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When the job demands structural integrity in concrete, Megapoxy HT delivers. It forms high-strength, permanent bonds even between new and old concrete, resisting the toughest conditions. This hydrophilic epoxy gel handles demanding concrete repairs, horizontal steel anchoring, and holds firm in wet, submerged, or chemically aggressive environments like sewage treatment plants. It ensures your critical repairs and bonds outlast the substrate itself.
Megapoxy HT is a 100% solids, solvent-free, and VOC-free hydrophilic epoxy gel adhesive. It was engineered to create exceptionally strong, permanent bonds, often superior to the concrete it joins. Its formulation provides resistance to hydrogen sulphide, making it reliable in challenging environments such as wastewater infrastructure. Megapoxy HT is also suitable for forming high-strength epoxy mortars when mixed with fine aggregates, providing versatility for various concrete and flooring applications.
Accurate mixing is essential for Megapoxy HT. Combine 3 parts Part A to 1 part Part B by volume, then mix thoroughly. Incomplete or inaccurate mixing will compromise the cured properties. Once mixed, there is a 30-minute work time at 25°C, requiring efficient application. Ensure the minimum application temperature of 10°C is met for proper curing.
For concrete, surfaces must be clean, free from grease and oil, and have all surface laitance removed by mechanical abrasion (scabbling, grit blasting, grinding) or acid etching. Allow the concrete to dry for 24 hours, aiming for a surface-dry condition for maximum adhesion. Metal surfaces require grit blasting to AS CK 9.4 - 1964 Class 3 or mechanical abrasion to a clean, bright finish, followed by thorough degreasing. Wire brushing alone is insufficient. All existing coatings must be completely removed from surfaces to achieve optimal bond strength.
Clean tools and mixing implements with Megapoxy Thinners. Wear disposable rubber gloves and follow industrial hygiene practices.
Megapoxy HT is frequently specified as a critical adhesive in waterproofing and tiling systems over concrete membranes. For instance, in a membrane-covered tiled concrete deck, it can be applied after a damp concrete primer and membrane like Everflex VBS and Dowsil 888 Silicone Joint Sealant. Here, Megapoxy HT functions as a high-performance adhesive, ensuring the tiled finish remains securely bonded to the prepared substrate. It also serves as the foundational first step in Tacktile Anchoring systems, directly bonding tactile indicators to prepared concrete.
Megapoxy HT is a high-strength, rigid hydrophilic epoxy gel adhesive optimised for demanding conditions, particularly horizontal steel anchoring and wet environments. When the application involves vertical steel anchoring, consider Megapoxy H. Megapoxy H is specifically formulated with a non-sag rheology that holds steel in place against gravity during cure, making it suitable for overhead or vertical applications where Megapoxy HT's flow characteristics would be unsuitable.
Yes, Megapoxy HT is specifically formulated for underwater and splashzone repairs. Its hydrophilic properties ensure reliable bonding in wet conditions, including full immersion.
Megapoxy HT provides a bond strength to concrete exceeding 3 MPa according to ASTM D4541. For new-to-old concrete bonding, slant shear tests show 36 MPa.
Megapoxy HT is intended for horizontal steel anchoring. For vertical steel anchoring, the TDS recommends using Megapoxy H for optimal performance.
Maintaining the correct 3 Parts A to 1 Part B mixing ratio is critical. Inaccurate mixing or insufficient blending will lead to lower physical properties and may result in unsatisfactory curing.
| Application | Key benefit | Primary trades |
|---|---|---|
| New to old concrete bonding | Forms a very high-strength, permanent bond (36 MPa slant shear) superior to concrete, ensuring structural integrity. | Concrete repairers, civil engineers |
| Concrete crack repair | Structurally repairs cracked concrete with a high compressive strength of 100 MPa. Offers resistance to hydrogen sulphide. | Concrete repairers, asset maintenance teams |
| Steel anchoring (horizontal) | Provides a high tensile bond strength of 20 MPa to steel, securing anchors reliably. Engineered to allow air escape during pouring. | Civil engineers, fabricators, general builders |
| Underwater and splashzone repairs | Hydrophilic properties enable effective bonding and repair in wet conditions, including full immersion. Resists hydrogen sulphide. | Marine contractors, municipal engineers |
| Epoxy mortars and concrete | Forms high-strength epoxy mortars and concrete when mixed with fine aggregates. Delivers excellent chemical resistance. | Flooring contractors, industrial concrete specialists |
| Floor repairs | Durable repair solution for damaged concrete floors, featuring 40 MPa flexural strength and 40 MPa tensile strength. | Flooring contractors, industrial maintenance |
The Engineering Challenge: Repairing spalled concrete on a bridge pylon within the tidal splash zone. The repair material must be applied to a permanently damp surface and cure underwater while resisting erosion and chloride attack.
