Megapoxy H: A Product Overview
For critical structural repairs where there is zero room for compromise, Megapoxy H delivers predictable, high-strength performance. This is a technical, low-viscosity, 100% solids hydrophilic epoxy resin. Its formulation is engineered to penetrate, bond, and cure in the most adverse conditions—including damp, splashzone, and underwater applications—providing a solution that permanently restores structural integrity.
Crucially for specifiers and engineers, Megapoxy H is fully compliant with AS/NZS 4020:2018 for use in contact with potable water, making it the verifiable, smart choice for infrastructure projects. With its Nil V.O.C., solvent-free formulation and exceptional 100Mpa compressive strength, it’s the go-to resin for crack injection, new-to-old concrete bonding, and creating robust epoxy mortars. This is the solution for a first-time-right repair that is stronger than the original concrete.
100Mpa
Compressive Strength — Creates epoxy mortars and repairs that are significantly stronger than the original concrete, guaranteeing a permanent structural solution.
Core Features & Specifications
- Hydrophilic Formula: 'Water-loving' chemistry allows it to displace water, making it possible to bond and cure effectively in damp, splashzone, and even underwater conditions.
- Low Viscosity for Injection: A thin, 800cps mixed viscosity ensures deep, full penetration for structural crack injection, filling fine fissures that thicker epoxies can't reach.
- Superior New-to-Old Concrete Bonding: Achieves an exceptional 36MPa slant shear strength, creating a truly monolithic, load-bearing bond between new and old concrete.
- Nil V.O.C. & Solvent-Free: A 100% solids, solvent-free, and Nil V.O.C. formulation, making it a safer choice for sensitive or enclosed environments.
- Versatile 3:1 Mix Ratio: A simple 3 Parts A to 1 Part B by volume ratio for easy and accurate site mixing.
The Megapoxy H Advantage
- Specify with Zero Doubt: The combination of AS 4020 certification and massive 100Mpa strength provides the verifiable proof needed for high-stakes engineering and infrastructure projects.
- Deliver Permanent Structural Repairs: This isn't a cosmetic patch. Its low viscosity penetrates and its high strength restores true structural integrity, removing the risk of costly callbacks.
- A Versatile System Resin: One product handles multiple critical applications. Use it for injection, as a bonder, as a primer, or as the binder for high-performance epoxy mortars.
- Solves Problematic Site Conditions: The hydrophilic nature turns a damp substrate from a problem into a non-issue, saving time, reducing risk, and ensuring predictable performance.
Adheseal tips for using Megapoxy H
Scenario: Incorrect Mix Ratio
Potential Outcome: The epoxy fails to cure, remains soft, or has severely compromised strength. This results in a total bond failure and a costly, difficult removal and redo.
Adheseal Best Practice: The 3 Part A to 1 Part B ratio is by *volume* and must be measured accurately. Use graduated mixing containers. Do not guess or mix by weight. Poor mixing will lead to a failed cure.
Scenario: Poor Surface Preparation
Potential Outcome: The adhesive bonds to laitance or contaminants, not the solid substrate. This leads to delamination or bond failure under load, completely compromising the repair.
Adheseal Best Practice: Mechanical abrasion (grit blasting, grinding) to remove all laitance is essential. For steel, grit blast to a Class 3 finish. Wire brushing is *not* sufficient and gives minimal adhesion only.
Applications in Practice: Trade Scenarios
For Remedial Specialists: Structural Crack Injection
The Professional's Challenge
Repairing structural cracks in a concrete slab, beam, or potable water tank, where the repair must be permanent and the resin must fully penetrate.
The Adheseal Solution
Use the low-pressure injection method. Seal the crack face and bond injection ports with Megapoxy PM. Once cured, inject the low-viscosity Megapoxy H. It will flow deep into fine cracks. Its AS 4020 compliance makes it the perfect choice for the water tank. Success means a monolithic, fully-sealed structural repair.
Best Practice Note
Start injecting from the lowest point on a vertical crack. Pump until the resin exudes from the next port above, then cap the first port and move up.
For Engineers & Concreters: High-Strength Mortar
The Professional's Challenge
Needing a high-strength, chemically resistant mortar for repairing a heavily trafficked floor, regrading a surface, or grouting large holding bolts.
