Megapoxy PF

For emergency repairs to concrete structures, pipes, and tanks, Megapoxy PF is a rapid-set epoxy paste adhesive that hardens-as-you-hold-it. It sets in seven minutes and achieves more than half its ultimate strength within 15 minutes of mixing at 25°C, making it suitable for immediate on-the-spot repairs, vertical grouting, and overhead bonding where sag must be avoided.

What it does

Megapoxy PF provides high-strength permanent bonds across mismatched substrates including concrete, steel, natural stone, and fibreglass. Its creamy paste texture allows for smooth application on vertical surfaces without dripping. When properly mixed, the formula is non-staining, preventing discolouration on white or light-coloured marble, ceramics, and natural stones. The rapid cure profile allows the material to be machined after 30 minutes of curing at 25°C.

Numbers that matter

• 3-minute work time (at 25°C): Extremely tight application window requiring rapid placement immediately after mixing.
• 1-hour minimum cure (at 25°C): Achieves 90% cure within 60 minutes; cures in 2 hours at 15°C and 30 minutes at 35°C.
• 70 MPa compressive strength (ASTM D695-23): Provides high-load compressive resistance superior to standard concrete.
• 16 MPa tensile bond strength on steel (ASTM D897-08): Delivers high-adhesion mechanical bonding when joining metal to metal or concrete.
• >3 MPa bond strength on concrete (ASTM D4541): Ensures structural adhesion that exceeds the cohesive strength of the concrete substrate.

Where to use it

Megapoxy PF is formulated for structural assembly and fast-turnaround maintenance, including:

• Bonding precast concrete articles, bricks, ceramics, and compressed cement sheet.
• Grouting bolts and anchoring fasteners into concrete columns or walls.
• Filling and repairing concrete pipes, tanks, stairs, and insitu formed concrete.
• Flush-filling countersunk screws in fibre cement sheet.
• Repairing and structural bonding of fibreglass articles.

Limitations

• Do not apply below 10°C: The minimum application temperature required for the chemical reaction to initiate.
• Strict 1:1 mix ratio: Part A and Part B must be thoroughly mixed. Inaccuracies will lower physical properties, prevent satisfactory curing, and cause discolouration on ageing.
• Abrasive preparation required: Bonding to coated surfaces yields inferior strength. All paint, galvanising, and coatings must be removed to reach a bright metal or raw concrete finish.
• No wire brushing on metal: Hand wire brushing does not provide sufficient mechanical key, resulting in minimal adhesion only.

How to apply

Substrates must be properly prepared to ensure permanent adhesion:

• Concrete: Must be free from grease and oil. Remove surface laitance via mechanical abrasion (scabbling, grit blasting, or grinding). If mechanical preparation is not possible, acid etch with a 1:1 hydrochloric acid and water mix at 0.5 litres per square metre, allow to react for 10 minutes, scrub, flush clean, and dry for 24 hours. Substrate must be surface dry for maximum adhesion.
• Metal surfaces: Grit blast to AS CK 9.4 - 1964 Class 3 finish, or mechanically grind to a clean, bright metal finish, then degrease by flooding with industrial grade degreaser.
• Coated surfaces: Remove paint from concrete using a scutching tool or flame cleaning, followed by diamond grinding. Remove paint and galvanising from metals using a quality paint stripper followed by grit blasting or grinding.
• Cleanup: Clean mixing tools and implements immediately after use with Megapoxy Thinners. Wear disposable rubber gloves during application.