Pool System Build-Up
- 1 Concrete Substrate
- 2 Crack Repair (if required)
- 3 ACTFLEX FLEXPLUS
- 4 ACTFLEX HYDROPLUG
- 5 ACTFLEX AT MESH
- 6 ACTFLEX 988 CWP (2 Coats)
- 7 Tile Adhesive
- 8 Pool Finish
ACTFLEX ER300 - Low-Viscosity Epoxy Crack Injection Resin
or 4 interest-free payments with
Structural epoxy injection for 0.1 to 1.0 mm cracks in concrete. Zero shrinkage, and stronger than the concrete around it.
ACTFLEX ER300 is a two-component, solvent-free, low-viscosity epoxy injection resin for restoring structural continuity to cracked reinforced concrete. It is machine injected through the FORSPEC INJEXA SWDM 2500, which meters and mixes Part A and Part B at the nozzle.
Where to use it
- Structural crack injection of fine to medium cracks in reinforced concrete
- Restoring load-bearing capacity in cracked slabs, beams and columns
- External steel plate bonding for structural strengthening
- Floor lifting and delamination repair, re-bonding lifted concrete and detached toppings
- Bridges, tunnels, industrial flooring and warehouse slabs
Why waterproofers buy it
- Compressive strength over 80 MPa, tensile over 25 MPa, flexural over 45 MPa (ASTM test methods)
- Zero shrinkage on cure, so the crack stays filled and the bond stays intact
- Low viscosity, 500 to 800 cps mixed, so it travels the full depth of the crack
- Solvent free, no volatile solvents
- Bonds to dry and slightly damp substrates
- Seals against moisture, chloride and carbonation ingress to protect the reinforcement
- Pot life approx. 35 minutes. Load or traffic after 18 hours. Full strength at 7 days
Coverage
15 kg set: approx. 460 m of a 0.2 x 150 mm crack, 185 m at 0.5 x 150 mm, 92 m at 1.0 x 150 mm. These are theoretical crack volumes. Real use is routinely higher because voids and branching cracks take resin, so allow extra for machine priming, static mixer waste and line flushing.
Not for
Active leaks or cracks carrying running water (stop the flow with ACTFLEX HYDROPLUG or use ACTFLEX PU200), cracks finer than 0.1 mm (specify CRACKLOCK E400L), live or moving cracks, movement or expansion joints, injection pressure above 25 bar, or application outside 10°C to 30°C. Not a flexible repair.
All times at 25°C and 50% RH. No accredited certificate is held for ACTFLEX ER300; strength values are Forspec test data against ASTM methods.
Zero shrinkage on cure - the crack stays filled and the bond stays intact
Low viscosity, 500-800 cps mixed, penetrates the full depth of 0.1-1.0 mm cracks under pressure
Structural grade - compressive, tensile and flexural strengths exceed those of the surrounding concrete
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ACTFLEX ER300 - Low-Viscosity Epoxy Crack Injection Resin
The Waterproofing Shop
22/872 Canterbury Road
Roselands NSW 2196
Australia
How to Use
Technical Specifications
Product Files
ACTFLEX ER300 - Low-Viscosity Epoxy Crack Injection Resin
Sale price$550.00
Frequently bought together
System Build-Up Guide
Correct application makes all the difference.
Retaining Wall System Build-Up
- 1 Concrete Substrate
- 2 Crack Repair (if required)
- 3 ACTFLEX MS PRO
- 4 ACTFLEX AT MESH
- 5 ACTFLEX 988 CWP (2 Coats)
- 6 Protection Board (Optional)
- 7 Drainage System
- 8 Backfill
Tank System Build-Up
- 1 Concrete Substrate
- 2 Crack Repair (if required)
- 3 ACTFLEX FLEXPLUS
- 4 ACTFLEX AT MESH
- 5 ACTFLEX 988 WMP (2 Coats)
- 6 Protective Coating (Optional)
- 7 Water
Technical overview
Key applications
- Structural crack injection, sealing and restoring the structural integrity of fine to medium cracks in reinforced concrete
- Restoration of load-bearing capacity where cracks compromise the structural performance of slabs, beams and columns
- External steel plate bonding for structural strengthening
- Floor lifting and delamination repair, re-bonding lifted concrete surfaces and detached floor toppings
- Sealing cracks to prevent ingress of moisture, chlorides and other corrosive agents and protect embedded reinforcement
- Bridges, tunnels and civil infrastructure in high-load, high-stress environments
- Industrial flooring and warehouse slabs, injecting cracks in high-traffic areas to arrest progression of damage
- Precast, tilt-up and in-situ concrete elements requiring structural crack rectification
Surface suitability
- Concrete (clean, sound and free from contaminants; dry or at most slightly damp, never active running water)
- Reinforced concrete slabs, beams and columns where cracks compromise structural performance
- Precast, tilt-up and in-situ concrete elements requiring structural crack rectification
- Industrial flooring and warehouse slabs in high-traffic areas
- Bridges, tunnels and civil infrastructure in high-load, high-stress environments
NEVER inject into an active leak or a crack carrying running water. Epoxy will not displace water and will not cure against it. Stop the flow with ACTFLEX HYDROPLUG, or use ACTFLEX PU200 hydrophobic injection resin where the crack itself is carrying water. Cracks finer than 0.1 mm are outside the range of this resin, specify CRACKLOCK E400L. Not a flexible repair: the cured resin is rigid and structural and will not accommodate ongoing movement, so live and moving cracks must be assessed by an engineer and treated as movement joints, not injected. Never inject into a designed movement or expansion joint. Do not use for structural void filling. Do not exceed 2.5 MPa (25 bar) injection pressure, because excessive pressure widens the crack, causes blowouts and can damage the element. Apply only between 10C and 30C ambient and substrate, as viscosity rises sharply at low temperature and penetration is reduced. Do not dilute or thin. The substrate must be clean, sound and free from contaminants. Structural adequacy is not established by the TDS: the rectification design and the reinstatement of load capacity are the responsibility of the project engineer. Hardened epoxy will permanently block the injection machine, hoses and mixing nozzle, so flush immediately after use.