The System-Based Solution with Megapoxy HT: After mechanically removing unsound concrete, apply Megapoxy HT directly to the saturated substrate as a bonding primer. Its hydrophilic properties will ensure it achieves a full bond. Immediately form and apply an epoxy mortar made by mixing Megapoxy HT with specified aggregates. The system cures to form a seamless, high-strength, impermeable patch.
Best Practice Note: Surface preparation is critical. Use high-pressure water blasting or mechanical abrasion to remove all marine growth and laitance to expose a sound, aggregate-filled concrete surface.
The Engineering Challenge: Securing base plates for structural steel columns to a concrete slab, requiring a grout that provides absolute load transfer and prevents any future movement or corrosion.
The System-Based Solution with Megapoxy HT: Use Megapoxy HT to create a high-strength epoxy mortar. After positioning and levelling the column base plate, pour the mortar into the formwork. The material's high compressive strength (100 MPa) and minimal shrinkage ensure full, void-free bearing, while its bond strength to steel (20 MPa) creates a monolithic connection between the column and foundation.
Best Practice Note: Ensure steel base plates are prepared by grit blasting to a Class 3 finish and degreased immediately prior to grouting to achieve maximum tensile bond strength.
Signal Word: Warning (Part A), Danger (Part B)
Wear safety shoes, gloves (nitrile rubber recommended), safety glasses, and a suitable respirator. Always wash hands before eating, drinking, or smoking. Contaminated clothing must be washed before reuse.
Natural ventilation should be adequate under normal use conditions to prevent inhalation of vapours or mists.
Store in a cool, dry, well-ventilated place away from direct sunlight, foodstuffs, incompatible materials, and ignition sources. Keep containers upright and closed. Store locked up. Megapoxy HT Part A is a Class 9 Dangerous Good, and Part B is a Class 8 Corrosive, both Schedule 5 Poisons. Dispose of material and containers according to local, regional, and national regulations; recycling is preferred if possible.
Proper surface preparation is essential for Megapoxy HT to achieve its documented bond strengths and ensure long-term performance.
Surface prep: Concrete must be free from grease and oil. Clean with an industrial heavy-duty degreaser if required. Remove surface laitance by mechanical abrasion such as scabbling, grit blasting, or grinding. If mechanical methods are not feasible, acid etching can be performed: mix concentrated hydrochloric acid with an equal volume of water, spread at 0.5 litres per square metre, allow to react for 10 minutes, then wash thoroughly and scrub to remove loose sand. Allow the concrete to dry for 24 hours. For maximum adhesion, the concrete surface must be dry.
Primer: Not required.
Surface prep: Metals should be grit blasted to AS CK 9.4 - 1964 Class 3 finish. If grit blasting is not possible, mechanically abrade the surface to a clean, bright metal finish. Degrease the surface by flooding with an industrial-grade degreaser after abrasion. Wire brushing is not sufficient and will provide minimal adhesion.
Primer: Not required.
Surface prep: All existing coatings must be fully removed prior to bonding, as bonding to coated surfaces will result in inferior bond strengths compared to direct application to a prepared substrate. For painted concrete, flame-clean or mechanically treat with a scutching tool to remove all paint traces, then complete preparation by diamond grinding or scabbling. For painted or galvanised metals, use a good quality paint stripper followed by grit blasting or grinding to a bright metal finish.
Primer: Not required.
| Property | Value |
|---|---|
| Mixing Ratio by Volume | 3 Part A to 1 Part B |
| Work Time at 25°C | 30 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 |
| Specific Gravity Part A at 25°C | 1.00 - 1.10 |
| Specific Gravity Part B at 25°C | 0.97 - 0.99 |
| Mixed Specific Gravity at 25°C | 1.03 |
| Colour Part A | N35 Grey |
| Colour Part B | Clear |
| Appearance Mixed | N35 Grey |
| Compressive Strength (ASTM D695) | 100 MPa |
| Bond Strength Concrete (ASTM D4541) | >3 MPa |
| Tensile Bond Strength Steel (ASTM D897) | 20 MPa |
| Modulus of Elasticity (ASTM D695) | 1.1 GPa |
| Flexural Strength (ASTM D790) | 40 MPa |
| Tensile Strength (ASTM D638) | 40 MPa |
| Tensile Shear Strength (ASTM D1002) | 13 MPa |
| New to Old Concrete Bonding Slant Shear Test | 36 MPa |
| Hardness Shore D (ASTM D2240-00) | 70 minimum |
| VOC Content | Nil g/Litre |
| Part A Form | Gel |
| Part B Form | Clear Liquid |
| Part A Solubility | Insoluble in water |
| Part B Solubility | Miscible in water and other solvents |
| Part A Flash Point | >200°C |
| Part B Flash Point | 112°C |
| Part B pH | 11.6 |
Here are some common examples on where Megapoxy HT used by our customers.
