Description
Gaps in concrete, steel and stone are filled and bonded with Megapoxy P1, a two-component paste based on DGEBA epoxy resin and carbonate-free filler. It mixes in equal parts.
The TDS describes it as very low in volatile organic compounds and suitable for repairs of structures in contact with potable water, states that it complies with AS/NZS 4020:2018, and notes resistance to hydrogen sulphide that may be present in sewage treatment pipes and plants.
Technical Specifications
| Type | Two-component gap filling adhesive, DGEBA epoxy resin with carbonate-free filler |
|---|---|
| Mixing ratio by volume | 1 part A to 1 part B |
| Work time at 25 degrees C | 60 minutes |
| Minimum cure time | 48 hours at 15 degrees C, 24 hours at 25 degrees C, 12 hours at 35 degrees C |
| Full cure at 25 degrees C | 4 days |
| Minimum application temperature | 10 degrees C |
| Maximum operating temperature | 80 degrees C |
| Colour | Part A white, Part B black; mixed colour dark grey |
| Compressive strength (ASTM C579) | 80 MPa |
| Yield compressive strength (ASTM C579) | 55 MPa |
| Bond strength to concrete (ASTM D4541) | Greater than 3 MPa |
| Tensile bond strength to steel (ASTM D897) | 18 MPa |
| Tensile lap shear (ASTM D1002) | 13 MPa (steel to steel) |
| Hardness, Shore D | 75 |
| VOC (ASTM D3960) | 4 g/l |
| Packaging | 4 litre and 20 litre kits |
Where to Use
The TDS lists these applications
- Protection of reinforcing steel where concrete cover is insufficiently thick
- Repairs to structures in contact with potable water
- Bonding precast concrete, bricks, ceramics, natural stones and compressed cement sheet
- Bonding metal to metal or concrete, grouting bolts, flush-filling countersunk screws in fibre cement sheet, and filling and repair of concrete pipes, tanks, floors, stairs and columns
How to Apply
- Prepare the surface: concrete must be free of grease and oil, with laitance removed by scabbling, grit blasting or grinding. For maximum adhesion the concrete should be surface dry.
- Prepare metal: grit blast to AS 1627.2.2002 or abrade to clean, bright metal, then degrease. Remove coatings first.
- Measure and mix: combine equal volumes of Part A and Part B and mix thoroughly. Do not mix the parts together using water. Work within 60 minutes at 25 degrees C.
- Apply and cure: apply to the prepared substrate and allow at least the minimum cure time for the temperature.
- Clean up: use Megapoxy Thinners on mixing implements and tools, and wear disposable rubber gloves.
Safety and Handling
- The TDS says to use disposable rubber gloves to protect hands and maintain proper industrial hygiene.
- It stresses that the correct mixing ratio must be used and that Part A and Part B are thoroughly mixed before use. Part A and Part B must not be mixed together using water.
- The TDS gives a flash point above 200 degrees C and refers to the Megapoxy P1 Safety Data Sheet for further details. The TDS itself gives no hazard statements, so check the Safety Data Sheet for skin, eye and ventilation precautions before use.
Important Notes
- Inaccurate ratios or poor mixing lower the physical properties of the cured system and, if the error is large enough, the system may not cure satisfactorily and may discolour on ageing.
- Wire brushing is described as not entirely satisfactory for metal, giving minimal adhesion only. Bonding to coated surfaces gives inferior bond strengths, so the TDS recommends removing all coatings.
- This page follows the manufacturer’s TDS, Revision 4, 29 January 2026.