Technical Specifications
| Product Type | Two-component, solvent-free, low-viscosity structural epoxy injection resin |
| Mix Ratio | Resin : Hardener = 2 : 1 by weight |
| Packaging | 15 kg set (steel pail), Resin 10 kg + Hardener 5 kg |
| Colour (Part A resin) | Transparent |
| Colour (Part B hardener) | Light yellow, transparent |
| Appearance (mixed) | Transparent to light yellow |
| Viscosity (mixed, at 25C) | 500-800 cps (Brookfield) |
| Density (mixed) | 1.06-1.10 g/cm3 |
| Compressive Strength | Greater than 80 MPa (ASTM D695)* |
| Tensile Strength | Greater than 25 MPa (ASTM D638)* |
| Flexural Strength | Greater than 45 MPa (ASTM D790)* |
| Shrinkage on Cure | Nil* |
| Crack Width Range | 0.1-1.0 mm |
| Pot Life | Approx. 35 minutes @ 25C, 50% RH* |
| Gel Time | 150-180 seconds @ 100C (laboratory reactivity test, not a site condition) |
| Injection Pressure, hairline cracks | 0.5-1.0 MPa (5-10 bar) |
| Injection Pressure, deeper or wider cracks | Up to 2.5 MPa (25 bar) |
| Packer Spacing | 200-300 mm along the crack |
| Initial Set Within the Crack | 6-8 hours @ 25C, 50% RH |
| Cure Before Traffic or Load | 18 hours @ 25C, 50% RH* |
| Full Cure and Full Mechanical Strength | 7 days @ 25C, 50% RH |
| Substrate Condition | Dry or slightly damp. Never active running water |
| Application Temperature | 10-30C ambient and substrate |
| Storage | 10-25C, original unopened containers, tightly sealed |
| Shelf Life | 12 months unopened, stored as specified |
| * Typical Forspec R&D characteristic values determined at 25C and 50% RH. No accredited certificate is currently held for ACTFLEX ER300 | |
Real Projects. Real Results.
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Before
After
Pool Renovation
Gold Coast, QLD
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Before
After
Below Ground Retaining Wall
Sydney, NSW
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Before
After
Concrete Water Tank
Perth, WA
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After
Commercial Podium
Melbourne, VIC
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Before After
Swimming Pool Construction
Brisbane, QLD
Watch the install
Step-by-step from prep to top coat. Filmed on the tools, not in a studio.
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Frequently asked questions
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What is ACTFLEX ER300 used for?
CompatibilityER300 is a low-viscosity 2-component epoxy crack injection resin for pressure injection of fine-to-medium structural cracks in concrete - slabs, beams, columns, bridges, tunnels, and industrial floors.
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What crack range does it handle?
PerformanceER300's low viscosity penetrates cracks from 0.1mm to 1.0mm wide - the fine structural crack range that thicker epoxies can't fill. Deep penetration ensures full crack volume is welded back together.
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How is it applied?
InstallationApply via the INJEXA SWM injection pump through 10mm or 13mm packers spaced 100-150mm along the crack. Two-component mix, solvent-free. Permanent moisture and chloride barrier once cured.
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Is it suitable for structural strengthening?
CompatibilityYes. ER300 is suitable for steel-plate bonding and structural strengthening applications - the cured epoxy provides high compressive, tensile, and flexural strength that restores concrete integrity.
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Chemical and rebar protection?
PerformanceER300 is chemical resistant and provides permanent moisture/chloride barrier protection for embedded reinforcing steel. Critical for marine, coastal, and de-icing-salt environments where rebar corrosion is a concern.