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Megapoxy H is a low-viscosity, 100% solids hydrophilic liquid epoxy resin engineered for critical structural remediation in civil engineering and marine infrastructure. Formulated with an 800cps mixed viscosity for deep penetration during low-pressure crack injection, it achieves a 100MPa compressive strength and effectively displaces moisture to bond in splash zones or damp environments.
This solvent-free, Nil V.O.C. resin is fully compliant with AS/NZS 4020:2018 for potable water contact and provides specialized resistance to hydrogen sulphide gases in sewage treatment plants.
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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