The Adheseal Solution
Megapoxy H is the ideal binder. Prime the prepared concrete with a neat coat of Megapoxy H. Then, mix the resin and add the specified aggregate (e.g., 12 parts Silica 50N by volume) to create a 90Mpa trowellable mortar. Success means a custom, high-performance mortar that is far stronger and more durable than a cementitious repair.
Best Practice Note
Always prime the substrate with neat Megapoxy H first. This ensures the mortar bonds *to* the substrate, rather than just sitting *on* it, for a permanent, delamination-free repair.
Frequently Asked Questions
Is Megapoxy H certified for drinking water tanks?
Yes. Megapoxy H is fully compliant with AS/NZS 4020:2018, which is the Australian standard for "Testing of Products For Use In Contact with Drinking Water". This makes it a verifiable and safe choice for repairs inside potable water structures.
What is the mix ratio for Megapoxy H and is it critical?
The mix ratio is 3 Parts A to 1 Part B by volume, and yes, it is essential. Do not guess or mix by weight. Using the wrong ratio or mixing poorly will result in the system failing to cure or not achieving its specified 100Mpa strength.
What does 'hydrophilic' mean for this epoxy?
Hydrophilic means the resin is 'water-loving'. This special formulation allows Megapoxy H to displace water from a surface, enabling it to bond effectively in damp conditions, splash zones, and even for underwater repairs. It removes the risk of bond failure on damp substrates.
How do I use Megapoxy H for concrete crack injection?
Its low viscosity (800cps) is perfect for injection. First, you 'V' groove the crack and seal the surface with a paste like Megapoxy PM, bonding injection ports every 200-400mm. Once the paste is cured, inject the mixed Megapoxy H into the lowest port until it flows out of the one above.
How do I bond new concrete to old concrete with Megapoxy H?
First, mechanically prepare the old concrete. Then, apply the mixed 3:1 Megapoxy H with a brush or roller at 1-1.5 litres per square metre. You must place the new concrete within 15 minutes of applying the epoxy to ensure a "wet-to-wet" monolithic bond.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Concrete Crack Repair (Low Pressure Injection) | Low viscosity (800cps) penetrates fine cracks for a full structural repair. | Remedial Contractors, Concreters |
| New to Old Concrete Bonding | Creates a monolithic bond (36Mpa Slant Shear) stronger than concrete. | Builders, Civil Engineers |
| Repairs in Potable Water Tanks & Pipes | Fully certified to AS/NZS 4020:2018 for safe contact with drinking water. | Asset Maintenance, Plumbers |
| Creating High-Strength Epoxy Mortars | Versatile binder for custom, high-strength (70-100Mpa) grouts and mortars. | Flooring Contractors, Engineers |
| Steel Anchoring & Grouting | High tensile bond (20Mpa to steel) for secure, permanent anchoring. | Fabricators, Builders |
| Underwater / Splashzone Repairs | Hydrophilic formula allows for bonding and curing in damp and wet conditions. |
Applying Megapoxy H: Enhanced Protocols & Best Practices
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Step 1: Surface Preparation
Ensure all substrates are prepared according to the Adhesion Profile. Surfaces must be sound, clean, and free of all contaminants, laitance, or previous coatings to ensure a permanent, structural bond. Mechanical abrasion is the preferred method.
Pro Tip: Do not cut corners on preparation. For steel, wire brushing is not sufficient and will lead to a substandard bond. -
Step 2: Critical 3:1 Ratio Mixing
This is the most critical step for achieving the product's specified strength. Inaccurate mixing will lead to cure failure.
Measuring
Measure exactly 3 Parts A to 1 Part B by volume. Use separate, clean, graduated mixing containers to ensure accuracy.
Mixing
Combine the two parts into a clean mixing vessel. Mix thoroughly with a flat paddle or mechanical mixer at low speed. Scrape the sides and bottom of the container multiple times to ensure no unblended material remains. Mix until 100% uniform in colour.
Timing: The work time (pot life) is 30 minutes at 25°C. This time will be shorter in hotter weather and longer in cold weather. Only mix what you can comfortably use within this timeframe. -
Step 3: Application (as a Bonder)
For bonding new concrete to old, apply the mixed Megapoxy H to the prepared old concrete surface using a brush, roller, or airless spray.
Coverage
Apply at a rate of 1 to 1.5 litres per square metre. Ensure an even, full coat.
