For structural concrete crack repair, low-pressure injection, and masonry sealing, Megapoxy HX is a 100% solids, solvent-free epoxy liquid with an extra-low mixed viscosity of 200cps at 25°C. This thin profile enables deep capillary penetration into tight fissures, pores, and micro-cracks across concrete, masonry, timber, fibreglass, and metal substrates.
Megapoxy HX functions as a deep-penetrating hydrophilic liquid resin that cures to high compressive and tensile strengths. By displacing air through capillary action or low-pressure injection, it forms a permanent bond within the substrate that is mechanically stronger than concrete itself. Its 100% solids formulation ensures zero shrinkage during cure, preserving the structural integrity of repairs in floors, castings, and laminating applications. It is also formulated to resist a wide range of industrial chemicals, making it suitable for long-term surface hardening and sealing of porous masonry.
Megapoxy HX is formulated for trade applications requiring high-penetration liquid resins, including:
For optimal bond strength, all substrates must be dry, clean, and free from surface laitance, grease, and oil.
Concrete Preparation: Remove surface laitance via mechanical abrasion (scabbling, grit blasting, or grinding). If mechanical preparation is not possible, acid etch using a 1:1 mix of concentrated hydrochloric acid and water at a rate of 0.5 litres per square metre. Let react for 10 minutes, scrub with a stiff broom, rinse thoroughly, and allow to dry for 24 hours.
Metal Preparation: Grit blast to AS 1627.2.2002 or mechanically grind to a bright metal finish, then degrease with an industrial-grade degreaser.
Capillary Action Crack Repair: Clean the crack by applying Methylated Spirits or Acetone, then brush-coat the mixed Megapoxy HX directly over the crack. The resin will draw deep into the fissure as the solvent evaporates.
Low-Pressure Injection: Grind the concrete surrounding the crack. Bond crack injection balloons 300mm apart over the crack using Megapoxy PM paste, sealing the bases and 50mm on either side of the crack. Once the PM paste cures, pump mixed Megapoxy HX through the balloon ports using a crack injection gun until the balloons inflate to approximately 20mm and stay filled. Knock off ports and grind smooth once cured.
Clean-up: Clean all mixing implements and application tools immediately after use with Megapoxy Thinners.
Megapoxy HX's extra low viscosity of 200 cps is formulated for deep penetration into very fine concrete cracks. This allows for thorough impregnation and permanent repair, even where higher viscosity products would not reach.
No. For maximum adhesion, the concrete surface must be dry. After surface preparation, allow concrete to dry for 24 hours before application. This ensures optimal bond strength and performance.
Inaccurate mixing ratios or insufficient mixing will compromise the cured system. This can lead to lower physical properties, unsatisfactory cure, or discolouration. Always adhere to the 3 Part A to 1 Part B volume ratio and mix thoroughly.
Yes, Megapoxy HX is suitable as a low viscosity laminating resin for fibreglass. Its thin consistency ensures full wet-out of the material, which is critical for achieving strong, void-free laminates.
| Application | Key benefit | Primary trades |
|---|---|---|
| Concrete crack repair | Extra low 200 cps viscosity ensures deep penetration into fine cracks for permanent structural repair, superior to concrete at 140 MPa compressive strength. | Concrete repairers, Civil engineers, Restorers |
| Porous substrate impregnation | Effectively seals and strengthens porous materials like masonry and timber by capillary action, enhancing durability. | Heritage restorers, Builders, Masonry specialists |
| Low viscosity laminating | Achieves full wet-out for robust fibreglass work, creating strong, void-free laminates with 59 MPa tensile strength. | Fibreglass fabricators, Marine repairers, Composites trades |
| Surface hardening | Increases the wear resistance and durability of concrete and masonry surfaces through deep penetration. | Floor specialists, Industrial painters, Maintenance crews |
Signal Word: Danger
Wear safety shoes, nitrile rubber gloves, safety glasses, and a suitable respirator. Always wash hands before smoking, eating, drinking, or using the toilet. Wash contaminated clothing before reuse.
Natural ventilation is adequate under normal use conditions. Avoid inhalation of vapour, mist, or aerosols.
Store in a cool, dry, well-ventilated place, out of direct sunlight, and away from foodstuffs and incompatible materials. Keep containers closed and upright, checking regularly for leaks. Store locked up. Dispose of material and containers in accordance with local, regional, and national regulations. Avoid contaminating waterways.
Proper surface preparation is crucial for Megapoxy HX to achieve its documented bond strengths and ensure a lasting repair or bond.
Surface prep: Ensure concrete is free from grease and oil. Clean with an industrial heavy-duty degreaser if needed. Remove surface laitance by mechanical abrasion (scabbling, grit blasting, or grinding). If mechanical abrasion is not feasible, acid etch with a 1:1 hydrochloric acid and water solution at 0.5 L/m². Allow 10 minutes to react, then wash thoroughly and scrub to remove loose sand. Allow to dry for 24 hours. For maximum adhesion, the concrete must be surface dry.
Primer: Not required. Megapoxy HX is designed for direct application to prepared concrete.
Surface prep: Grit blast to AS 1627.2.2002 standard. If grit blasting is not possible, mechanically abrade to a clean, bright metal finish. After abrasion, degrease the surface by flooding with an industrial-grade degreaser. Wire brushing is insufficient and will yield minimal adhesion.
Primer: Not required. The product is designed to bond directly to prepared metal surfaces.
Surface prep: It is critical to remove all existing coatings prior to bonding. Bonding to coated surfaces will result in inferior bond strengths compared to bonding directly to a properly prepared substrate.
Primer: Not required after complete removal of coatings and proper substrate preparation.
| Property | Value |
|---|---|
| Mixing Ratio By Volume | 3 Part A to 1 Part B |
| Work Time at 25°C | 60 minutes |
| Minimum Application Temperature | 10°C |
| Viscosity Part A at 25°C | 400 - 600 cps |
| Viscosity Part B at 25°C | 15 - 20 cps |
| Mixed Viscosity at 25°C | 200 cps |
| Specific Gravity Part A at 25°C | 1.10 - 1.12 |
| Specific Gravity Part B at 25°C | 0.95 - 0.97 |
| Mixed Specific Gravity at 25°C | 1.07 |
| Colour Part A | Clear |
| Colour Part B | Clear |
| Colour Mixed | Clear |
| Yield Compressive Strength - ASTM C579 | 70 MPa |
| Ultimate Compressive Strength - ASTM C579 | 140 MPa |
| Bond Strength Concrete - ASTM D4541 | >3 MPa |
| Tensile Bond Strength Steel - ASTM D897 | 20 MPa |
| Modulus of Elasticity - ASTM C579 | 0.055 GPa |
| Flexural Strength - ASTM D790 | 80 MPa |
| Tensile Strength - ASTM D638 | 59 MPa |
| Tensile Lap Shear Strength - ASTM D1002 | 15 MPa (steel to steel) |
| Hardness - Shore D - ASTM D2240 | 75 |
| Dielectric Strength (kV/mm) | 24.4 |
| Surface Resistivity (Ohm) - ASTM D257 | 10¹² |
| Volume Resistivity (Ohm.cm) | 1.23 x 10¹¹ |
| VOC (g/l) - ASTM D3960 | 6 g/l |
| Thin Film Cure at 25°C | 6-8 hours |
| Minimum Cure Time at 15°C | 48 hours |
| Minimum Cure Time at 25°C | 24 hours |
| Minimum Cure Time at 35°C | 12 hours |
Here are some common examples on where Megapoxy HX used by our customers.
