, a creamy, non-sag paste with a 45-minute work time at 25°C allows for careful placement on vertical and overhead surfaces without slumping. It cures reliably at temperatures as low as 10°C and in damp conditions. Tools and mixing implements should be cleaned immediately after use with Megapoxy Thinners to prevent hardened residue.
Megapoxy 254 is specifically engineered for robust, non-sag bonding and filling on vertical or overhead surfaces. Its key advantage lies in its ability to adhere and cure reliably under adverse conditions, including cold and damp environments. This contrasts with many standard adhesives that may sag on vertical applications or experience significant performance loss or outright failure when faced with environmental stresses such as low temperatures or moisture during the cure cycle.
Yes, it forms high-strength permanent bonds. Its 70 MPa compressive strength and concrete bond strength exceeding 3 MPa ensure structural integrity for concrete repairs and heavy-duty bonding applications.
No, when mixed correctly, Megapoxy 254 will not stain or discolour white or light-coloured marble and ceramics. This makes it suitable for use with sensitive finishes where discolouration is a concern.
Apply Megapoxy 254 at a minimum temperature of 10°C. While it is formulated to cure under cold and damp conditions, adhering to this minimum ensures optimal performance and reliable cure times.
Yes, thorough surface preparation is critical for achieving documented bond strengths on metal. Grit blasting to AS CK 9.4 - 1964 Class 3 is recommended; wire brushing is insufficient and will provide minimal adhesion only.
| Application | Key benefit | Primary trades |
|---|---|---|
| Bonding precast concrete articles | Achieves >3 MPa bond strength to concrete, creating high-strength, permanent connections for structural elements. | Civil contractors, precast manufacturers |
| Metal to concrete bonding | Forms a strong, permanent bond to steel (20 MPa tensile bond strength) and concrete, ideal for anchoring or joining dissimilar materials. | Structural engineers, fabricators, concrete repairers |
| Grouting bolts and anchors | Delivers 70 MPa compressive strength, securely embedding bolts and anchors with integrity superior to concrete itself. | Mechanical engineers, installers, civil contractors |
| Repair of concrete pipes, tanks, floors, and stairs | Offers excellent tensile and flexural strengths (22 MPa and 38 MPa respectively) for durable, chemical-resistant repairs to critical infrastructure. | Concrete repair specialists, civil contractors |
| Bonding natural stone, bricks, and ceramics | Will not stain or discolour white or light-coloured sensitive materials when properly mixed, providing clean, secure adhesion. | Tilers, stonemasons, landscapers |
| Vertical and overhead filling and repair | Non-sag properties ensure the paste stays in place on vertical and overhead surfaces without slumping during application. | Concrete repairers, builders |
| Bonding and curing in damp or cold conditions | Adheres and cures effectively under adverse conditions (down to 10°C and damp), extending the working window and reducing weather-related delays. | All trades working outdoors or in unconditioned spaces |
| Flush-filling countersunk screws in fibre cement sheet | Provides a smooth, durable, and VOC-free finish for concealed fixings, allowing for painting or further surface treatments. | Carpenters, facade installers |
Ensure all substrates are prepared as per the Substrate Preparation Guide. The surface must be clean, sound, and free of all laitance, grease, oil, dust, and any previous coatings. This step is critical to achieving the specified bond strength.
It is essential that the correct 1:1 ratio is used and that the parts are mixed thoroughly. Inaccuracies or poor mixing will lead to a failed cure and discolouration.
Dispense 1 Part A to 1 Part B by volume onto a clean mixing board or surface.
Using a spatula or trowel, blend the two parts vigorously. Scrape the edges and fold the material back into the centre repeatedly until a completely uniform, streak-free white paste is achieved.
Apply the mixed paste to the prepared substrate using a spatula or trowel. For bonding, apply to one or both surfaces and press together firmly. For filling, press the paste firmly into the void, ensuring no air is trapped.
DANGER: Causes skin irritation. May cause an allergic skin reaction. Causes serious eye damage. Toxic to aquatic life with long lasting effects.
Wear safety shoes, protective gloves (nitrile rubber recommended for intermittent contact), and safety glasses. A suitable respirator should be worn if breathing dust, fume, gas, mist, vapours, or spray cannot be avoided.
Natural ventilation is adequate under normal use conditions. Ensure that eyewash stations and safety showers are close to the workstation location.
Store in a cool, dry, well-ventilated place and out of direct sunlight. Keep containers upright and closed when not in use. Store away from foodstuffs, incompatible materials (oxidising agents), and sources of heat or ignition. Dispose of contents and container in accordance with local, regional, national, and international regulations. This material is a Scheduled Poison Schedule 5 (Caution).
Proper substrate preparation is essential for Megapoxy 254 to achieve its documented bond strengths and ensure long-term performance.
Surface prep: Degrease thoroughly to remove oil and grease. Remove all surface laitance by mechanical abrasion such as scabbling, grit blasting, or grinding. If mechanical methods are not possible, acid etch using a 1:1 hydrochloric acid solution at 0.5 L/m², allowing it to react for 10 minutes before washing and scrubbing. Allow 24 hours to dry. Concrete must be surface dry for maximum adhesion.
Primer: Not required.
Surface prep: Grit blast to AS CK 9.4 - 1964 Class 3 finish. If grit blasting is not feasible, mechanically abrade to a clean, bright metal finish. After abrasion, degrease the surface with an industrial-grade degreaser. Note that wire brushing alone is insufficient and results in minimal adhesion.
Primer: Not required.
Surface prep: All existing paint, coatings, or galvanising must be completely removed. For coated concrete, flame-cleaning or mechanical treatment with a scutching tool should be followed by diamond grinding or scabbling. For coated metals, use a good quality paint stripper, then grit blast or grind to a bright metal finish.
Primer: Not required.
| Property | Value |
|---|---|
| Mixing Ratio By Volume | 1 Part A to 1 Part B |
| Work Time at 25C | 45 minutes |
| Minimum Application Temperature | 10°C |
| Maximum Operating Temperature | 70°C |
| Compressive Strength (ASTM D695-23) | 70 MPa |
| Bond Strength Concrete (ASTM 4541) | >3 MPa |
| Tensile Bond Strength Steel (ASTM D897-08) | 20 MPa |
| Modulus of Elasticity (ASTM D695) | 2 GPa |
| Flexural Strength (ASTM D790-17) | 38 MPa |
| Tensile Strength (ASTM D638-22) | 22 MPa |
| Tensile Shear Strength (ASTM D1002-10) | 13 MPa |
| Hardness Shore D (ASTM D2240-00) | 70 |
| Coefficient of Linear Thermal Expansion | 70.4 x 10^-6 mm/mm/°C |
| Dielectric Strength 50Hz at 25C | 190 Kv/cm |
| Minimum Cure Time at 15C | 48 hours |
| Minimum Cure Time at 25C | 24 hours |
| Minimum Cure Time at 35C | 12 hours |
| VOC Content | Nil |
Here are some common examples on where Megapoxy 254 used by our customers.