Timing: This is critical: you must place the new concrete within 15 minutes of applying the Megapoxy H to ensure a wet-to-wet chemical bond.Pro Tip: For vertical or overhead rendering, the bond coat will be too thin and may run. For these applications, use the thixotropic version, Megapoxy HT. -
Step 4: Application (as a Mortar Binder)
To create a high-strength epoxy mortar, you must prime the surface first.
Priming
Apply a brush coat of pre-mixed, neat Megapoxy H to the prepared concrete surface. Do not let this coat cure.
Mortar Application
While the primer coat is still wet, apply your mixed epoxy mortar (e.g., Megapoxy H + 12 parts Silica 50N) and trowel to the desired finish.
Pro Tip: To avoid the steel trowel sticking and dragging the mortar, broadcast a very thin layer of Silica 50N over the mortar surface and work it in with the trowel for a smooth finish.
Limitations & Safety
Product Limitations
Professional Use Only: This product is a hazardous, two-part system intended for professional civil engineering and remedial use. It is not for DIY use.
Corrosive: Part B is corrosive and causes severe skin burns and irreversible eye damage (Category 1). Part A is a skin/eye irritant.
Sensitiser: Both Part A and Part B may cause an allergic skin reaction (sensitisation). Persons already sensitised may react to very low levels. Avoid all skin contact.
Mix Ratio: The 3:1 mix ratio by volume is critical. Do not alter this ratio or guess. Inaccurate mixing will result in a failed cure and complete loss of physical properties.
Temperature: Do not apply at substrate or ambient temperatures below 10°C.
Safety & Handling Requirements
Personal Protective Equipment (PPE)
Always wear safety glasses with side shields (or a face shield) and protective gloves (nitrile rubber recommended). Wear chemical-resistant overalls or apron and safety shoes to prevent all skin contact.
Ventilation Requirements
Natural ventilation should be adequate under normal use. Avoid breathing vapours. Ensure that eyewash stations and safety showers are close to the workstation location.
Fire & Handling Precautions
Non-combustible material (Part A >200°C, Part B 112°C). Store locked up, in a cool, dry, well-ventilated place out of direct sunlight and away from foodstuffs.
Emergency First Aid
Eyes:
CRITICAL: Part B is Corrosive. Immediately irrigate with copious quantities of water for 15 minutes. Eyelids must be held open. Remove contact lenses if present. Urgently seek medical assistance.
Skin:
CRITICAL: Part B causes severe skin burns. Immediately remove contaminated clothing and flush skin and hair with running water. For skin burns, cover with a clean, dry dressing until medical help is available. Do NOT break blisters.
Inhaled:
Remove victim from exposure to fresh air. Keep at rest. Seek medical advice if effects persist.
Swallowed:
Part B is Harmful if Swallowed. Rinse mouth with water. Do NOT induce vomiting. Give a glass of water to drink. Immediately call Poisons Centre (13 11 26) or Doctor.
Refer to the Safety Data Sheet (SDS) for Part A and Part B before use.
Megapoxy H Surface Preparation Guide
Concrete
Surface Preparation
Surfaces must be sound, clean, and free from grease and oil. Remove all surface laitance for a successful bond. Mechanical abrasion (grit blasting, grinding, or scabbling) is the best method. If this is not possible, acid etching can be used, but must be thoroughly washed and dried for 24 hours. The hydrophilic nature of Megapoxy H allows it to bond to surface-dry or damp concrete.
Primer Requirements
No primer specified
Megapoxy H acts as its own primer. When creating epoxy mortars, it is critical to prime the prepared concrete with a neat coat of Megapoxy H before applying the mortar.
Metal Surfaces (Steel)
Surface Preparation
Metals must be grit blasted to AS CK 9.4-1964 Class 3 finish for maximum adhesion. If grit blasting is not possible, mechanically abrade the surface to a clean, bright metal finish. Once abraded, flood with an industrial grade degreaser. Note: Wire brushing is not entirely satisfactory and provides minimal adhesion only.
Primer Requirements
No primer specified
No primer is specified in the technical data. Bond performance is dependent on achieving a bright, clean, abraded metal finish.
Coated Surfaces (Paint / Galvanizing)
Surface Preparation
Bonding to coated surfaces is not recommended as it will result in inferior bond strengths. All paint and/or galvanizing must be removed. Use a good quality paint stripper, followed by grit blasting or grinding to a bright metal finish (for metals) or diamond grinding (for concrete).
Primer Requirements
Not Applicable
Do not bond to coated surfaces. Substrate must be prepared back to its original state.
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